Showing papers on "Colorimeter published in 2014"

Mobile-platform based colorimeter for monitoring chlorine concentration in water

Abstract: Cost-effective monitoring concentration of residue chlorine in water can be simply accomplished via colorimetry where the selected indicating chemical material reacts with the chlorine in water to change its color. To suppress errors from reading the color level by naked eyes and from fluctuation of environmental illumination, this paper proposes a mobile-platform based colorimeter embedded with a self-referencing analysis for converting the color level of water to its corresponding chlorine concentration. The key idea relies on a two-dimensional (2D) color analysis in a portable closed chamber. Specifically, our 2D color analysis with self referencing is performed via the arrangement of both the reference material and the glass bottle in such a way that they both fit in the field of view of the mobile-device's camera. In this way, one color image inherently contains two image regions, one from the reference material and another from the glass bottle. Consequently, a specific color ratio from these two image regions is used for specifically converting the water color inside the glass bottle into its corresponding chlorine concentration. By using a chemical reaction between o -tolidine solution and chlorine dissolved in water and a smart mobile phone, the demonstration shows a very promising result in determining 0.06–2.0 ppm chlorine concentration in water. Other key features include cost effectiveness, compactness, portability, and ease of implementation.

A Simple, Small-Scale Lego Colorimeter with a Light-Emitting Diode (LED) Used as Detector

Abstract: This article describes how to construct a simple, inexpensive, and robust colorimeter from a few Lego bricks, in which one light-emitting diode (LED) is used as a light source and a second LED as a light detector. The colorimeter is suited to various grades and curricula.

From Voltage to Absorbance and Chemical Kinetics Using a Homemade Colorimeter

Abstract: The use of the Beer–Lambert law in spectroscopy is the core of standard methods for determining a chromophore concentration in a solution. Its application requires an understanding about interaction of light with a colored solution and the use of light emission and light detection devices. We build here a simple electronic circuit formed of light-emitting diodes and light-dependent resistors that can be used for measuring chromophore concentrations during experiments focused on chemical kinetics: decolorizing of phenolphthalein in a basic solution, and reduction of methylene blue by ascorbic acid. From the chemical point of view, the goal is to determine experimentally the rate law. In addition, students understand, using inexpensive electronics, the basic design of a spectrophotometer to achieve successful measurements of absorbance.

Integral Measurements of the Color of Nanodimensional Radiators

Abstract: The use of an integral colorimeter of heightened sensitivity constructed with the use of a physiological colorimetric system is considered. The color characteristics of the radiation of low-dimension sources with absolute error in the determination of the chromaticity coordinates 0.002 units may be measured by the new colorimeter.

Image forming apparatus and colorimetric apparatus

Abstract: When a colorimeter is colorimetrically measuring a test pattern, a control unit controls a motor such that the colorimeter and a facing member are closer to each other. A recording material on which the test pattern has been formed is brought into contact with the colorimeter. Even when the colorimeter is not colorimetrically measuring the test pattern, the control unit controls the motor such that the colorimeter and the facing member are closer to each other. The recording material on which the test pattern has been formed is brought into contact with the colorimeter.

Colorimeter, image processor, and colorimetric method

Abstract: PROBLEM TO BE SOLVED: To provide a colorimeter and a colorimetric method for shortening a measurement time while maintaining measurement accuracy by using a spectrometer, and an image processor provided with the colorimeter.SOLUTION: The colorimeter selects the wavelength of light to be measured by a spectroscopic sensor part 140 on the basis of information showing spectral characteristic when a color patch image is outputted by the image processor on the basis of color patch image information, determines a measurement time of the selected wavelength of each light, and sets the wavelength of the light and the measurement time as measurement conditions.

Image forming apparatus and colorimetric device

Abstract: PROBLEM TO BE SOLVED: To provide a multicolor image forming apparatus capable of more reducing the contamination of a colorimeter than heretofore.SOLUTION: An image formation control part 56 controls a cam driving motor, so that a colorimeter 10 and a counter member are brought closer, to bring a recording material P on which a test pattern is formed into contact with the colorimeter 10, when the colorimeter 10 executes the colorimetry of the test pattern. Further, the image formation control part 56 controls the cam driving motor, so that the colorimeter 10 and the counter member are brought closer, to bring the recording material P on which the test pattern is formed into contact with the colorimeter 10, when a predetermined contact condition is satisfied, even when the colorimeter 10 does not execute the colorimetry of the test pattern. Since a chance for cleaning the colorimetric window part of the colorimeter 10 by the recording material P is increased, the contamination of the colorimetric window part of the colorimeter 10 can be reduced.

Colorimeter calibration system and methods

Abstract: A toy playset with a colorimeter and method of calibration is provided. The colorimeter may include the combination of a microcontroller with multiple switchable output ports, a light source connected to three of the output ports, and a photo transistor for sensing reflected light. The colorimeter may include four different resistors, each of the resistors connected to a corresponding additional one of the output ports, with the four different resistors connected in parallel to the photo transistor. The colorimeter may be programmed to cycle through the resistors and select a calibration based on a low predefined voltage target for reflection from a black surface and a higher predefined voltage target for reflection from a white surface. The light source is a RGB light source having a tri-band wavelength light.

Image processing apparatus, image processing method, and recording medium storing image processing program

Abstract: An image processing apparatus, an image processing method, and an image processing program stored in a recording medium are provided. The image processing apparatus includes a processing circuitry, and the processing circuitry and the image processing method obtain a color image output from an image forming unit, predict an output color of the image forming unit to generate a predicted color specification value independent from the image forming unit, extract from the input image data a colorimetry area for color difference determination, obtain a colorimetric value of an area of the color image that corresponds to the extracted colorimetry area, using a colorimeter, and add a colorimetric error at the colorimeter due to a color arrangement on the input image data to the predicted color specification value, to obtain a corrected colorimetric value of the area of the color image.

Development of Embedded System BasedColorimeter for the Analysis of Copper inWaste Water

Abstract: An embedded system based colorimeter has been developed for the analysis of copper in waste water. The design is based on the ARM-7 LPC-2148 processor. The data convertor section of the processor is interfaced to the photoelectric sensor of the colorimeter. The inbuilt DAC is used for the control of intensity of incident light produced by light source. The monochromatic colored LEDs are used as source of stable light. Similarly the inbuilt ADC is used to measure the potential corresponding to the transmitted light. The transmitted light is detected and converted into potential by the LDR circuit. The instrumental and the experimental errors introduced due to the absorption by cuvette and the reagent respectively were compensated by the software techniques. In addition to above functions, the software performs the operations of calculation of absorptivity coefficient, detection and estimation of concentration of copper. The developed equipment has been successfully used for the analysis of copper in waste water. The software program can be easily modified for the similar study of other analytes.

Colorimetric light energy spectrum measuring instrument for colorimeter

Abstract: The utility model discloses a colorimetric light energy spectrum measuring instrument for a colorimeter The colorimetric light energy spectrum measuring instrument comprises a light processing device and a calculating device, wherein the light processing device comprises a lighting probe and a CCD spectrometer; the lighting probe comprises a shell body, the lower end of the side wall of the shell body is provided with a lighting opening, the bottom part of the shell body is provided with a concave reflector at a position corresponding to the lighting opening, the top part of the shell body is provided with an optical fiber lighting head, and the optical fiber lighting head is connected with the CCD spectrometer through an optical fiber; the calculating device is a computer or a tablet computer; and the CCD spectrometer is connected with the computer The colorimetric light energy spectrum measuring instrument for the colorimeter has the advantages of being capable of determining whether colorimetric light of the colorimeter conforms to requirements of relate indexes, improving measurement accuracy of the colorimeter, being easy in operation and the like

Integral colorimeter based on compound LED illumination

Abstract: Traditional integral colorimeters use tungsten-halogen or xenon lamps for illumination, as well as correcting filters to make the instrument's spectral response meet the Luther condition. This structure causes the instruments to have relatively higher error and poor repeatability. Thus, this letter proposes a new measurement design that uses compound LEDs as the instrument's measurement light source. The new design adjusts the instrument's spectral response by modifying the spectra of the compound LEDs. A compound LED light source is designed for integral colorimeters, and an experiment is conducted to evaluate the performance of the integral colorimeter. Experiments show that the design effectively reduces the error of integral colorimeters.

Method for extending the dynamic range of absorbance deterctors

Abstract: The invention generally provides methods for improving the dynamic range of an absorbance detector and absorbance detectors having improved dynamic range. In an exemplary embodiment, the method includes receiving calibration data for a plurality of samples, the calibration data comprising an absorbance for a concentration of each of the samples, calculating a contribution of stray light to the calibration data, and correcting subsequent data by removing the contribution of stray light.

Illumination device for color vision deficient persons

Abstract: PROBLEM TO BE SOLVED: To provide an illumination device for color vision deficient persons capable of corresponding to an individual difference or an ambient environment change.SOLUTION: An illumination device 1 comprises: a light source including a plurality of kinds of LED elements 5 having different emission wavelength ranges; a spectral colorimeter 8 for measuring a wavelength intensity distribution of external light; a memory 10 for storing a plurality of basic spectrum patterns of the light source 4; a changeover switch 7 for receiving a result that a user selects one of the plurality of basic spectrum patterns; a CPU 11 which executes correction processing for correcting the basic spectrum pattern selected by the user on the basis of the wavelength intensity distribution of the external light measured by the spectral colorimeter 8; and a lighting control circuit 12 capable of individually controlling emission intensities of the plurality of kinds of LED elements 5 on the basis of the corrected basic spectrum pattern.

Method for evaluating browning degrees of Chinese chestnuts by using colorimeter

Abstract: The invention belongs to the technical field of food detection, and discloses a method for evaluating the browning degrees of Chinese chestnuts by using a colorimeter. The method comprises the following steps: (1) sample preparation, namely selecting more than two varieties of Chinese chestnuts, cutting the Chinese chestnuts by virtue of a sharp knife, and peeling off episperm and endopleura, so as to obtain a sample to be detected; (2) colorimeter determination, namely selecting a diffuse reflection D65 light source, determining the sample to be detected, and recording data Delta Eab, Delta L, Delta a and Delta b; and (3) analyzing the data Delta L, and evaluating different browning degrees of the Chinese chestnuts by using the Delta L. According to the method, the browning degrees of the Chinese chestnuts are detected by taking the precision colorimeter as a tool; the numerical values Delta L which reflect the browning degrees of the surfaces of the cooked Chinese chestnuts can be quickly read by using the colorimeter; not only can subjective evaluation be avoided, but also further oxidative browning, which is caused in a long-term grinding process, can be avoided, the time for evaluating the browning degrees of Chinese chestnut kernels can be significantly shortened by virtue of the colorimeter, and concrete data for evaluating the browning degrees can be quickly obtained.

Two-dimensional sequential type colorimeter detection method and colorimeter

Abstract: Disclosed is a two-dimensional sequential type colorimeter detection method. The method is used for analyzing the color of the surface of at least one object to be detected and converting into chroma. A colorimeter comprises a synthesized light source used for irradiating the surface of the object to be detected, an image taking device, a control and calculus outputting device and a storing device; the synthesized light source comprises a plurality of LED with the different central wavelengths located in the visible light range, the surface of the object to be detected is arranged in a predetermined region to be detected, the region to be detected is divided into a plurality of positions to be detected, and the storing device stores the whole compensation data of reflections of the positions to be detected to the LED and responses of the image taking device to the central wavelengths.

Integral colorimeter based on compound LED illumination

Abstract: Traditional integral colorimeters use tungsten–halogen or xenon lamps for illumination,as well as correcting filters to make the instrument’s spectral response meet the Luther condition.This structure causes the instruments to have relatively higher error and poor repeatability.Thus,this letter proposes a new measurement design that uses compound LEDs as the instrument’s measurement light source.The new design adjusts the instrument’s spectral response by modifying the spectra of the compound LEDs.A compound LED light source is designed for integral colorimeters,and an experiment is conducted to evaluate the performance of the integral colorimeter.Experiments show that the design effectively reduces the error of integral colorimeters.

Method for acquiring color data measured from display device

Abstract: Disclosed is a method for collecting color data measured from a display device. A method for collecting data to measure a color expressed in the display device using a sensing device includes the steps of: (a) synchronizing driving of the display device with the operation of the sensing device; (b) acquiring a plurality of data related to colors expressed on the display device by actuating the sensing device; (c) arranging the data according to a first reference; and (d) selecting data serving as data for color measurement of the display device and selected from among a plurality of data according to a second reference. When the color of the image display device is measured using a tri-stimulus colorimeter, even if the oscillation shape and the period of a square wave of a black light unit (BLU) of the display device are changed, the deviation of the collected color measurement data can be minimized, so that colors can be exactly measured and XYZ values can be calculated.

Multicolor light source experimental device applied to photoelectric colorimeter

Abstract: The utility model provides a multicolor light source experimental device applied to a photoelectric colorimeter. The multicolor light source experimental device is characterized in that a red LED light source, a green LED light source and a blue LED light source are arranged in a shading box, light emitted by the light sources can be coupled into light guiding fibers, and outlets of the light guiding fibers are provided with a beam expanding lens and a collimating lens. Eight colored light output control buttons are arranged on a power source controller, according to the three-primary color mixing principle, when one certain control button is pressed down, the power source controller controls the red LED light source, the green LED light source and the blue LED light source to emit colored light in the corresponding proportion, the colored light are mixed in the light guiding fibers, and the colored light in the corresponding colors is output to serve as an incidence light source of the photoelectric colorimeter. By means of the multicolor light source experimental device, the red LED light source, the green LED light source and the blue LED light source serve as three-primary-color light sources, various kinds of colored light can be obtained, the complementation colored light can be provided for solutions in various colors to serve as incidence light, and the measuring accuracy is improved. In addition, LEDs serve as the light sources, the heating amount is less, the stability is high, the service life is long, and luminance adjustment in the PWM mode is accurate and convenient to achieve.

Colorimeter cell rack of purple spectrometer

Abstract: The utility model discloses a colorimeter cell rack of a purple spectrometer. The colorimeter cell rack comprises a base, a round supporting plate and a plurality of colorimeter cell clamping seats, wherein the colorimeter cell clamping seats are rectangular and a clamping groove for holding a colorimeter cell is formed in the middle of each colorimeter cell clamping seat; corresponding light-passing holes are formed in the two opposite side walls of the colorimeter cell clamping seat; the colorimeter cell clamping seats are uniformly and detachably mounted on the round supporting plate in the circumferential direction of the round supporting plate; the round supporting plate is mounted on the base through a rotary shaft and a micro drive motor is arranged at the bottom of the base; the output end of the drive motor is connected with the rotary shaft. According to the colorimeter cell rack provided by the utility model, the sample introduction and monitoring operations are simultaneously carried out, the transmission is stable, the measurement is accurate, and the number of colorimeter cell clamping seats is adjustable, so that the problems of instable transmission structure and low adaptability of an existing colorimeter cell rack of a purple spectrometer are solved.

Colorimeter and signal reception device thereof

Abstract: The utility model discloses a signal reception device of a colorimeter. The signal reception device is used for detecting paper samples. The signal reception device comprises three groups of signal reception components. Each signal reception component comprises an optical filter used for filtration of light reflected by a paper sample and a photocell used for converting the light signal going through the above optical filter into an electric signal. In the three groups of signal reception components, the colors of the optical filters are red, blue and green. The signal reception device has three groups of signal reception components, and can obtain three stimulation values of the light reflected by the paper sample at the same time. A filter rotary table is saved, operation of repeated rotation of the above filter rotary table is avoided, and usage of a user is convenient. The utility model also discloses a colorimeter. The colorimeter is applied on the above signal reception device, and has characteristics of simple operation and convenient usage for a user.

Optical path automatic correction colorimeter

Abstract: The utility model discloses an optical path automatic correction colorimeter. The colorimeter comprises a luminescence light source, a colorimetric ware, an opposite-irradiation light receiver and a data processor. A light signal sent by the luminescence light source is output to a receiving end of the opposite-irradiation light receiver via the colorimetric ware; an output end of the opposite-irradiation light receiver is in communication connection with an input end of the data processor; the colorimeter also comprises a compensation light receiver directly receiving the light signal sent by the luminescence light source; the compensation light receiver comprises a vertical type silicon photocell and a two-stage amplifier; and the vertical type silicon photocell and the two-stage amplifier are connected in series and then connected with the data processor. According to the utility model, precision and accuracy of measurement are improved, attenuation of emitted light is prevented, and automatic correction for the luminescence light source is achieved.

Image processing apparatus, method, and recording medium storing image processing program for gradation correction to minimize the difference between the corrected colorimetric value and a colorimetric measured color value

Abstract: An image processing apparatus, an image processing method, and an image processing program stored in a recording medium are provided. The image processing apparatus includes a processing circuitry, and the processing circuitry and the image processing method obtain a color image output from an image forming unit, predict an output color of the image forming unit to generate a predicted color specification value independent from the image forming unit, extract from the input image data a colorimetry area for color difference determination, obtain a colorimetric value of an area of the color image that corresponds to the extracted colorimetry area, using a colorimeter, and add a colorimetric error at the colorimeter due to a color arrangement on the input image data to the predicted color specification value, to obtain a corrected colorimetric value of the area of the color image.

Development of Embedded System Based Colorimeter for the Analysis of Copper in Waste Water

Abstract: 2 ABSTRACT:An embedded system based colorimeter has been developed for the analysis of copper in waste water. The design is based on the ARM-7 LPC-2148 processor. The data convertor section of the processor is interfaced to the photoelectric sensor of the colorimeter. The inbuilt DAC is used for the control of intensity of incident light produced by light source. The monochromatic colored LEDs are used as source of stable light. Similarly the inbuilt ADC is used to measure the potential corresponding to the transmitted light. The transmitted light is detected and converted into potential by the LDR circuit. The instrumental and the experimental errors introduced due to the absorption by cuvette and the reagent respectively were compensated by the software techniques. In addition to above functions, the software performs the operations of calculation of absorptivity coefficient, detection and estimation of concentration of copper. The developed equipment has been successfully used for the analysis of copper in waste water. The software program can be easily modified for the similar study of other analytes.

Color correction apparatus, image forming system, and non-transitory computer readable medium

Abstract: A color correction apparatus includes a memory and a display controller. The memory stores, for each of colorimeters that subjects a color chart output by an image forming apparatus to colorimetry, definition information in which a type of correction of color characteristics that the colorimeter is capable of performing has been defined in advance. The display controller performs control such that, for each of the colorimeters, the type of correction of color characteristics that the colorimeter is capable of performing is displayed on a display on the basis of the definition information stored in the memory.

37.4: Improved Display Color Measurements with the WP214 Imaging Spectral Colorimeter

Abstract: An innovative imaging colorimeter measurement system which corrects tristimulus images by referencing an integrated spot spectroradiometer is introduced. Improvements offered to the display test industry by the new measurement system over current colorimeter designs are verified by measurements with comparable instruments and the analysis of a modern mobile display.

Colorimeter measurement method and colorimeter for implementing the method

Abstract: The present application relates to a colorimeter measurement method and a colorimeter for implementing the method. The method includes the following steps: placing a measured sample on a sample platform; shooting a current image of the sample; determining an intersection angle θ between the sample and a moving direction of the sample platform; adjusting a position of a scanning light spot of a colorimeter according to the angle θ, so that the sample coincides with the moving direction of the sample platform; using the colorimeter to scan the measured sample. By implementing the colorimeter measurement method and the colorimeter of the present application, the sample can be placed optionally when it is measured. Specially, when a design value of a measured sample is approximately equal to a size of the measuring light spot, much time can be saved and manpower waste is avoided.

Study on Influence Factor of Filter-type LED Chroma Correction Accuracy

Abstract: With the development of LED industry, chroma correction is becoming more and more attention, the most important thing is to get highest precise chroma value. Based on principle colorimeter can divided into spectroradiometer spectrophotometer and Tristimulus values colorimeter. The tristimulus filter-type colorimeters are the most widely used for imaging applications. Many studies have been conducted on how to calibrate tristimulus filter-type colorimeters, but the results are alwaysstrongly related to the calibration conditions and the target stimulus, system stability and repeatability is insufficient. In this paper we show how filters influenced filter-type colorimeters accuracy and analyze the error of RGB color industrial camera pixel-level correction.