Showing papers on "Colorimeter published in 2017"

The Evaluation of a Low-Cost Colorimeter for Glucose Detection in Salivary Samples

Abstract: Given the limited access to healthcare resources, low-income settings require the development of affordable technology. Here we present the design and evaluation of a low-cost colorimeter applied to the non-invasive monitoring of Diabetes Mellitus through the detection of glucose in salival fluid. Samples were processed by the glucose oxidase-peroxidase enzymatic system and analyzed with the development equipment. A light emission diode of 532.5 nm was used as an excitation source and a RGB module was used as a receptor. A calibration curve to quantify the concentration of salivary glucose (0 to 18 mg/dL) was carried out by relating the RGB components registered with glucose concentrations, achieving a limit of detection of 0.17 mg/dL with a CV of 5% (n = 3). Salivary samples of diabetic and healthy volunteers were processed with the equipment showing an average concentration of 1.5519 ± 0.4511 mg/dL for the first and 4.0479 ± 1.6103 mg/dL for the last, allowing a discrimination between both groups. Results were validated against a UV-Vis-NIR spectrophotometer with a correspondence of R2 of 0.98194 between both instruments. Results suggest the potential application of the developed device to the sensitive detection of relevant analytes with a low-cost, user-friendly, low-power and portable instrumentation.

Green Determination of Total Iron in Water by Digital Image Colorimetry

Abstract: A green iOS digital image colorimeter was fabricated for the determination of total iron in natural water. A mobile application operating on an iOS device was designed using Euclidean distance theo...

Measuring color hue in ‘sunrise solo’ papaya using a flatbed scanner

Abstract: color hue is a variable frequently used postharvest to assess the physiological maturity of various fruits. In general, mean color hue is quantified by visual techniques, but this method, based on human grading, is tedious and may be erroneous. The color of fruit peel is frequently determined at four points randomly distributed on the equatorial region of a fruit, but this practice can lead to biased results because these points represent the equatorial region only and not the total area of the fruit peel. consequently, this bias is not due to equipment measurement errors, but to the bias in the sampling process of the points on the fruit epidermis. an alternative to such methods is the digital image which provides information about all regions of the fruit peel, and results in a more accurate mean hue. however, this technique requires calibration to correct the values of luminance, hue and intensity obtained through the scanner. This calibration can be performed from color patterns such that each pattern is assessed by means of a scanner and a colorimeter. Thus, an experiment was conducted using 297 color patterns based on the munssel color chart for plant tissue. The results showed that the scanner could be used as a device for color assessment where the determination coefficients were above 0.9 for all color components. Next, a second experiment was conducted in order to compare the scanner and colorimeter methodologies. For this, we used a papaya fruit, cv. Sunrise Solo, which was assessed by these two devices for a period of 19 days. The results showed that the image analysis measures have a different mean hue when compared with the mean hue obtained by the method using a colorimeter. Therefore, it is recommended that digital image analysis be used for the evaluation of the hue of fruit peel color when fruit presents non-uniform coloration.

Image forming apparatus, non-transitory computer-readable storage medium storing color-conversion control program, and color-conversion control method

Abstract: An image forming apparatus includes a printing unit, an in-line colorimeter and an in-line scanner. A hardware processor is configured to control the printing unit, the in-line colorimeter and the in-line scanner, to perform the following operations. The hardware processor uses the printing unit to print a first color chart to be measured with the in-line scanner and an external colorimeter, and a second color chart to be measured with the in-line scanner and the in-line colorimeter. A hardware processor creates a scanner profile based on RGB values and colorimetric values of patches of the second size in the second area in the first color chart, and uses RGB values and colorimetric values of patches of the first size in the first area in each of the first and second color charts, to calculates correction amounts for use in estimation of colorimetric values by using the scanner profile.

On-site Determination of Trace Arsenic by Reflection-Absorption Colorimetry of Molybdenum Blue Collected on a Membrane Filter.

Abstract: An on-site determination method for trace arsenic has been developed by collecting it as molybdenum blue (MB) in the presence of tetradecyldimethylbenzylammonium chloride on a mixed cellulose ester membrane filter and by measuring reflection absorbance (RA) of MB on the filter using a laboratory-made palm-top size reflection-absorbance colorimeter with a red light-emitting diode. The value of RA was proportional to the amount of arsenic up to 0.5 μg with a detection limit of 0.01 μg. The proposed method was successfully applied to soil extract and hot-spring water samples.

Objective Measurement of Hypertrophic Scars using Skin Colorimeter.

Abstract: The paper deals with the methodology of the scars pigmentation objective assessment and their time evaluation on the base acquired data with the skin colorimeter prototype DSC1 (Detection of Scar Color). The analysis is primarily focused on the hypertrophic scars pigmentation assessment after heeling of deep burns which often exhibit the pigmentation. In the process of the scars evaluation in some patients it goes to the spontaneous pigmentation changes. If the pigmentation changes long-term persist and patient requires corrections, various treatment methods can influence these pigmentation changes (for instance the laser therapy and others). In the context of the complex development evaluation and in the process of the scars treatment, these changes are commonly observable well but their quantification is usually difficult, therefore using of the objective methods is desirable. The particular kind of such objective method is the skin colorimeter. The technical concept and testing of the skin colorimeter prototype DSC1 is presented in this

Colorimeter based on color sensor

Abstract: In this paper colorimeter based on color sensor is considered. The developed colorimeter experimental utilization is shown on example of detection Cu2+, Co2+ ions and Neutral Red indicator. Realized measurement optical system in the colorimeter supports operation with different types of sorbents, as possibility is shown an operation with silica, polyurethane foam and the indicator paper. Dynamic range of device at 12 bit per channel and well stability of characteristic are enough to work with fine reliability that is no more 0.7% for analyzed test systems. Streszczenie. W artykule przedstawiono kolorymetr zbudowany z wykorzystaniem czujnika barwy. Przedstawiono wykorzystanie przedstawionego kolorymetry na przykładzie detekcji jonów Cu, Co i neutralnego wskaźnika barwy czerwonej. Zrealizowany system optyczny kolorymetru umożliwia pracę z różnymi rodzajami sorbentów. Możliwości te pokazano z wykorzystaniem krzemionki, pianki poliuretanowej i papierka wskaźnikowego. (Kolorymetr zbudowany z wykorzystaniem czujnika koloru).

Aqueous sample fluid measurement and analysis

Abstract: An embodiment provides a method for determining a concentration of an analyte in a fluid sample, including: introducing a fluid sample into a measurement chamber; operating a measurement device to introduce light of a first wavelength to the fluid sample; measuring, with a detector, absorbance of the light of the first wavelength with respect to the fluid sample; operating the measurement device to introduce light of a second wavelength to the fluid sample; measuring, with the detector, absorbance of the light of the second wavelength with respect to the fluid sample; determining, using a processor of the measurement device, an absorbance ratio of the fluid sample using both the measured absorbance of the light of the first wavelength and the measured absorbance of the light of the second wavelength; and providing, via an output device, a determined concentration value for the fluid sample that correlates to the absorbance ratio. Other aspects are described and claimed.

Photometer-colorimeter based on integrating sphere with an internal screen and optoelectronic RGB-components

Abstract: Subject of Research. The paper presents the laboratory colorimeter for determination of color parameters of objects with a diffuse reflection. We discuss design features, performance and metrological characteristics, calibration algorithm of the device in XYZ and RGB color systems. Findings for color parameters of aesthetic dentistry materials are given. Methods. The light-emitting diode and the RGB-photodiode were first used as an emitter and a photodetector in the colorimeter design. The integrating sphere with an internal baffle was also applied. Illumination distribution numerical modeling in the sphere with ФОТОМЕТР-КОЛОРИМЕТР НА ОСНОВЕ ИНТЕГРИРУЮЩЕЙ СФЕРЫ... Научно-технический вестник информационных технологий, механики и оптики, 2017, том 17, No 2 250 the internal baffle located near its center was carried out. Test samples of nanocomposites diffuse reflectors for aesthetic dentistry were examined. Main Results. The precision of measurements of color parameters determined with the use of photometer-colorimeter and the ones determined from reflection spectra within the reflection index range equal to 4–90 % was no worse than ∆X, Y, Z = 0.2. Thus, the presented colorimeter responses to the practical exploitation of the colorimetry. Practical Relevance. The presented device is being tested in Pavlov First Saint Petersburg State Medical University.

A design of colorimeter for chemical quantitative analysis based on a web-camera

Abstract: This paper presents the design of colorimeter for chemical quantitative analysis based on image processing. It comprises of two main parts which are test box and software. The test box consists of a web camera and LED lamp plat which is used to illuminate a micro wells. The software is graphic user interface and image processing. The main of image processing are split RGB channel of each pit in micro wells so calculate calibration curves for finding and unknown concentric solution then show result on screen. The experiment shows the design in this paper can calculate concentric of the solution. The result of the experiment have a correlation of reaction between Fe (II) and Phenanthroline (Red product) 0.985, the reaction between Ethanol and Methyl orange (Yellow product) 0.933 and reaction between Uric acid and Phosphotungstic acid (Blue product) 0.986. Moreover it takes a less time and lower cast compared with the spectrophotometer. The device can be applied to chemical laboratory by possibility.

Photoelectric-colorimetry-method-based online detection device for nitrogen-phosphorus-potassium-water-fertilizer nutrient concentrations

Abstract: The invention discloses a photoelectric-colorimetry-method-based online detection device for nitrogen-phosphorus-potassium-water-fertilizer nutrient concentrations. A to-be-detected liquid inlet, a detection valve and a flow meter are sequentially arranged on a liquid feeding pipe, and to-be-detected liquid is injected into a glass colorimeter pool through the pipe; a clear water valve, a purified water valve and color reagent injection valves are correspondingly arranged on a clear water tank, a purified water tank and color reagent tanks respectively, and under the effect of an injection pump, some valve is opened, and liquid corresponding to a liquid storage tank is injected into the glass colorimeter pool; a point light source, a three-channel rotating filter lens and a light-sensitive cell are arranged on the same line, light emitted by the point light source is illuminated on the glass colorimeter pool through the three-channel rotating filter lens, light penetrating through the glass colorimeter pool is illuminated on the light-sensitive cell, and the concentrations of to-be-detected ions in the to-be-detected liquid are calculated through a single-chip-microcomputer circuit system according to voltage change of the light-sensitive cell. The online detection device has the advantage that the concentrations of all the nutrients in nitrogen-phosphorus-potassium water fertilizer can be rapidly, accurately and efficiently detected.

Method for identifying quality of gardenia based on colorimeter method

Abstract: The invention discloses a method for identifying the quality of gardenia based on a colorimeter method. The method comprises the steps of (S1) collecting different batches of gardenia processed products and screening the gardenia processed products meeting the standard; (S2) collecting a color characteristic parameter L*a*b* value by using a colorimeter; (S3) determining a color parameter value range of a gardenia processed product group; (S4) carrying out discriminant analysis on color data; (S5) collecting color characteristic parameters of the gardenia processed products which are not used for modeling and the gardenia processed products which do not meet the standard and verifying the reference value range; and (S6) detecting the samples. According to the method, the color reference value range of the gardenia quality is determined by using the colorimeter method for the first time, and the gardenia quality is objectively evaluated. Compared with traditional experimental differentiation, the method is simple and fast, the quality of the traditional Chinese medicines is evaluated objectively, quantifiably and digitally. A novel identification method is provided for evaluation of the gardenia quality, and a scientific basis is provided for the quality supervision of the gardenia processed products in the market.

Brightness colorimeter having measurement error caused by linearly polarized light, which is corrected

Abstract: A brightness colorimeter having a measurement error caused by linearly polarized light, which is corrected, includes: a lens module to which light irradiated from one side is input; a polarization conversion module configured to penetrate the light input through the lens module to convert polarization characteristics; a spectral module provided in one unit block to reflect and penetrate the light input through the polarization conversion module so as to branch the light in different three directions; filter modules arranged on progress paths of the light branched in different three direction through the spectral module to penetrate monochromatic light beams having specific spectra among the light branched in the three directions; and measurement modules arranged to correspond to exit angles of the monochromatic light beams penetrated through the filter modules, to measure at least one of a brightness, a colorimeter and a defect obtained by the monochromatic light beams.

Colorimetry apparatus and colorimetry method based on digital oral cavity observer

Abstract: The present invention discloses a colorimetry apparatus and a colorimetry method based on a digital oral cavity observer. The digital oral cavity observer comprises a handle, a frame fixation device and a display device, wherein a camera system for collecting images or video is arranged on the handle, the handle, the frame fixation device and the display device are sequentially connected, the frame fixation device comprises a central processing device and a colorimetry control device, the central processing device is used for colorimetry, the colorimetry control device is used for controlling the central processing device to perform colorimetry, and the handle and the frame fixation device transmit data through a high speed signal conversion unit. According to the present invention, the central processing device in the frame fixation device of the existing digital oral cavity observer is used to perform the colorimetry, such that the low accuracy rate caused by the subjective judgment of the physician is avoided, the arrangement of the dedicated computer colorimeter is not required, and the cost is reduced.

Image Forming Apparatus, Image Forming Method and Computer Readable Medium

Abstract: An image forming apparatus includes a sheet feeder, a sheet conveyor, an image former, a fixer, a colorimeter and a processor. The fixer fixes an image formed on a sheet by the image former. The colorimeter is provided on a down-stream side than the fixer in a sheet conveying direction and reads the image. The processor calibrates the colorimeter based on the image read by the colorimeter. When an image for calibration which is formed in advance on a color sample housed in the sheet feeder is made to be read by the colorimeter, the processor controls at least one of the sheet conveyor, the image former and the fixer according to a condition for controlling deterioration of the color sample which is different from a condition of when carrying out an image forming.

Reader device, read control method, and read control program

Abstract: PROBLEM TO BE SOLVED: To provide a reader device and a control method with which it is possible to appropriately read a plurality of colorimetric patches without the need for enlargement.SOLUTION: The reader device comprises: a colorimeter 190b for reading a colorimetric patch formed on paper; a trigger sensor 190a for reading a trigger patch formed on paper; and a control unit 101 for controlling a read area in which the colorimeter reads the colorimetric patch on the basis of the trigger patch read by the trigger sensor, the reader device having a colorimetry area determination mode for determining a read area in which the colorimeter reads the colorimetric patch on the basis of the result of reading the trigger patch, and a colorimetry adjustment mode for exercising control so that the colorimeter reads the read area determined in the colorimetry area determination mode. In the colorimetry area determination mode, the colorimetric patch read area is set to a state in which it is gradually changed in correspondence to each trigger patch read result, the results of colorimetric patch read by the colorimeter are collected, and an area the state of which matches the characteristic of colorimetric patches as the result of reading is determined as a read area.SELECTED DRAWING: Figure 1

Coloured polymer molded article, method and device for molded article making

Abstract: FIELD: manufacturing technology.SUBSTANCE: invention relates to method of producing film (12), containing following stages: (a) polymer material (10) plasticizing and mixing with one or more dyes with production of moulding compound (11, 11') by means of gelatinization device (2) made with dyes metering device (6); (b) optionally temporary storage of moulding compound (11') produced at stage (a); (c) molding compound (11') loading into molding device (4) and (d) producing film (12); wherein amount of dye to amount of polymer material (10) ratio is automatically controlled by means of colorimeter (7) and electronic control unit (14), and at stage (a) moulding compound (11) located in gelatinization device (2) colour parameters are measured, and transmitted in form of signal to electronic control unit (14), at stage (d) in film (12) by means of additional colorimeter (8) additional colour parameters are measured and transmitted as signal to electronic control unit (14). Invention also relates to device (1) containing gelatinization device (2) made with metering device (6) for one or more dyes and intended for polymer material (10) plastification and mixing with dye to produce moulding compound (11, 11'); colorimeter (7); connected to metering device (6) and to electronic control unit (14) colorimeter (7), intended for automatic control of dye and polymer material (10) amounts ratio; and moulding device (4) for production of film (12), wherein colorimeter (7) is capable of detecting electromagnetic radiation emitted by moulding compound (11) located in gelatinization device (2), wherein device (1) contains additional colorimeter (8), which is connected with electronic control unit (14) and which is capable of detecting electromagnetic radiation emitted by film (12).EFFECT: disclosed is film producing method.16 cl, 3 dwg

Brightness colorimeter with corrected measurement error caused by linearly polarized light

Abstract: PROBLEM TO BE SOLVED: To provide a brightness colorimeter with a corrected measurement error caused by linearly polarized light.SOLUTION: The brightness colorimeter with a corrected measurement error caused by linearly polarized light includes: a lens module 100 on which light to be irradiated from one side is made incident; a polarization conversion module 200 which transmits the light made incident through the lens module to convert polarization characteristics; a spectral module 400 which is constituted in one unit block, reflects and transmits the light made incident via the polarization conversion module to be spectrally branched in three different directions, respectively; filter modules 500 which are arranged on an advance course of each light to be spectrally branched in the three different directions, through the spectral module, to transmit only monochromic light containing a specific spectrum to each light to be spectrally branched in the three directions; and measurement modules 600 which are arranged to correspond to an exit angle of each monochromic light transmitted through the filter module, and configured to be able to measure at least one of brightness, chromaticity and defects to be obtained by each monochromic light.SELECTED DRAWING: Figure 2

Method and apparatus for color correction of digital camera image

Abstract: The invention relates to a method for color correction of an image of a subject (1) taken with a digital camera using a colorimeter (2) for spectral measurement. According to the invention, the color measuring device (2) is a portable device for illumination-independent local spectral measurement, which is substantially smaller than the motif (1). The color measuring device (2) is placed at a selected location of the subject (1) which has a hue darker than a gray tone typically used for white balance and a measurement is made. A reference image of the subject (1) is recorded with the digital camera while the color measuring device (2) is placed on the selected location of the subject (1), and the color correction is performed using the color measurement value measured by the color measuring device (2) selected body.

Color measuring device, image forming apparatus, image forming system, and image formation management device

Abstract: PROBLEM TO BE SOLVED: To make it possible to easily and accurately determine a color boundary in an image the color of which is to be measured without increasing the size of the imageSOLUTION: A color measuring device comprises: a conveyance part that conveys a transfer medium; a colorimeter that measures a color of an image formed on the transfer medium and having a color boundary in a conveyance direction; and a color measurement control part that controls the conveyance part and colorimeter The color measurement control part acquires color information on the color boundary in the image and determines the color boundary in the image on the basis of the color information and a result of color measurement from the colorimeterSELECTED DRAWING: Figure 5

IMAGE FORMING APPARATUS, and COLOR-CONVERSION CONTROL METHOD

Abstract: An image forming apparatus includes a printing unit, an in-line colorimeter and an in-line scanner A hardware processor is configured to control the printing unit, the in-line colorimeter and the in-line scanner, to perform the following operations The hardware processor uses the printing unit to print a first color chart to be measured with the in-line scanner and an external colorimeter, and a second color chart to be measured with the in-line scanner and the in-line colorimeter A hardware processor creates a scanner profile based on RGB values and colorimetric values of patches of the second size in the second area in the first color chart, and uses RGB values and colorimetric values of patches of the first size in the first area in each of the first and second color charts, to calculates correction amounts for use in estimation of colorimetric values by using the scanner profile