Journal ArticleDOI
High performance optical absorbance detectors based on low noise switched integrators.
TLDR
Using circuitry based on newly available switched integrator integrated circuit (IC) packages, it is possible to construct inexpensive absorbance detectors with p-p noise levels as low as 3 microAU under actual use conditions.About:
This article is published in Talanta.The article was published on 1993-09-01. It has received 35 citations till now. The article focuses on the topics: Absorbance & Noise (electronics).read more
Citations
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Journal ArticleDOI
Light emitting diode-based detectors: Absorbance, fluorescence and spectroelectrochemical measurements in a planar flow-through cell
TL;DR: A review of analytical use of LEDs that has been advanced in the last decade is presented in this article, where LED-based absorbance measurement and its use in pedagogy, titrations, in providing immunity to refractive index and turbidity effects, in field and process analysis, in capillary electrophoresis, in liquid-liquid extraction systems, in film and drop-based analytical systems and with liquid core waveguides (LCWs) are discussed.
Journal ArticleDOI
Liquid Droplet. A Renewable Gas Sampling Interface
TL;DR: In this paper, the authors describe the coupling of this sampling interface with a sequential analysis system, and demonstrate its applicability for the measurement of parts-per-billion levels of gaseous NH 3, and a characterization of the performance of this experimental arrangement.
Journal ArticleDOI
Absorbance Based Light Emitting Diode Optical Sensors and Sensing Devices.
Martina O’Toole,Dermot Diamond +1 more
TL;DR: This paper summarises the development and advancement of LED based chemical sensors and sensing devices in terms of their configuration and application, with the focus on transmittance and reflectance absorptiometric measurements.
Journal ArticleDOI
Analytical chemistry in a liquid film/droplet
TL;DR: In this paper, the measurement of nitrogen dioxide at the parts-perbillion level is described, where two optical fibers placed on opposite sides of and in contact with a liquid film (14-57 μL in volume) supported on a U-shaped wire guide and two tubular conduits.
Journal ArticleDOI
A multi-wavelength photometer based on light-emitting diodes
TL;DR: An inexpensive and compact multi-wavelength photometer covering the visible range is obtained, which in many cases can replace a conventional spectrophotometer for absorbance measurements.
References
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PatentDOI
Rectangular capillaries for capillary electrophoresis
TL;DR: In this paper, an elongated or rectangular cross-section capillary is disclosed for use in capillary electrophoresis using optical detection, where flat walls produce less optical distortion than circular capillary walls.
Journal ArticleDOI
Light emitting diode based flow-through optical absorption detectors
Purnendu K. Dasgupta,Harvey S. Bellamy,Hanghui Liu,Jorge L. Lopez,Ellis L. Loree,Kavin A. Morris,Kaj Petersen,Kalam A. Mir +7 more
TL;DR: High performance, fully referenced, computer interfaced detectors are described that are pulsed at high speeds to attain measurement standard deviations in the range of 2-3 x 10(-6) absorbance.
Journal ArticleDOI
Thermal Lens Detection for Liquid Chromatography
Journal ArticleDOI
Universal sandwich membrane cell and detector for optical flow injection analysis
TL;DR: In this paper, a flow cell is used for spectrophotometric detection, chemiluminescence, gas diffusion, membrane separation, and their combinations have been successfully performed in a Flow cell, which combines fiber optics, flow channels, spacers, reflecting surfaces, and separation membranes into a robust sandwich type sensing unit.
Journal ArticleDOI
Ultratrace photometric determination of phosphate with a solid-state emitter as light source
TL;DR: The stability of the output power of a solid-state emitter (814 nm) is so great when operated from two 15-V batteries that an absorption photometer equipped with this emitter as light source can be used to measure absorbances down to 15 × 10 −4.