Multiple light source addressed potential sensor and parallelly processing gas image test set

A potential sensor, parallel processing technology, applied in the direction of electrochemical variables of materials, etc., can solve the problem of low detection speed, and achieve the effect of parallel processing and fast processing

Inactive Publication Date: 2003-08-13
ZHEJIANG UNIV
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Problems solved by technology

[0007] The main problem of the current detection device is the low detection speed, especially in the case where there are many components of the gas to be detected, a variety of metal sensitive films are fixed, and the image resolution is high. This is because scanning an image point by point Image, is a serial processing method
This limits the application of current detection devices in occasions requiring rapid detection, such as real-time and dynamic image detection of gases, etc.

Method used

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  • Multiple light source addressed potential sensor and parallelly processing gas image test set
  • Multiple light source addressed potential sensor and parallelly processing gas image test set
  • Multiple light source addressed potential sensor and parallelly processing gas image test set

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Embodiment Construction

[0025] Multiple light sources with the same wavelength and different modulation frequencies are used to excite the sensor at the same time, that is, each light source addresses different sensor areas at the same time, so it is called MLAPS (Multi-light Addressable Potentiometric Sensors). On this basis, the parallel processing technology is used to realize the rapid image detection of the measured gas. For this purpose, a series of theoretical and detection technical problems must be solved, because the sensor only produces photoelectric effect for light with a certain wavelength or certain excitation energy, and Under the excitation of light with a certain excitation wavelength, the frequency of its response photocurrent is the same as the modulation frequency of the excitation light source. However, the frequency response characteristics of the LAPS sensor to the excitation light source have a certain range. Generally, the frequency of an excitation light corresponding to th...

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Abstract

In the test set, a signal source with n channel signal generators and drive circuits drive n scan light sources to stimulate LAPS simultaneously, a digital compensating filter corrects the frequency response of the sensor to make it have the same S / N ratio and detection accuracy to the signals produced by the stimulating multiple light sources. By means of computerized fast Fourier transform, the responses of the sensors of different frequency to tested gases are calculated parallely. By means of two-dimensional drive circuit, the response image to tested gases is obtained. The set has the advantages of fast and parallel treatment.

Description

technical field [0001] The invention relates to a gas image testing device. Background technique [0002] The full name of LAPS is Light Addressable Potentiometric Sensors (Light Addressable Potentiometric Sensors), which was invented by the American Molecular Devices Company in 1988. In 1991, Sweden's I. Lundstrom et al. used LAPS to develop a gas image sensor for the first time, that is, LAPS with MIS (metal / insulator / semiconductor) structure. [0003] LAPS uses intensity modulation, that is, light of a certain modulation frequency is irradiated on the front or back of the device, and the current can be measured in the external circuit. The magnitude of the current is related to the light intensity, the thickness of the depletion layer (that is, the external bias voltage) and so on. [0004] When the light intensity is constant, the photocurrent increases with the thickening of the depletion layer. That is to say, with the increase of the appli...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
Inventor 王平张钦涛
Owner ZHEJIANG UNIV
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