Gas sensor comprehensive tester and measurement method thereof
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A technology of gas sensor and comprehensive tester, which can be used in measurement devices, instruments, scientific instruments, etc., and can solve the problems of complex gas sensor test systems.
Inactive Publication Date: 2016-06-08
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[0004] The purpose of the present invention is to provide a gas sensor comprehensive tester, which integrates the power supply circuit, temperature control system and data acquisition part of the gas sensor test syste
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Embodiment 1
[0024] In this embodiment, the gas sensor comprehensive tester works independently and is not connected with an external computer. Use resistive semiconductor hydrogen sulfide sensor as test object, to gather the given resistance R of described sampling resistor 5 s The output voltage signal V at both ends s way to measure.
[0025] This example figure 2 As shown, the measurement method needs to be supplied with a working voltage V by the adjustable DC working power supply 6-1 in the DC power supply 6. c , according to the principle of resistance voltage division, the internal resistance R of the sensor and the output voltage V at both ends of the sampling resistance s There are the following relations:
[0026] R=(V c -V s ) R s / V s (1)
[0027] The response of the hydrogen sulfide sensor to hydrogen sulfide gas is defined as
[0028] S=V sH2S / V sair (2)
[0029] In the formula, S is the response of hydrogen sulfide sensor to hydrogen sulfide gas, V sair is t...
Embodiment 2
[0046] In this embodiment, the gas sensor comprehensive tester works in cooperation with an external computer, uses a resistive semiconductor ammonia sensor as a test object, and collects characteristic data of the ammonia sensor by directly measuring the internal resistance of the gas sensor.
[0047] In this embodiment, the response of the ammonia sensor to ammonia is defined as
[0048] S=R air / R NH3 (3)
[0049] In the formula, S is the response of the ammonia sensor to ammonia, R air is the internal resistance of the sensor in air, R NH3 is the internal resistance of the sensor in ammonia gas.
[0050] The specific method and operation steps of this embodiment are as follows.
[0051] 1. Install the ammonia sensor 1 to be tested in the sensor device in the test chamber, close the test chamber, and connect the gas distribution system.
[0052] 2. Press image 3 As shown, an external computer is connected to the gas sensor comprehensive tester through a USB interfac...
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Abstract
The present invention discloses a gas sensor comprehensive tester and a measurement method thereof. The gas sensor comprehensive tester comprises a multi-channel digital display direct current stabilized voltage power supply, a digital display temperature controller, an adjustable sampling resistor, a data acquisition circuit, a data storage unit, a data display device and a USB interface. According to the present invention, the gas sensor comprehensive tester can completely meet various requirements during the testing of the gas sensor, wherein the requirements comprise: providing a direct current working power supply and a heating power supply for the sensor, measuring and controlling the working temperature of the sensor, measuring the characteristic data of the sensor, displaying and storing the tested data, and performing the on-line working with the computer, and the user can select the testing scheme according to the use conditions and the working way of the sensor based on the requirement so as to achieve the evaluation on the characteristic of the sensor; and the gas sensor comprehensive tester is suitable for the performance testing on the resistor type gas sensor, the MOS diode type gas sensor, the junction diode type gas sensor, the field effect transistor type gas sensor, the galvanic cell type gas sensor, the controlled potential electrolysis type gas sensor, the electric quantity type gas sensor and the ion electrode type gas sensor, and has advantages of gas sensor development cost reducing and research and development efficiency improving.
Description
technical field [0001] The invention relates to a gas sensor testing technology, in particular to a gas sensor comprehensive tester, the invention is suitable for resistance type, MOS diode type, junction diode type, field effect tube type, primary battery type, controllable potential electrolysis type Performance test and evaluation of gas sensors such as electric quantity type and ion electrode type. Background technique [0002] A gas sensor is a device that converts information about gas species and its concentration into electrical signals. According to the strength of these electrical signals, information related to the existence of the gas to be measured in the environment can be obtained, so that detection, monitoring and alarm can be carried out. It can also form an automatic detection, control and alarm system through the interface circuit and computer. At present, the chemically-based gas sensors developed and popular in the market are roughly divided into four ...
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IPC IPC(8): G01N33/00G01N27/00
Inventor 傅铁祥
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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