Method and system for improving dynamic detection sensitivity of semiconductor resistance type gas-sensitive element

Abstract

The invention provides a method and a system for improving the dynamic detection sensitivity of a semiconductor resistance type gas-sensitive element. The system comprises a heating loop, a testing loop and a controller, wherein the heating loop consists of a direct-current voltage-stabilizing power supply and a heater; the testing loop is formed by connecting a direct-current voltage-stabilizing power supply of 0V to 10V, a semiconductor gas-sensitive element and load resistors; the voltages of two ends of each load resistor are connected with the controller through an acquisition circuit; the heater is controlled by the controller; the load resistors are adjustable resistors, and a resistance value is controlled and adjusted by the controller. The gas concentration is dynamically detected on the basis of the semiconductor gas-sensitive element which is output in a resistance form; under the action of certain gas concentration, the value of the load resistors is automatically adjusted along with the dynamic change of the value of output resistors of the semiconductor gas-sensitive element, and the output resistors of the semiconductor gas-sensitive element can be matched with the load resistors, so that the dynamic detection sensitivity is improved, the manual operation is reduced, the test time is shortened, the test accuracy is indirectly improved, and the aim of accurately monitoring the gas concentration in real time is achieved.

Description

technical field [0001] The invention belongs to the application field of testing technology, and in particular relates to a method for improving the dynamic detection sensitivity of a semiconductor resistive gas sensor and a detection system thereof. Background technique [0002] A semiconductor gas sensor is a chemical sensor sensitive to a certain gas, which can change the resistance of the sensitive film according to the concentration of the external gas or the type of gas. Due to its high sensitivity, uncomplicated manufacturing process, and convenient and flexible use, semiconductor resistive gas sensors have become the fastest growing and most widely used type of gas sensors among semiconductor resistive gas sensors. As far as the method of improving the sensitivity of semiconductor resistive gas sensor is concerned, the methods currently used are: (1) adding catalysts to improve the activity of gas-sensitive materials; (2) ultrafine materials; (3) finding new sensitiv...

AI Technical Summary

Problems solved by technology

The operation is cumbersome, the test time is long, and it is easy to cause the resistance value of the matching resistor to be too large or too small, resulting in low detection accuracy of the sampling voltage and difficult to observe

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