A hydrogen sulfide detection device and method

Abstract

The invention provides a hydrogen sulfide detection device and method which are used for improving the detection sensitivity and the response speed of the detection device. The hydrogen sulfide detection method comprises the steps that firstly, outside a to-be-detected environment, a power supply, a field-effect tube type sensor connected with a resistor and a signal conditioning unit are used forobtaining a digital voltage initial value signal, and the digital voltage initial value signal is stored by a controller; secondly, in the to-be-detected environment, the power supply, the field-effect tube type sensor connected with the resistor and the signal conditioning unit are used for obtaining a digital voltage signal, and the digital voltage signal is output; thirdly, the controller calculates the hydrogen sulfide concentration by utilizing the digital voltage initial value signal, the digital voltage signal, the temperature of the to-be-detected environment and the pressure intensity; finally, the controller judges whether the hydrogen sulfide concentration is smaller than a reference concentration or not, if yes, the controller controls a displayer to display the hydrogen sulfide concentration, otherwise, the controller controls the display to display the hydrogen sulfide concentration and controls an alarm device to give an alarm at the same time. The device is relativelyhigh in sensitivity and relatively high in response speed and can be used for detecting the concentration of hydrogen sulfide gas.

Description

technical field [0001] The invention belongs to the technical field of electronic measurement, and relates to a hydrogen sulfide detection device and method, which can be used for detection of hydrogen sulfide gas concentration. Background technique [0002] Hydrogen sulfide is a colorless and flammable acid gas, which has serious harm to the human body. It can destroy hemoglobin and inhibit the olfactory nerve. The acceptable concentration for general healthy people is 20 to 100 ppb, and once it exceeds 250 ppm, it will be fatal. At present, various factories such as kraft pulp mills, oil refineries, pharmaceutical factories, sewage treatment plants, and man-made fiber factories emit hydrogen sulfide gas, making hydrogen sulfide gas a common air pollutant. [0003] At present, hydrogen sulfide gas detection devices can be divided into: spectral type, electrochemical type and semiconductor resistance type according to the type of sensor used. Among them, the spectral formu...

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Problems solved by technology

However, because the hydrogen sulfide sensor of the invention uses a metal electrode wrapped with a doped tin dioxide film, the doped tin dioxide film has a weak adsorption capacity for hydrogen sulfide gas. At the same time, this sensor structure makes the doped tin dioxide film The surface area of ​​the tin film exposed to the environment is small, resulting in low sensitivity of the hydrogen sulfide detection device; and the carrier mobility inside the doped tin dioxide film is low, resulting in the transfer of charges between it and hydrogen sulfide molecules The rate is low, which in turn causes the response speed of the hydrogen sulfide detection device to be low

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