Semiconductor ozone sensor measuring circuit

Abstract

The invention discloses a semiconductor ozone sensor measuring circuit. The semiconductor ozone sensor measuring circuit is characterized by being composed of a singlechip control circuit (1), a measuring electrode current source circuit (2), a measuring electrode voltage measuring circuit (3), a semiconductor ozone sensor (4) and a heating electrode supply circuit (5), wherein the input end of the measuring electrode current source circuit (2) is connected with a digital analog converter (DAC) port of the singlechip control circuit (1), and the output end of the singlechip control circuit (1) is connected with pins 1 and 3 of a measuring electrode (4a) of the semiconductor ozone sensor (4); and the measuring electrode voltage measuring circuit (3) is connected with the pins 1 and 3 of the measuring electrode (4a) of the semiconductor ozone sensor (4), and the output end of the measuring electrode voltage measuring circuit (3) is connected with an analog-digital converter (ADC) port. The semiconductor ozone sensor measuring circuit provided by the invention has the beneficial effects that the constant current power supply of the measuring electrode of the semiconductor ozone sensor is realized, the measuring electrode of the sensor operates under the stable current, and the digitization quantitative detection of the semiconductor ozone sensor is realized.

Description

[0001] technical field [0002] The invention relates to a semiconductor ozone sensor measuring circuit for measuring the ozone concentration in the air. Background technique [0003] Ozone is a strong oxidant with good sterilization and disinfection functions. It can diffuse to any corner of the space to kill viruses without leaving residues and avoiding secondary pollution. It has been widely used in air purification, water treatment, Food processing, medical treatment, medicine, aquaculture and other fields. However, ozone is irritating to the mucous membrane of the human respiratory tract. If the concentration of ozone in the air is too high, it can cause rapid pulse, fatigue, headache, and emphysema and even death in severe cases. Therefore, when using ozone for air purification and disinfection, its concentration must be strictly detected and controlled. [0004] At present, there are chemical methods and ultraviolet absorption methods for measuring ozone concentrati...

AI Technical Summary

Problems solved by technology

Since the resistance value of the sensor measuring electrode changes greatly in the presence of ozone and without ozone, the current of the series circuit is also unstable, resulting in unstable operating current of the ozone sensor, inaccurate measurement results, and even ozone concentration in practical applications. The higher the value, the measurement result of the measurement electrode resistance changes in the opposite direction to the reaction direction, and the measurement repeatability is poor, making it difficult to achieve quantitative measurement

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