Ozone Tester Circuit Principle
Release time:
2022-05-26
The ozone tester adopts the principle of ultraviolet absorption method, uses a stable ultraviolet light source to generate ultraviolet light, uses a light filter to filter out other wavelengths of ultraviolet light, and only allows the wavelength of 253.7nm to pass. After passing through the sample photoelectric sensor, and then through the ozone absorption cell, it reaches the sampling photoelectric sensor. The ozone concentration can be obtained by comparing the electrical signals of the sample photoelectric sensor and the sampling photoelectric sensor, and then through the calculation of the mathematical model.
The ozone tester adopts the principle of ultraviolet absorption method, uses a stable ultraviolet light source to generate ultraviolet light, uses a light filter to filter out other wavelengths of ultraviolet light, and only allows the wavelength of 253.7nm to pass. After passing through the sample photoelectric sensor, and then through the ozone absorption cell, it reaches the sampling photoelectric sensor. The ozone concentration can be obtained by comparing the electrical signals of the sample photoelectric sensor and the sampling photoelectric sensor, and then through the calculation of the mathematical model.
The basic circuit consists of six parts: power supply, UV lamp control, UV sample detection, UV sample detection, logarithmic amplifier Log100, analog output and display.
The core part of the ozone tester circuit is to use the logarithmic amplifier Log100 to realize the mathematical model of ozone concentration. LOG100 is a 14-pin integrated circuit that can perform logarithmic operation on the ratio of two currents or voltages. The amplifier output current has a wide dynamic range and can vary from 1nA to 1mA. The output error range does not exceed 0.1%. Basic wiring, output formula: Vout =VT×ln I0/I (Note: VT---constant; Vout---output voltage).
The power supply part is mainly to generate the high-voltage power supply required by the ultraviolet lamp, and at the same time generate the +15V DC power required by the circuit board. The UV lamp control part mainly controls the current of the UV lamp within a constant allowable range. It can be adjusted automatically if it is too high or too low. If it cannot be adjusted, it means that the life of the UV lamp has expired, and a red light on the panel will turn on, indicating that you should replace it. New UV lamps are out. Standard UV light detection and sampling UV light detection are also more critical parts. The photoelectric sensor converts the UV light signal into a voltage signal, and then the signal is sorted and amplified by two operational amplifiers, and sent to LOG100 for calculation and processing, and the output is displayed. The analog output 0~20mA has a linear relationship with the ozone concentration.
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