Minim moisture detection system based on scanning method

Abstract

The invention discloses a minim moisture detection system based on a scanning method, and belongs to the technical field of gas detection. The minim moisture detection system comprises a temperature control circuit, a current driving circuit, a distributed feedback (DFB) laser, a sawtooth wave generation circuit, an air chamber, a 1*2 coupler, a photodetector, a data acquisition card and a computer. The system is characterized in that: an output terminal of the DFB laser is connected with the 1*2 coupler through pigtail; two beam paths are connected with the rear of the 1*2 coupler, wherein one beam path is the photodetector, the other beam path is a beam path for cascade connection of the air chamber and the photodetector; the output terminals of the photodetectors in the two beam paths are respectively connected to the data acquisition card; the output terminal of the data acquisition card is connected with the computer; the sawtooth wave generation circuit is connected with the current driving circuit and is connected with the DFB laser; the temperature control circuit is connected to the DFB laser. The system has advantages of resist radiation, corrosion proof, anti-electromagnetic interference, on-line monitoring, small volume of required gas, simple operation, short response time and high accuracy.

Description

technical field [0001] The invention relates to a gas detection system, in particular to a micro-water detection system based on a scanning method, which belongs to the technical field of gas detection. Background technique [0002] Water vapor exists in a variety of gases, such as air, natural gas, and oxygen. When we use these gases in a specific environment, we have stricter requirements on the concentration of water vapor in these gases. Excessive water vapor may endanger the safety of life and property: [0003] (1) Compressed air and gases used in patient care in the medical industry must be clean and sterilized. Monitoring the concentration indicators of major pollutants in the gas is of vital importance. If the concentration is not monitored, it will damage the health of the patient. These pollutants include carbon monoxide and carbon dioxide in the gas, nitrogen oxides, oil and moisture. In the case of water vapor, there are two phenomena that need to be treated...

AI Technical Summary

Problems solved by technology

One is the potential for condensation in the gas system, causing interference with water liquids in critical instruments, and potential corrosion of parts of the gas system

Second, harmful bacteria like to multiply in places with high humidity, and excessive water vapor condensation will promote the growth of bacteria, which will endanger patients breathing medical gases

Some of these measurement methods have relatively high requirements on environmental conditions, long measurement time, fear of pollution, etc. Some of them consume a lot of air during measurement, and the equipment needs to be powered on and ventilated before use, and the repeatability is poor.

Images