Device and method for utilizing photoinduced ultrasonic method to detect concentration of acetylene gas

Abstract

The invention discloses a device and method for utilizing a light-induced ultrasonic method to detect the concentration of acetylene gas. The device comprises a nanosecond impulse DFB laser, a collimating mirror, a signal generator, a controller, a long optical distance absorbing photoacoustic cell, an ultrasonic wave detector, a temperature sensor, a pressure sensor, a lock-in amplifier, a data acquisition card and a computer. Based on the device, rapid, accurate, high sensitivity and high resolution non-contact measurement of the concentration of acetylene gas can be achieved, and occurrenceof the death accident caused by poisoning of acetylene gas can be effectively avoided. Influences of environmental factors to the gas detection can be effectively reduced by utilizing temperature andpressure to conduct monitoring value correction on the concentration, and the measuring accuracy of the system is greatly improved. The gas concentration is detected by utilizing ultrasonic imaging,interference of other gas ingredients and the environmental noise can be reduced, the detection speed is higher, and the sensitivity is higher.

Description

technical field [0001] The invention belongs to the technical field of trace gas detection, and relates to a device and method for rapidly and accurately detecting the concentration of acetylene gas, in particular to a device and method for detecting trace acetylene gas by using a photo-induced ultrasonic method. Background technique [0002] Acetylene gas has important applications in metal cutting and welding, and it is also an important organic raw material. However, acetylene gas is colorless, flammable and explosive. When the concentration of acetylene gas in the air reaches 2.3-72.3%, it is very easy to cause an explosion accident. Therefore, accurate and real-time detection of the concentration of acetylene gas in industrial sites is of great significance to ensure the safety of production and workers. At the same time, the quality of fruits can be judged by measuring the concentration of acetylene gas volatilized by strawberries and raspberries. [0003] Gas concent...

AI Technical Summary

Problems solved by technology

Due to the need to sample the gas to be measured, the non-spectral method has a long response time and cannot be monitored in real time. At the same time, it is greatly affected by the external environment. Factors such as temperature, pressure, vibration, etc. have a greater impact on the measurement results, especially when the gas concentration distribution is uneven. , the error of the measurement result is very large. When dealing with the actual industrial and agricultural field environment, the manufacturing and maintenance costs of the equipment are very high, the cost performance is low, and the concentration measurement of most gases cannot be achieved.

Images