Device and method for measuring smoke particulate matter and oxygen gas concentration through single-light-beam laser

Abstract

The invention discloses a device and method for measuring smoke particulate matter and oxygen gas concentration through single-light-beam laser and relates to the technical field of environmental protection. The device comprises a first signal generator, a second signal generator, a laser device, a beam splitter, a first detector, an angled reflecting mirror, a second detector, a phase-locking amplifier and a signal acquisition and processing module. The laser device outputs and transmits laser to the detectors after modulation, the detectors receive the laser and transmit electrical signals to the phase-locking amplifier, and the phase-locking amplifier transmits modulated secondary harmonic signals to the signal acquisition and processing module. The device utilizes non-absorbing-sectionsine wave signal intensity information to measure particulate matter concentration, utilizes scanned non-absorbing-section sine wave signal intensity information to eliminate the influence of light intensity change caused by particulate matter on concentration measurement, and meanwhile measures smoke particulate matter and gas concentration through the single-light-beam laser, the detection process is shortened, and the industrial cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a device and a method for measuring the concentration of flue gas particles and oxygen gas with a single-beam laser. Background technique [0002] With the rapid development of my country's industry, the particulate matter and flue gas pollutants discharged by industries such as thermal power plants, cement plants, industrial boilers and heating boilers have caused serious pollution to the natural environment, which is the main factor causing environmental pollution. Want to monitor The total amount of industrial waste gas and particulate matter emissions must be continuously monitored. [0003] The traditional monitoring of industrial exhaust gas and particulate matter uses independent monitoring instruments to measure industrial exhaust gas and particulate matter, which increases industrial costs. [0004] Moreover, when measuring the flue gas conce...

AI Technical Summary

Problems solved by technology

[0003] The traditional monitoring of industrial exhaust gas and particulate matter uses independent monitoring instruments to measure industrial exhaust gas and particulate matter, which increases industrial costs

[0004] Moreover, when measuring the flue gas concentration, due to the existence of flue gas particles, the intensity of the laser passing through the flue gas fluctuates, and the demodulated second harmonic signal is proportional to the light intensity. Therefore, to accurately measure the concentration of gas in the flue gas, it is necessary to To eliminate the influence of light intensity fluctuations, the current international method of eliminating the influence of light intensity mainly uses the ratio of the residual amplitude of the second harmonic signal to the first harmonic signal to eliminate it. Since the second harmonic signal and the first harmonic signal are demodulated using different The lock-in amplifier, the phase and other information of the two lock-in amplifiers are not consistent, and the distance of the remote sensing detection technology changes in practical applications, which will cause a certain change in the phase, which will cause the use of the second harmonic signal There is a large error in the ratio of the residual amplitude of the first harmonic signal to eliminate the influence of light intensity fluctuations

Images