Laser multiple reflection photoacoustic spectroscopy technology-based aerosol optical absorption coefficient detection apparatus

Abstract

The invention provides a laser multiple reflection photoacoustic spectroscopy technology-based aerosol optical absorption coefficient detection apparatus. Laser passes through an optical isolator and an optoacoustic cell and is reflected by a first reflector, reflected laser passes through the optoacoustic cell and the optical isolator and is reflected by a second reflector, newly obtained reflected laser passes through the optical isolator and the optoacoustic cell and is reflected by the first reflector, the reflected laser passes through the optoacoustic cell and the optical isolator and then is output, a lock-in amplifier is connected with a microphone and a signal generator, and an optoacoustic signal is extracted from noises and is counted by a computer to obtain the absorption coefficient of aerosol. A technical problem that the influences of insufficient utilization of laser power on the detection precision of photoacoustic spectroscopy technology-based aerosol optical absorption coefficient detection apparatuses in the prior art is solved in the invention. Multiple reflection of the laser is carried out in the optoacoustic cell, so the laser power in the optoacoustic cell is improved without improving the laser output power; and the sensitivity of the amplitude enhancement detection apparatus of the optoacoustic signal is improved.

Description

technical field [0001] The invention relates to an environment and meteorological observation device, in particular to an aerosol optical absorption coefficient detection device of photoacoustic spectrum technology. Background technique [0002] Aerosols have a extinction effect that absorbs and scatters sunlight, resulting in less sunlight reaching the ground, thereby lowering the temperature of the atmosphere and affecting the global climate. Aerosols will reduce the visibility of the atmosphere and directly affect the safety of transportation. At the same time, the absorption coefficient of the aerosol is closely related to the concentration of black carbon, and the composition of the aerosol can be studied through the absorption coefficient of the aerosol. Therefore, it is of great significance to study the aerosol optical absorption coefficient detection device. [0003] At present, the absorption coefficient of aerosol is usually measured by black carbon meter, and t...

AI Technical Summary

Problems solved by technology

However, the laser only passes through the photoacoustic cell once, and the laser power is not fully utilized. The amplitude of the photoacoustic signal is low, and the measurement sensitivity of the detection device is not high, which affects the detection accuracy.

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