An automatic calibration device for a laser-type smoke extinction meter

Abstract

The invention provides an automatic calibration device for a laser type extinction smoke meter. The automatic calibration device mainly consists of a base (1), a support rod I (2), a support rod II (3), a plane mirror I (4), a plane mirror II (5), a cross rod (6), a motor I (7), a motor II (8), an extinction slide disc (9), an optical fiber passage (10), an optical fiber inlet joint (11), an optical fiber outlet joint (12) and a control unit (13), wherein the automatic calibration device is matched with the laser type extinction smoke meter consisting of a laser transmitter (14), a laser transmitter (15) and a detection chamber (16) for use; the plane mirror I (4) and the plane mirror II (5) are connected with the cross rod (6); the support rod I (2) and the support rod II (3) are connected with the cross rod (6) through top bearings; the motor I (7) and the motor II (8) are respectively connected with the cross rod (6) and the extinction slide disc (9). The problem of zero shift of the laser type extinction smoke meter can be solved in real time, so that the measurement accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of environmental detection instruments, and in particular relates to an automatic calibration device for a laser-type extinction smoke meter. Background technique [0002] At present, with the increasingly stringent emission regulations, the restrictions on diesel engine exhaust smoke and the requirements for measurement accuracy have also increased. The resolution of the traditional extinction smoke meter used for diesel engine exhaust smoke detection is 1 / 0.01m. Compared with the smoke value of exhaust gas under the national 4 level which is less than 1 / 0.lm, the measurement error exceeds 10%, and Traditional extinction-type opacimeters use white light as the detection light source. Due to the inconsistent scattering, diffraction, and absorption characteristics of different wavelengths of light, their accuracy and minimum resolution are greatly limited. An extinction-type opacimeter that uses a laser with...

AI Technical Summary

Problems solved by technology

The resolution of the traditional extinction smoke meter used for diesel engine exhaust smoke detection is 1 / 0.01m. Compared with the smoke value of exhaust gas under the national 4 level which is less than 1 / 0.lm, the measurement error exceeds 10%, and The traditional extinction-type opacimeter uses white light as the detection light source. Due to the inconsistent scattering, diffraction and absorption characteristics of different wavelengths of light, its accuracy and minimum resolution are greatly limited.

An extinction-type opacimeter that uses a laser with good monochromaticity as the light source can greatly improve the measurement accuracy under low-smoke conditions. However, during long-term use, due to the residual gas in the device and the aging of the laser source, it will cause The measurement accuracy of the laser-type opacimeter is reduced

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