Sealing adjusting mirror bracket for cavity enhanced spectrum instrument

Abstract

The invention relates to a sealing adjusting mirror bracket for a cavity enhanced spectrum instrument. The sealing adjusting mirror bracket is provided with a lens fixed on a lens fixing seat and a bellows lock collar fixed below the lens fixing seat, two sides of the lens are respectively provided with an O-shaped gasket for air tightness, and the upper end face of the bellows and the lower end of the lens fixing seat are connected through a sealing ring in a sealing mode. The sealing adjusting mirror bracket improves lens installation stability and lens direction adjustability, ensures optical cavity operation reliability and the cavity air tightness to adapt to low pressure measurement. A sweeping gas inlet is arranged in the inner side of the lens and clings to the lens. The direction of the lens is adjusted by means of two screw pairs, and the direction of the lens can be adjusted precisely. The sealing adjusting mirror bracket has the advantages of being simple in structure, low in price, capable of being used for laboratory scientific research and especially suitable for an application of an optical cavity enhancement technology.

Description

technical field [0001] The invention relates to a device for measuring components in the atmosphere by using broadband cavity enhanced absorption spectroscopy technology, in particular to a mirror frame in a broadband cavity enhanced absorption spectroscopy instrument. Background technique [0002] Broadband cavity-enhanced absorption spectroscopy technology is a technology used to detect and measure trace components in ambient air (see patent publication number CN 101281124A). Some components in the air have an obvious characteristic absorption at one or several specific wavelengths. Using this characteristic, the substance to be measured can be distinguished from other substances. The greater the concentration of the substance to be measured, the more absorption, and this feature can be used to obtain the concentration of the substance to be measured. For particulate matter, an inversion program is also required to calculate the particle size. It is worth mentioning that...

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Problems solved by technology

[0004] The existing mirror frames can only adjust the direction, but in the actual atmospheric observation, it is not only necessary to adjust the direction, but also to ensure the airtightness of the cavity; and the operating time of the instrument is relatively long, generally it needs to be guaranteed for about one month. Calibration period, since the cavity-enhanced instrument samples directly from the atmosphere during operation, it is inevitable that some particles or other pollutants will enter the cavity. Long-term operation will inevitably cause the cavity mirror to be polluted, which will affect the accuracy of the measurement.

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