Optical fiber evanescent wave form quartz enhanced photoacoustic spectrum sensor and gas measurement method

A photoacoustic spectroscopy and sensor technology, applied in the field of laser sensors, can solve problems such as high price and achieve the effects of improving stability, small size and low insertion loss

Inactive Publication Date: 2015-04-29
HARBIN INST OF TECH
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Problems solved by technology

But this type of sensor requires expensive photodetectors or spectrometers

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  • Optical fiber evanescent wave form quartz enhanced photoacoustic spectrum sensor and gas measurement method

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[0017] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0018] Such as figure 1 As shown, the optical fiber evanescent quartz-enhanced photoacoustic spectrum sensor provided by the present invention is composed of a semiconductor laser source 1, a front single-mode fiber 2, a tapered fiber 3, a quartz tuning fork 4, and a rear single-mode fiber 6. The semiconductor laser The source 1, the front single-mode fiber 2, the tapered fiber 3, and the rear single-mode fiber 6 are sequentially arranged along the beam propagation direction, and the tapered fiber 3 passes through the prongs of the quartz tuning fork 4....

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Abstract

The invention discloses an optical fiber evanescent wave form quartz enhanced photoacoustic spectrum sensor and a gas measurement method. The sensor is composed of a semiconductor laser source, a front single-mode optical fiber, a tapered optical fiber, a quartz tuning fork and a rear single-mode optical fiber, wherein the semiconductor laser source, the front single-mode optical fiber, the tapered optical fiber and the rear single-mode optical fiber are arranged in sequence along a light beam transmission direction; and the tapered optical fiber penetrates through a fork leg of the quartz tuning fork. Semiconductor laser is transmitted to the tapered optical fiber through the front single-mode optical fiber, and an evanescent wave field with strong energy is generated on the tapered optical fiber; gas to be detected absorbs the energy of the evanescent wave field to generate sound waves; and the quartz tuning fork receives a sound wave signal to invert gas concentration. The novel full-optical-fiber evanescent wave form quartz enhanced photoacoustic spectrum sensor is constructed aiming at sensing detection of trace gas; and compared with a traditional lens transmission system, the optical fiber evanescent wave form quartz enhanced photoacoustic spectrum sensor has the extremely low insertion loss, the stability of a sensor system is extremely improved, the structure is simple and the volume is small.

Description

technical field [0001] The invention belongs to the field of laser sensors, and relates to an all-fiber evanescent wave quartz-enhanced photoacoustic spectrum trace gas sensor and a gas measurement method. Background technique [0002] Trace gas sensor technology can detect the composition and concentration of gas, and has important applications in the fields of atmospheric chemistry, combustion and medicine. Quartz-enhanced photoacoustic spectroscopy gas sensor is a common gas sensor. In the quartz-enhanced photoacoustic spectroscopy gas sensor, the spatial transmission (collimation, transmission and focusing) of the laser beam is one of the difficulties in this technology, and it also affects One of the important factors of probing system performance. [0003] Optical fiber evanescent wave gas sensor is also a widely used gas sensor technology. When light is transmitted in the optical fiber, it will produce total reflection on the interface between the two media. From t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17G01N21/25
Inventor 马欲飞于欣于光张静波李旭东彭江波闫仁鹏樊荣伟陈德应杨超波杨振
Owner HARBIN INST OF TECH
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