Handheld Raman probe

Abstract

The invention relates to the spectral analysis technology, particularly to a handheld Raman probe, which includes a probe and a control circuit, wherein the probe includes optical fibers, a focusing mirror, a holographical narrow-band light filter, a beam dump, a collimating mirror, a sample window, a light deflector, a band-pass filter plate, a switch, a casing and a cable, wherein the optical fibers, the focusing mirror, the holographical narrow-band light filter, the beam dump, the collimating mirror and the sample window are placed in the casing as per the optical pass. The stability control of light sources as well as the automatic control of sampling in use are all taken into consideration, the feedback control is adopted for controlling the stability of light sources, and the sampling is controlled through the resistance bridge touch switch, so that the handheld Raman probe can be widely used for on-line monitoring and field sampling in the fields such as agriculture, food, petroleum industry and chemical engineering, has compact structure, low power consumption, and functions as stable control of light sources and automatic sampling, and is portable and suitable for on-line monitoring and field sampling.

Description

technical field [0001] The invention relates to spectrum analysis technology, in particular to a hand-held Raman probe. Background technique [0002] Raman scattering is a phenomenon of inelastic scattering of light and matter. It is an important spectral analysis technique because of its high sensitivity, fast, non-destructive, very few samples required, and microscopic light path can be used to detect and detect microscopic areas of samples. With the advantages of imaging detection, it has been widely used in the fields of solid state physics, semiconductor physics, catalysis, surface, biochemistry, material characterization and gemstone identification. [0003] As a sensor, the fiber optic probe has the advantages of shielding external stray light, reducing electromagnetic interference, fully gathering micro-area signals, and high sensitivity. It is suitable for non-contact detection such as long-distance remote control detection, high temperature and high pressure. The ...

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Problems solved by technology

[0005] Patent CN1278423A invented a single-emitting double-receiving probe for near-infrared optical medical imaging device; patent CN1457427A invented a probe for measuring light scattering, including light input optical fiber for light and scattered light measurement optical fiber for transmitting scattered light; patent CN1162440A invented a contact-type intracavity laser probe device; patent CN2546846Y invented a two-dimensional light transmission probe; patent CN2578823Y invented a probe including a shell, a probe, and double optical fibers; , output optical fiber into a probe with two bottom angles of 45° and a top angle of 90°; CN2248872Y invented a dual-channel photoelectric detection probe; patent CN2368096Y invented a fiber optic probe for smoke detection; patent CN201043948Y invented a An integrated probe for on-line gas analysis; however, among the optical fiber probes involved in the above patents, first: factors such as light source aging and voltage fluctuation are not considered, which will cause changes in the light intensity of the incident sample, which will affect the accuracy of the measurement results; Second: It can only simply control the switch of the laser light path, but cannot control the sampling detection. Therefore, when using handheld sampling in actual field and on-site detection, it is often necessary to point the probe at the sample while operating the software on the computer for detection. very inconvenient

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