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Optical fiber near-infrared spectrometer

A near-infrared spectroscopy and detector technology, applied in blood flow measurement and other directions, can solve problems such as the inability to meet cognitive neuroscience, and achieve the effect of simplifying hardware circuit design, high stability and low price

Inactive Publication Date: 2012-07-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Due to the limitations of volume and cost, the above-mentioned foreign fiber-optic near-infrared brain function imagers cannot meet the needs of cognitive neuroscience research.

Method used

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  • Optical fiber near-infrared spectrometer
  • Optical fiber near-infrared spectrometer
  • Optical fiber near-infrared spectrometer

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Experimental program
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Effect test

Embodiment Construction

[0042] The structural block diagram of the portable optical fiber near-infrared detector is as follows figure 1 shown. The processor sends a control command to the light source modulation circuit, so that the light source modulation circuit performs sinusoidal modulation on the light source to emit light, and the sinusoidal emission frequency and luminous power of the light source can be controlled by the light source modulation circuit. The sinusoidal light emitted by the light source is coupled into the light source fiber, and transmitted through the light source fiber to enter the measured biological tissue. A detection fiber placed at a distance of several centimeters between the surface of the biological tissue under test and the same side of the light source fiber receives the backscattered photons absorbed and scattered by the biological tissue, and the detection fiber transmits the received photons to the detector coupled at the other end of the detection fiber . The...

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Abstract

The invention relates to an optical fiber near-infrared spectrometer in the technical field of medical devices. The optical fiber near-infrared spectrometer uses multi-tail optical fiber collimator as light source optical fiber, uses a number lock technology as a technical scheme for weak signal extraction, uses a laser diode with a PD as a light source for sinusoidal modulation, uses an avalanche photodiode (APD) or photomultiplier tube (PMT) as a detector, and uses thick core-diameter plastic optical fiber, liquid-core optical fiber, silica optical fiber, a silica optical fiber bundle or glass optical fiber bundle as detection optical fiber. The invention has the advantages that the instrument can conduct nondestructive real-time hemodynamic parameter detection to biological tissues sheltered by hairs, the noise level of the instrument is low, the time resolution is high, the stability is high, the price is cheap, the hardware circuit design is greatly simplified and the portabilityof the instrument is realized.

Description

technical field [0001] The invention relates to an optical fiber near-infrared spectrum detector in the technical field of medical equipment. Background technique [0002] Near-infrared spectroscopy is an optical imaging technology developed in the past 20 years for non-invasive measurement of changes in hemodynamic parameters. Biological tissue has the characteristics of low absorption and high scattering of near-infrared light with a wavelength of 600-900 nm, so the light in this band can penetrate the thickness of several centimeters of biological tissue to detect deep biological tissue. According to the different imaging principles, near-infrared spectroscopy can be divided into continuous light technology, frequency domain modulation technology and time resolution technology. Among them, continuous light near-infrared spectroscopy based on the modified Beer-Lambert absorption law has the advantages of high temporal resolution, less movement restriction during measureme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/026
Inventor 骆清铭龚辉张中兴何勇
Owner HUAZHONG UNIV OF SCI & TECH