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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: 2010-10-06
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 structure diagram of the portable optical fiber near infrared detector is as figure 1 Shown. The processor sends a control instruction to the light source modulation circuit to make the light source modulation circuit sinusoidally modulate the light source to emit light, and the sinusoidal light emission frequency and light 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 is transmitted through the light source fiber to enter the biological tissue under test. The detection fiber placed on the surface of the tested biological tissue at a distance of several centimeters on the same side of the light source fiber receives the backscattered photons after absorption and scattering by the biological tissue, and the detection fiber transmits the received photons to the detector coupled to the other end of the detection fiber . The detector convert...

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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 portability of 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 a non-invasive optical imaging technique developed in the past 20 years to measure changes in hemodynamic parameters. Biological tissues have the characteristics of low absorption and high scattering for near-infrared light with a wavelength of 600 to 900 nm. Therefore, light in this band can penetrate the biological tissues to a thickness of several centimeters to detect deep biological tissues. According to the different imaging principles, NIR 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 time resolution, less movement restriction during measurement, low cost, a...

Claims

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Application Information

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