Micro integrated CMOS optical fiber spectrometer

Abstract

The invention discloses a micro integrated CMOS optical fiber spectrometer, which comprises a light source, an optical fiber, a blazed grating, a concave lens, a linear CMOS sensor, an upper computerand the like. When the selected light source is irradiated to a to-be-tested sample and enters the optical fiber spectrometer, due to different absorption and reflection by different substances towards spectrums in different bands, the spectral characteristics of a to-be-tested substance can be detected, and the kind and the concentration of the substance can thus be judged. The spectrometer is characterized in that an incident optical fiber is adopted, and through optical fiber coupling, a modular measurement system can be formed by the light source and the optical fiber spectrometer. On onehand, the optical fiber replaces an incident slit, the used optical fiber core diameter is changed to adjust the slit width, and on the other hand, the optical fiber is used for transmitting light source signals and sample output signals at the same time, the blazed grating and the concave lens carry out splitting and imaging on the tested light source, the sensor adopts the linear CMOS digital sensor, the CMOS sensor can put a driving circuit, an amplification circuit and a signal processing circuit together, and the size of the spectrometer can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of spectrum measurement, and in particular relates to a high-speed miniature optical fiber spectrometer based on linear array digital CMOS. Background technique [0002] Spectroscopic instruments are instruments for spectroscopic research and material analysis, and are used in various fields, such as concentration detection of chemical components, detection of air pollutants, or color measurement. Traditional spectrometers cannot meet real-time and on-site detection due to their large size, complex structure, and limited use environment. In view of this, the development of micro-integrated spectrometers has become a research hotspot in current spectral measurement technology under the prerequisite of ensuring measurement accuracy. . [0003] With the continuous advancement of science and technology, optical fiber technology and optical fiber processing have also developed rapidly, and new devices based on o...

AI Technical Summary

Problems solved by technology

The use of optical fiber as the light guide medium and the replacement of the incident slit has also become a hot spot for the development of micro-spectrometers. With the rapid development of semiconductor technology and integrated circuits, spectrometers used to almost all use CCD sensors. Now CMOS sensors have better noise and sensor response uniformity than CCDs. The circuit structure of the CCD is determined by the internal reading method of the pixel. The circuit structure is complex and the power consumption is large. At present, the external circuit and the chip have not been integrated together. The linear array digital CMOS sensor integrates the drive circuit, amplifier circuit, signal The processing circuit and the A / D module are put together to achieve integration, thereby realizing the miniaturization of the image sensor, which in turn provides a research direction for the miniaturization of the spectrometer

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