Miniature long wavelength near infrared internet of things node based on linear variable filter

Abstract

The invention discloses a miniature long wavelength near infrared internet of things node based on a linear variable filter; the miniature long wavelength near infrared internet of things node comprises the linear variable filter, a linear array InGaAs focal plane detector, a detector drive circuit, a spectroscopic data acquisition circuit, a wireless communication module and a lithium battery; the linear variable filter is coupled with a photosensitive chip of the linear array InGaAs focal plane detector so as to replace a raster as a light splitter, thus omitting incidence fibers; the spectroscopic data acquisition circuit and the wireless communication module can realize wireless acquisition of the 0.9-1.7um waveband spectroscopic data; compared with a short wavelength near infrared area of a CMOS near infrared sensor, the long wavelength near infrared waveband responding to the linear array InGaAs focal plane detector can provide higher scientific research application values. The optical system structure can be simplified; the wireless communication and lithium battery can prevent the inconveniences caused by data lines and power lines, thus miniaturizing the long wavelength near infrared internet of things node, and providing technical supports for the internet of things expansion in the long wavelength near infrared spectroscopic analysis field.

Description

technical field [0001] The invention relates to the application technology of the Internet of Things and the acquisition of long-wave near-infrared spectrum information. By using a linear gradient filter instead of a grating as a light-splitting element to simplify the optical system and design a miniaturized electronic system, the spectrum in the 0.9-1.7 μm band can be realized in the nodes of the Internet of Things The wireless collection of data is the technical basis for the application of long-wave near-infrared spectroscopy in the field of Internet of Things. Background technique [0002] The near-infrared spectrum is usually divided into two segments: the short-wave near-infrared spectral region of 0.7-1.1 μm and the long-wave near-infrared spectral region of 1.1-2.5 μm. The early infrared application of the Internet of Things is infrared communication using infrared photodiodes, which does not belong to the field of spectral analysis, such as the infrared spectral an...

AI Technical Summary

Problems solved by technology

Existing InGaAs long-wave near-infrared spectroscopy equipment is limited to varying degrees by the volume of the optical system, optical fiber probes, data lines, and power lines. Near-infrared light diffuse reflection probes must be used, which adds inconvenience to IoT applications

This kind of equipment is bulky and expensive. Although there has been a trend towards miniaturization, it still has many problems such as poor mobility and high cost when directly used as an IoT node. There is an urgent need for a long-wave near-infrared device with miniaturization characteristics. Internet of Things nodes to promote the promotion and application of near-infrared spectral analysis technology in the field of Internet of Things

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