Handheld dual-band common-path optical tomography imaging system

Abstract

The invention relates to a handheld dual-waveband common-path optical tomography imaging system. The system comprises a first waveband tomography module comprising are broadband light source, a firstcirculator, and a spectrometer; a second waveband tomography module comprising a swept-frequency light source, a second circulator, a coupler and a detector; a sample scanning handle comprising a first collimator, a second collimator, a dichroscope, a wave splitting front mirror, a reflector, an off-axis parabolic mirror and a two-dimensional MEMS galvanometer. According to the invention, the OCTsystem design of double wave bands, common path and wave front division is adopted, therefore, the system gives consideration to two aspects of high resolution and large imaging depth, the band rangeis more abundant, the problems of dispersion mismatching and polarization mismatching are effectively avoided, the splitting ratio of the reference light and the sample light is continuously adjustable, the signal-to-noise ratio of the system is further optimized, the utilization efficiency of the light source light is greatly improved, and nondestructive, in-situ, high-resolution and large-imaging-depth physical evidence detection is facilitated.

Description

technical field [0001] The invention relates to a hand-held dual-band co-channel optical tomography imaging system, and relates to the technical field of optical imaging. Background technique [0002] Optical coherence tomography (OCT) is a three-dimensional high-resolution tomographic imaging technology, which was first used in the field of biomedicine. In recent years, with its in-situ, non-destructive, rapid, high-resolution, and tomographic imaging features, OCT technology has gradually gained many new applications in the field of forensic science, such as applying it to car paint inspection, tape inspection, and latent fingerprint visualization. Because OCT can obtain characteristic information such as internal deep structure and spectrum of physical evidence without any preprocessing of samples, it has become a new technology of forensic science imaging with great application prospects. [0003] Traditional OCT scanning systems often use a single waveband. For example...

AI Technical Summary

Problems solved by technology

For example, it is generally necessary to build two sets of interference optical paths and two sets of detection devices (such as spectrometers) at the same time to achieve interference and detection in different wavelength bands. At the same time, under such a wide wavelength range, it is also necessary to consider solving dispersion mismatches, polarization mismatches, etc. As a result, there are many optical components and devices in the optical path of the system, the construction is complicated, the volume is large, the imaging speed is not high, and the scanning method is not flexible, the cost is high, and it cannot meet the complex and changeable imaging requirements of the crime scene.

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