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High-speed spectral domain optical coherence tomography system based on Mach-Zehnder interferometer
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An optical coherence tomography and imaging system technology, applied in the field of high-speed spectral domain optical coherence tomography imaging system, can solve the detection performance of limited linear array CCD/CMOs camera and the ability of back-end signal processing, imaging speed and imaging depth Limit and reduce the utilization rate of luminous flux, etc., to achieve the effect of ensuring sensitivity, improving utilization rate and speeding up imaging speed
Active Publication Date: 2022-07-12
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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[0003] However, traditional spectral-domain optical coherence tomography systems are basically based on Michelson interferometers, and in Michelson interferometers, nearly half of the luminous flux will return to the direction of the light source, reducing the utilization of luminous flux
At the same time, the traditional spectral domain optical coherence tomography system first uses gratings to split light, and then uses linear array CCD / CMOs cameras to obtain optical interference signals, which is limited by the detection performance of linear array CCD / CMOs cameras and the limitations of back-end signal processing. capability, the imaging speed and imaging depth of traditional spectral domain optical coherence tomography systems are greatly limited
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Embodiment 1
[0049] See figure 1 , the Mach-Zehnder interferometer-based high-speed spectral domain optical coherence tomography system provided in this embodiment includes a broadband light source 1, a 1×2 fiber coupler 2, a reference arm, a sample arm, a beam combining unit, and a rotating detector array .
[0050] See figure 2 , the rotating detector array includes a signal processing and system control module 21, and a 1×N optical switch 17 and an avalanche photodiode detector array 18 connected to the signal processing and system control module 21; the 1×N The number of optical signal transmission channels in the optical switch 17 is the same as the number of avalanche photodiodes in the avalanche photodiode detector array 18 , and the optical signal transmission channels in the 1×N optical switch 17 are the same as the avalanche photodiodes in the avalanche photodiode detector array 18 . The avalanche photodiodes in the diode detector array 18 are connected in one-to-one correspon...
Embodiment 2
[0087] image 3 A specific embodiment of a high-speed spectral domain optical coherence tomography system based on Mach-Zehnder interferometer is given.
[0088] The high-speed spectral domain optical coherence tomography system includes a broadband light source 1, a 1×2 fiber coupler 2, a three-port fiber circulator 3, a polarization controller 4, a first collimating lens 51, a second collimating lens 52, a scanning Galvo mirror 6, four-dimensional adjustment bracket 7, first focusing lens 81, second focusing lens 82, tested sample 9, precision sliding sample platform 10, mirror group 11, total reflection prism 12, first fiber collimator 13 , 2×1 fiber coupler 14, transmissive volume phase holographic diffraction grating 15, second fiber collimator 16, 1×N optical switch 17, avalanche photodiode detector array 18, bias voltage control module 19, signal readout Circuit 20 , signal processing and system control module 21 .
[0089] The working process of the high-speed spectr...
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Abstract
The invention discloses a high-speed spectral domain optical coherence tomography imaging system based on a Mach-Zehnder interferometer. The light emitted by the broadband light source is divided into two beams by a 1×2 fiber coupler, and enters the sample arm and the reference arm respectively to obtain the backscattered light generated by the tested sample output by the sample arm and the reflected light output by the reference arm; The scattered light and reflected light are combined by the beam combining unit to form a combined beam; when the combined beam enters the 1×N optical switch, the signal processing and system control module controls the optical signal transmission channel of the 1×N optical switch to open according to the set mode, At the same time, the avalanche photodiode in the avalanche photodiode detector array corresponding to the optical signal transmission channel opened in the 1×N optical switch is controlled to be in avalanche mode; at the same time, the sample under test is reconstructed based on the obtained optical signal detected by the avalanche photodiode Image. The invention can achieve the purposes of high imaging speed, high imaging quality and deep imaging depth.
Description
technical field [0001] The invention relates to the technical field of optical imaging, in particular to a high-speed spectral domain optical coherence tomography system based on a Mach-Zehnder interferometer, which can be used for rapid detection and real-time monitoring of material deformation and defects in the industrial field. Background technique [0002] Optical coherence tomography is a non-contact and non-destructive optical imaging technology based on coherent optics proposed in the 1990s. The optical coherence tomography system is based on low-coherence measurement technology, and its imaging process is similar to ultrasonic imaging; compared to other incoherent optical imaging methods, such as traditional optical microscopy, ultrasonic imaging, near-field scanning imaging and computed tomography, optical coherence tomography effectively makes up for the shortcomings of other technologies in terms of imaging depth and imaging speed. [0003] However, the traditio...
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