Auto-collimation absolute angle measurement method and system based on spectrum discrimination technology
A technology of self-collimation and fiber-optic collimation mirror, which is applied in the direction of measuring devices, diffraction gratings, optical devices, etc., can solve the problems of inability to achieve absolute measurement, inconvenience, alignment errors between laser sources and self-collimation units, and achieve Realize the effect of dynamic high-precision reconstruction
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Embodiment 1
[0073] Embodiment 1: Based on the above principles, the self-collimation absolute angle measurement method provided by this embodiment, the implementation process includes:
[0074] S1. The optical frequency comb transmits optical pulses containing multiple longitudinal modes to the fiber circulator;
[0075] S2. The light pulses introduced by the fiber circulator are emitted to the grating through the fiber collimator, and diffracted by the grating to generate a group of first-order diffracted beams with different diffraction angles;
[0076] S3. When the angle between the grating normal and the incident beam changes, the incident beam with a certain spectral width can be re-coupled into the fiber collimator and emitted to the fiber circulator after diffraction by the grating;
[0077] S4. The center frequency of the coupled beam is obtained by analyzing the optical comb spectral components derived from the optical fiber circulator, so as to realize the measurement of the ang...
Embodiment 2
[0078] Example 2: as figure 1 As shown, the self-collimation absolute angle measuring system proposed in this embodiment includes a single optical comb 1 , an optical fiber circulator 2 , an optical fiber collimating mirror 3 and a reflection grating 4 .
[0079] The normal line of the reflective grating 4 forms a certain initial angle with the light exit direction of the fiber collimator 3, that is, the direction of the incident beam. In the process of angle measurement, after the incident beam with a certain spectral width is diffracted by the reflective grating 4, some longitudinal mode components can always be recoupled into the fiber collimator 3 approximately parallel to the incident direction to ensure the effectiveness of the measurement.
[0080] The single optical comb 1 emits optical pulses containing multiple longitudinal modes to the fiber circulator 2;
[0081] The light pulses imported through the fiber circulator 2 are emitted to the reflection grating 4 throu...
Embodiment 3
[0084] Embodiment 3: This embodiment differs from Embodiment 2 in that, as image 3 As shown, this embodiment adopts a double optical comb, including a first optical frequency comb 5 and a second optical frequency comb 6. The first optical frequency comb 5 and the second optical frequency comb 6 are combined by the optical fiber coupler 7 and sent to the optical fiber The circulator 2 is derived, and is collimated and incident on the reflection grating 4 by the optical fiber collimator 3, and the optical signal derived from the optical fiber circulator 2 is sent to the signal processing device 8 for analysis and calculation of the optical comb spectral components. The processing device 8 includes a detector 81 , a filter 82 and a processor 83 , and the specific process of discriminating and calculating the optical comb spectral components will not be described in detail.
[0085] Preferably, the dual optical comb system in this embodiment can use two optical frequency combs wi...
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