Research on the parallelism of the active and passive dual-band (laser/IR) composite system

Fei Liu; Xiufen Chen; Songshan Li; Zichen Nie

doi:10.3788/IRLA20210771

Journals >Infrared and Laser Engineering >Volume 51 >Issue 7 >Page 20210771 > Article

Infrared and Laser Engineering
Vol. 51, Issue 7, 20210771 (2022)

Research on the parallelism of the active and passive dual-band (laser/IR) composite system

Fei Liu, Xiufen Chen, Songshan Li, and Zichen Nie

Author Affiliations

North China Research Institute of Electro-Optics, Beijing 100015, China

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DOI: 10.3788/IRLA20210771 Cite this Article

Fei Liu, Xiufen Chen, Songshan Li, Zichen Nie. Research on the parallelism of the active and passive dual-band (laser/IR) composite system[J]. Infrared and Laser Engineering, 2022, 51(7): 20210771 Copy Citation Text

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Fig. 1. Schematic of the active and passive dual-band (laser/IR) composite system

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Fig. 2. Relationship between light reflection and mirror position

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Fig. 3. Projection relationship between the azimuth swing of the FSM and the laser azimuth, laser pitch

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Fig. 4. Schematic diagram of the parallelism test

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Fig. 5. Comparison chart of the given values and measured values before and after parallelism correction

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FSM azimuth angle /(°)	Laser azimuth angle			Laser pitch angle /μrad
FSM azimuth angle /(°)	Theoretical calculation /(°)	Approximate calculation /(°)	Error Δ /μrad	Laser pitch angle /μrad
−1.00	−1.414069	−1.414213	2.505175	152.2993
−0.75	−1.060599	−1.060660	1.056983	85.66360
−0.50	−0.707088	−0.707106	0.313204	38.07120
−0.25	−0.353551	−0.353553	0.039152	9.517574
0.00	0	0	0	0
0.25	0.353551	0.353553	−0.039152	9.517574
0.50	0.707088	0.707106	−0.303204	38.07120
0.75	1.060599	1.060660	−1.056983	85.66360
1.00	1.414069	1.414213	−2.505175	152.2993

Table 1. Calculation results of the changes in laser azimuth and pitch caused by the azimuth swing of the FSM

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Number	Theoretical setting value		Actual measured value
Number	Azimuth/(°)	Pitch/(°)	Azimuth/(°)	Pitch/(°)
1	−1.4000	1.4000	−1.4537	1.3453
2	−1.4000	0.9333	−1.4535	0.9733
3	−1.4000	0.4667	−1.3556	0.4267
4	−1.4000	0	−1.3562	−0.0362
5	−1.4000	−0.4667	−1.4053	−0.5067
6	−1.4000	−0.9333	−1.3536	−0.9833
7	−1.4000	−1.4000	−1.3934	−1.4532
8	−0.9333	1.4000	−0.9833	1.4263
9	−0.9333	0.9333	−0.9333	0.8933
10	−0.9333	0.4667	−0.9833	0.4267
11	−0.9333	0	−0.9833	0.0243
12	−0.9333	−0.4667	−0.9433	−0.4367
13	−0.9333	−0.9333	−0.8933	−0.9835
14	−0.9333	−1.4000	−0.8933	−1.4521
15	−0.4667	1.4000	−0.5067	1.3421
16	−0.4667	0.9333	−0.4767	0.9744
17	−0.4667	0.4667	−0.5069	0.4267
18	−0.4667	0	−0.4452	0.0021
19	−0.4667	−0.4667	−0.5049	−0.5062
20	−0.4667	−0.9333	−0.4665	−0.9833
21	−0.4667	−1.4000	−0.5024	−1.4520
22	0	1.4000	0.0521	1.4150
23	0	0.9333	0.0213	0.9733
24	0	0.4667	0.0189	0.4267
25	0	0	0.0238	−0.0321
26	0	−0.4667	0.0457	−0.5064
27	0	−0.9333	0.0562	−0.8933
28	0	−1.4000	0.0286	−1.4569
29	0.4667	1.4000	0.4667	1.3498
30	0.4667	0.9333	0.5062	0.9733
31	0.4667	0.4667	0.4052	0.4267
32	0.4667	0	0.4462	0.0245
33	0.4667	−0.4667	0.5089	−0.5067
34	0.4667	−0.9333	0.5011	−0.9811
35	0.4667	−1.4000	0.4767	−1.4502
36	0.9333	1.4000	0.9834	1.3488
37	0.9333	0.9333	0.9456	0.9344
38	0.9333	0.4667	0.9120	0.4261
39	0.9333	0	0.9133	0.0430
40	0.9333	−0.4667	0.8958	−0.5043
41	0.9333	−0.9333	0.9726	−0.9725
42	0.9333	−1.4000	0.9643	−1.4501
43	1.4000	1.4000	1.4222	1.3862
44	1.4000	0.9333	1.4220	0.9734
45	1.4000	0.4667	1.4501	0.4962
46	1.4000	0	1.4498	0.0321
47	1.4000	−0.4667	1.4460	−0.4391
48	1.4000	−0.9333	1.4508	−0.9882
49	1.4000	−1.4000	1.3994	−1.3968

Table 2. Record form of the test data

Fei Liu, Xiufen Chen, Songshan Li, Zichen Nie. Research on the parallelism of the active and passive dual-band (laser/IR) composite system[J]. Infrared and Laser Engineering, 2022, 51(7): 20210771

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