Research on focal length calibration method of oblique installation collimator

Tao Wang; Liude Tian; Jianke Zhao; Yan Zhou; Kewei E; Kai Liu; Shangkuo Liu; Fei Liu; Lihong Yang; Yining Liu; Xun Xue; Huaixue Zhao

doi:10.3788/IRLA20220124

Infrared and Laser Engineering, Volume. 51, Issue 11, 20220124(2022)

Research on focal length calibration method of oblique installation collimator

Tao Wang¹, Liude Tian¹, Jianke Zhao¹, Yan Zhou¹, Kewei E¹, Kai Liu¹, Shangkuo Liu¹, Fei Liu², Lihong Yang³, Yining Liu¹, Xun Xue¹, and Huaixue Zhao¹

Author Affiliations

¹Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China

²School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China

³School of Optoelectronics Engineering, Xi’an Technological University, Xi'an 710021, China

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Figures & Tables(11)

Fig. 1. Schematic diagram of focal length calibration based on precision goniometry

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Fig. 2. Schematic diagram of focal length calibration under inclined installation

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Fig. 3. Mapping between the point on the target board and the total station angle

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Fig. 4. Layout of slit target board

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Fig. 5. Acquisition site of testing point angle of target board

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Table 1. Process data when the N₁,N₃ is located in different quadrants and parallel to the horizontal and vertical wire of the reticle (Unit: rad)

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Table 1. Process data when the N₁,N₃ is located in different quadrants and parallel to the horizontal and vertical wire of the reticle (Unit: rad)

Points to be measured		Imaging area of ${N_1},{N_3}$
Points to be measured		First quadrant	Second quadrant	Third quadrant	Fourth quadrant	Coincidence with the horizontal wire	Coincidence with the vertical wire
$ {N_1} $	$ \angle {A_o} $	0	0	0	0	0	0
	$ \angle {E_o} $	1.044524	1.044598	1.044626	1.044598	1.044621	1.044580
	$ \angle A $	0.000625	0.000568	0.002066	0.002547	0.002935	0
	$ \angle E $	1.045966	1.046047	1.043576	1.043868	1.044611	1.046057
$ {N_2} $	$ \angle {A_o} $	0	0	0	0	0	0
	$ \angle {E_o} $	1.044524	1.044598	1.044626	1.044598	1.044621	1.044580
	$ \angle A $	0.001348	0.001277	0.004519	0.005625	0.006489	0
	$ \angle E $	1.047709	1.047788	1.042299	1.042988	1.044615	1.047836
$ {N_3} $	$ \angle {A_o} $	0	0	0	0	0	0
	$ \angle {E_o} $	1.044524	1.044598	1.044626	1.044598	1.044621	1.044580
	$ \angle A $	0.002003	0.001749	0.006530	0.008002	0.009276	0
	$ \angle E $	1.049068	1.049175	1.041322	1.042263	1.044620	1.049236

Table 2. Focal length when the N₁,N₃ is located in different quadrants and parallel to the horizontal wire of the reticle after correcting the projection error （Unit: mm）

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Table 2. Focal length when the N₁,N₃ is located in different quadrants and parallel to the horizontal wire of the reticle after correcting the projection error （Unit: mm）

Points to be measured	Imaging area of ${N_1}, {N_3}$
Points to be measured	First quadrant	Second quadrant	Third quadrant	Fourth quadrant	Coincidence with the horizontal wire
$ {N_1} $	1981.77	1980.37	1980.24	1984.65	1983.93
$ {N_2} $	2009.70	2011.13	2011.01	2010.13	2007.73
$ {N_3} $	2041.14	2038.21	2037.35	2040.33	2038.74

Table 3. Focal length of different testing points after correcting the projection error and distortion (Unit: mm)

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Table 3. Focal length of different testing points after correcting the projection error and distortion (Unit: mm)

Points to be measured	The imaging area of ${N_1}, {N_3}$
Points to be measured	First quadrant	Second quadrant	Third quadrant	Fourth quadrant	Coincidence with the horizontal wire
$ {N_1} $	1981.77	1980.37	1980.24	1984.65	1983.93
$ {N_2} $	1983.58	1984.98	1984.86	1984.00	1981.63
$ {N_3} $	1983.99	1981.14	1980.31	1983.20	1981.66

Table 4. Focal length when theN₁, N₃ is parallel to the vertical wire of the reticle (Unit: mm)
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Table 4. Focal length when theN₁, N₃ is parallel to the vertical wire of the reticle (Unit: mm)
Points to be measured Coincidence with the vertical wire
$ {N_1} $ 1980.03
$ {N_2} $ 2009.58
$ {N_3} $ 2039.91

Table 5. Focal length when the N₁, N₃ is parallel to the horizontal wire of the reticle with correcting the distortion （Unit: mm）
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Table 5. Focal length when the N₁, N₃ is parallel to the horizontal wire of the reticle with correcting the distortion （Unit: mm）
Points to be measured Coincidence with the horizontal wire
$ {N_1} $ 996.42
$ {N_2} $ 995.23
$ {N_3} $ 995.22

Table 6. Extended uncertainty of focal length （Unit: mm）

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Table 6. Extended uncertainty of focal length （Unit: mm）

Points to be measured	Extended uncertainty
Points to be measured	First quadrant	Second quadrant	Third quadrant	Fourth quadrant	Coincidence with the horizontal wire	Coincidence with the vertical wire
$ {N_1} $	7.33	7.35	5.58	4.26	2.39	1.36
$ {N_2} $	3.33	3.34	2.55	1.93	1.08	0.60
$ {N_3} $	2.33	2.33	1.76	1.36	0.76	0.42

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Tao Wang, Liude Tian, Jianke Zhao, Yan Zhou, Kewei E, Kai Liu, Shangkuo Liu, Fei Liu, Lihong Yang, Yining Liu, Xun Xue, Huaixue Zhao. Research on focal length calibration method of oblique installation collimator[J]. Infrared and Laser Engineering, 2022, 51(11): 20220124

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Paper Information

Category: Photoelectric measurement

Received: Feb. 8, 2022

Accepted: --

Published Online: Feb. 9, 2023

The Author Email:

DOI:10.3788/IRLA20220124

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Process data when the N1,N3 is located in different quadrants and parallel to the horizontal and vertical wire of the reticle (Unit: rad)

Table 1. Process data when the N1,N3 is located in different quadrants and parallel to the horizontal and vertical wire of the reticle (Unit: rad)

Table 2. Focal length when the N1,N3 is located in different quadrants and parallel to the horizontal wire of the reticle after correcting the projection error （Unit: mm）

Table 2. Focal length when the N1,N3 is located in different quadrants and parallel to the horizontal wire of the reticle after correcting the projection error （Unit: mm）

Table 3. Focal length of different testing points after correcting the projection error and distortion (Unit: mm)

Table 3. Focal length of different testing points after correcting the projection error and distortion (Unit: mm)

Table 4. Focal length when theN1, N3 is parallel to the vertical wire of the reticle (Unit: mm)

Table 4. Focal length when theN1, N3 is parallel to the vertical wire of the reticle (Unit: mm)

Table 5. Focal length when the N1, N3 is parallel to the horizontal wire of the reticle with correcting the distortion （Unit: mm）

Table 5. Focal length when the N1, N3 is parallel to the horizontal wire of the reticle with correcting the distortion （Unit: mm）

Table 6. Extended uncertainty of focal length （Unit: mm）

Table 6. Extended uncertainty of focal length （Unit: mm）

Table 1. Process data when the N₁,N₃ is located in different quadrants and parallel to the horizontal and vertical wire of the reticle (Unit: rad)

Table 1. Process data when the N₁,N₃ is located in different quadrants and parallel to the horizontal and vertical wire of the reticle (Unit: rad)

Table 2. Focal length when the N₁,N₃ is located in different quadrants and parallel to the horizontal wire of the reticle after correcting the projection error （Unit: mm）

Table 2. Focal length when the N₁,N₃ is located in different quadrants and parallel to the horizontal wire of the reticle after correcting the projection error （Unit: mm）

Table 4. Focal length when theN₁, N₃ is parallel to the vertical wire of the reticle (Unit: mm)

Table 4. Focal length when theN₁, N₃ is parallel to the vertical wire of the reticle (Unit: mm)

Table 5. Focal length when the N₁, N₃ is parallel to the horizontal wire of the reticle with correcting the distortion （Unit: mm）

Table 5. Focal length when the N₁, N₃ is parallel to the horizontal wire of the reticle with correcting the distortion （Unit: mm）