Design of a compact off-axis four-mirror objective system for a thermal camera

J. J. Alvarado-Martínez; F. S. Granados-Agustín; S. Vázquez y Montiel; A. Vázquez-Villa; A. A. Cornejo-Rodríguez

doi:10.1364/AO.441887

Applied Optics
Vol. 61,
Issue 3,
pp. A43-A49
(2022)
•https://doi.org/10.1364/AO.441887

Design of a compact off-axis four-mirror objective system for a thermal camera

J. J. Alvarado-Martínez, F. S. Granados-Agustín, S. Vázquez y Montiel, A. Vázquez-Villa, and A. A. Cornejo-Rodríguez

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J. J. Alvarado-Martínez, F. S. Granados-Agustín, S. Vázquez y Montiel, A. Vázquez-Villa, and A. A. Cornejo-Rodríguez, "Design of a compact off-axis four-mirror objective system for a thermal camera," Appl. Opt. 61, A43-A49 (2022)

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Abstract

The optical design of a compact off-axis four-mirror objective system (OFOS) of a thermal camera for a syndromic surveillance system that captures bioclinical signals, like temperature, directly related to the physical symptoms of the COVID-19 disease through thermal images is presented. The OFOS design works on wavelengths of 7.5–14 µm, with an $f$-number of 4, and a field of view (FOV) of ${{24}} \times {{4}}$ deg.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Equations (15)

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	Surface Type	Radius (mm)	Distance (mm)	Conic	Size (mm)	Decenter $Y$ (mm)	Tilt $X$ (deg)
-	Coordinate break	-	-	-	-	50	0
$M_{1}$	$X Y$ polynomial	−100	−20	0	$44 \times 24$	-	-
	Coordinate break	-	-	-	-	−12	0
$M_{2}$ (Stop)	$X Y$ polynomial	−46.154	20	0	$21 \times 14$	-	-
	Coordinate break	-	-	-	-	−2	0
$M_{3}$	$X Y$ polynomial	−52.174	−20	0	$20 \times 20$	-	-
	Coordinate break	-	-	-	-	2	0
$M_{4}$	$X Y$ polynomial	−116.757	25	0	$21.6 \times 11$	-	-

Surface	Norm. Radius (mm)	Coefficients $a_{i}$ of $X Y$ Polynomial
		X0Y1	X2Y0	X0Y2	X2Y1	X0Y3	X4Y0	X2Y2	X0Y4
		1.308	2.263	−2.323	2.893	0.397	3.593	−0.048	0.253
$M_{1}$	50	X4Y1	X2Y3	X0Y5	X6Y0	X4Y2	X2Y4	X0Y6	X6Y1
		0.591	−2.033	−0.132	−0.529	0.289	1.809	0.128	0.683
		X4Y3	X2Y5	X0Y7	X8Y0
		−0.229	0.498	−0.117	3.285
		XY01	X2Y0	X0Y2	X2Y1	X0Y3	X4Y0	X2Y2	X0Y4
		0.820	−0.048	−0.418	0.023	0.007	0.172	0.096	0.021
$M_{2}$	19	X4Y1	X2Y3	X0Y5	X6Y0	X4Y2	X2Y4	X0Y6	X6Y1
		0.156	−0.093	−0.063	−0.085	0.210	0.229	0.012	0.039
		X4Y3	X2Y5	X0Y7	X8Y0
		−0.097	0.120	0.020	0.141
		X0Y1	X2Y0	X0Y2	X2Y1	X0Y3	X4Y0	X2Y2	X0Y4
		−0.288	0.101	0.123	−0.144	−0.045	−0.019	0.029	0.020
$M_{3}$	16	X4Y1	X2Y3	X0Y5	X6Y0	X4Y2	X2Y4	X0Y6	X6Y1
		−0.026	0.012	0.0003	0.0004	−0.025	0.0005	−0.007	−0.0007
		X4Y3	X2Y5	X0Y7	X8Y0
		−0.012	−0.0009	−0.002	0.0004
		X0Y1	X2Y0	X0Y2	X2Y1	X0Y3	X4Y0	X2Y2	X0Y4
		2.719	0.242	0.279	−0.199	0.080	0	0	0
$M_{4}$	14	X4Y1	X2Y3	X0Y5	X6Y0	X4Y2	X2Y4	X0Y6	X6Y1
		0	0	0	0	0	0	0	0
		X4Y3	X2Y5	X0Y7	X8Y0
		0	0	0	0

Mirror	Radius (mm)	Tolerance (mm)	RMS Wavefront (Nominal)	RMS Wavefront (Mean)	Change in Back Focus (mm)
$M_{1}$	−100	$\pm 0.20$	15.26169704	15.25330391	−0.026493
$M_{2}$ (Stop)	−46.154	$\pm 0.20$	15.26169704	15.26884136	0.010690
$M_{3}$	−52.174	$\pm 0.20$	15.26169704	15.25874384	−0.004861
$M_{4}$	−116.757	$\pm 0.20$	15.26169704	15.26170798	0.000012

	Surface Type	Radius (mm)	Distance (mm)	Conic	Size (mm)	Decenter $Y$ (mm)	Tilt $X$ (deg)
-	Coordinate break	-	-	-	-	50	0
$M_{1}$	$X Y$ polynomial	−100	−20	0	$44 \times 24$	-	-
	Coordinate break	-	-	-	-	−12	0
$M_{2}$ (Stop)	$X Y$ polynomial	−46.154	20	0	$21 \times 14$	-	-
	Coordinate break	-	-	-	-	−2	0
$M_{3}$	$X Y$ polynomial	−52.174	−20	0	$20 \times 20$	-	-
	Coordinate break	-	-	-	-	2	0
$M_{4}$	$X Y$ polynomial	−116.757	25	0	$21.6 \times 11$	-	-

Surface	Norm. Radius (mm)	Coefficients $a_{i}$ of $X Y$ Polynomial
		X0Y1	X2Y0	X0Y2	X2Y1	X0Y3	X4Y0	X2Y2	X0Y4
		1.308	2.263	−2.323	2.893	0.397	3.593	−0.048	0.253
$M_{1}$	50	X4Y1	X2Y3	X0Y5	X6Y0	X4Y2	X2Y4	X0Y6	X6Y1
		0.591	−2.033	−0.132	−0.529	0.289	1.809	0.128	0.683
		X4Y3	X2Y5	X0Y7	X8Y0
		−0.229	0.498	−0.117	3.285
		XY01	X2Y0	X0Y2	X2Y1	X0Y3	X4Y0	X2Y2	X0Y4
		0.820	−0.048	−0.418	0.023	0.007	0.172	0.096	0.021
$M_{2}$	19	X4Y1	X2Y3	X0Y5	X6Y0	X4Y2	X2Y4	X0Y6	X6Y1
		0.156	−0.093	−0.063	−0.085	0.210	0.229	0.012	0.039
		X4Y3	X2Y5	X0Y7	X8Y0
		−0.097	0.120	0.020	0.141
		X0Y1	X2Y0	X0Y2	X2Y1	X0Y3	X4Y0	X2Y2	X0Y4
		−0.288	0.101	0.123	−0.144	−0.045	−0.019	0.029	0.020
$M_{3}$	16	X4Y1	X2Y3	X0Y5	X6Y0	X4Y2	X2Y4	X0Y6	X6Y1
		−0.026	0.012	0.0003	0.0004	−0.025	0.0005	−0.007	−0.0007
		X4Y3	X2Y5	X0Y7	X8Y0
		−0.012	−0.0009	−0.002	0.0004
		X0Y1	X2Y0	X0Y2	X2Y1	X0Y3	X4Y0	X2Y2	X0Y4
		2.719	0.242	0.279	−0.199	0.080	0	0	0
$M_{4}$	14	X4Y1	X2Y3	X0Y5	X6Y0	X4Y2	X2Y4	X0Y6	X6Y1
		0	0	0	0	0	0	0	0
		X4Y3	X2Y5	X0Y7	X8Y0
		0	0	0	0

J. J. Alvarado-Martínez	https://orcid.org/0000-0002-0482-6112
A. Vázquez-Villa	https://orcid.org/0000-0002-1729-8240

Abstract

Data Availability

Cited By

Figures (7)

Tables (3)

Equations (15)

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Applied Optics

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