Wideband, high spectral resolution UV convex grating imaging spectrometer based on an Offner structure

Qingsheng Xue; Jingyao Yang; Liyu Huang; Haoxuan Bai; Jitao Lu

doi:10.1364/AO.454620

Applied Optics
Vol. 61,
Issue 12,
pp. 3371-3380
(2022)
•https://doi.org/10.1364/AO.454620

Wideband, high spectral resolution UV convex grating imaging spectrometer based on an Offner structure

Qingsheng Xue, Jingyao Yang, Liyu Huang, Haoxuan Bai, and Jitao Lu

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Qingsheng Xue, Jingyao Yang, Liyu Huang, Haoxuan Bai, and Jitao Lu, "Wideband, high spectral resolution UV convex grating imaging spectrometer based on an Offner structure," Appl. Opt. 61, 3371-3380 (2022)

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Abstract

Ultraviolet is an effective electromagnetic spectrum in material detection, which has wide application prospects in aerospace and environmental monitoring. A conventional imaging spectrometer has a narrow UV band and low spectral resolution. To solve this problem, a convex grating imaging spectrometer based on an Offner structure with F#2.5 and a 13 mm long slit was designed and developed. The working wavelength ranges from 200 to 433 nm, and the spectral resolution is greater than 0.5 nm. A hyperspectral data cube with both high spatial and spectral resolutions of external scenes can be obtained by the push-broom imaging mode. Fine Fraunhofer lines can be distinguished in the spectrum. The ultraviolet hyperspectral imager can be used for marine oil spills, trace gas monitoring, and other applications that require high signal-to-noise ratios, wide bands, and high spectral resolutions.

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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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Specification	Channel 1	Channel 2
Band/nm	345–365	375–395
Central wavelength/nm	355	385
FWHM/nm	10	10
Measuring condition^a/ ( $m W \cdot c m^{- 2} \cdot µ m^{- 1} \cdot {S r}^{- 1}$ )	7.5	7.5
SNR	1000	1000
Measuring condition^b/ ( $m W \cdot c m^{- 2} \cdot µ m^{- 1} \cdot {S r}^{- 1}$ )	35.6/18.5	38.1/16.5

Specification	Value
Spectral range/nm	250–500
Spectral resolution/nm	2
Dispersion per pixel/nm	0.61
Spectral bands	409
Slit size	$25 µ m \times 12 m m$
FPA detector	CMOS
Frame rate (max.)/fps	30–50

Specification	Value
Spectral range/nm	200–433
Spectral resolution/nm	$< 0.5$
Focal length of telescope/mm	44
F#	2.5
Slit size	$22 µ m \times 13 m m$
Detector array size/pixel	$2048 \times 2048$
Pixel size/µm	$11 \times 11$
Modulation transfer function	$\geq 0.6 a t 22.7 l p / m m$
Frame rate/fps	48 at maximum
ADC	16 bits
Size/mm	$385 \times 330 \times 180$
Scanning method	Push-broom

Surface	Radius	Thickness/mm	Glass	Surface	Radius	Thickness/mm	Glass
OBJ	Infinite	Infinite		STO	Infinite	1.99
1	Infinite	10.00		15	13.709	5.90	CAF2
2	267.530	7.57	CAF2	16	−7.750	0.10
3	−92.500	0.10		17	−7.600	2.00	F_SILICA
4	33.460	5.87	CAF2	18	13.243	2.43
5	40.786	0.10		19	−326.958	2.94	CAF2
6	20.000	10.08	CAF2	20	−15.461	2.88
7	54.960	2.30		21	274.800	4.74	CAF2
8	98.990	7.12	F_SILICA	22	−14.658	1.38
9	8.954	5.97		23	−11.912	11.93	F_SILICA
10	−41.280	2.00	F_SILICA	24	−16.520	0.10
11	11.668	2.23		25	20.652	4.04	CAF2
12	13.124	2.40	CAF2	26	36.140	14.99
13	−127.430	0.10

Specification	Value
Grating groove density	600 gr/mm
Clear aperture/mm	60
Curvature radius/mm	149.97
Diffraction order	−1

Wavelength/nm	FWHM/Pixels	Spectral Resolution/nm
253.65	3.123	0.380
296.73	2.607	0.317
302.15	3.051	0.371
334.15	2.861	0.348
404.66	3.636	0.442
407.78	3.562	0.433

Fraunhofer Lines	Center Wavelength/nm	Element
N	358.12 nm	Iron
L	382.04 nm	Iron
K	393.36 nm	Calcium
H	396.84 nm	Calcium
h	410.17 nm	Hydrogen
G	430.77 nm	Calcium

Specification	Hyperspec UV-VIS	Ours
Spectral range/nm	250–500 nm	200–433 nm
Spectral resolution/nm	2	$< 0.5$
Slit size	$25 µ m \times 12 m m$	$22 µ m \times 13 m m$
Dispersion per pixel/nm	0.61	0.12
Frame rate/fps	30–50	48

Abstract

Data availability

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Figures (15)

Tables (8)

Equations (12)

Applied Optics