High etendue UV camera for simultaneous four-color imaging on a single detector

Brian A. Hicks, Meredith E. Danowski, Jason F. Martel, and Timothy A. Cook

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Brian A. Hicks, Meredith E. Danowski, Jason F. Martel, and Timothy A. Cook, "High etendue UV camera for simultaneous four-color imaging on a single detector," Appl. Opt. 52, 5194-5200 (2013)

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Abstract

We describe a high etendue ( $0.12 {cm}^{2} sr$ ) camera that, without moving parts, simultaneously images four ultraviolet bands centered at 140, 175, 215, and 255 nm on a single detector into a minimum of $\sim 7500$ resolution elements. In addition to being an efficient way to make color photometric measurements of a static scene, the camera described here enables detection of spatial and temporal information that can be used to reveal energy dependent physical phenomena to complement the capability of other instruments ranging in complexity from filter wheels to integral field spectrographs.

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Instrument	Technique/# Detectors	Bandpass (nm)	$A Ω ({cm}^{2} sr)$	Resolution ( $D \times N$ )	Ref.
IMAGER	Beamsplitters/1	125–300	$1.2 \times 10^{- 1}$	$100 \times 4$	This work
GALEX	Beamsplitter/2	135–275	$6.8 \times 10^{- 1}$	$720 \times 2$	[17]
WFPC3/UV	Filter wheel/1	200–300	$9.0 \times 10^{- 2}$	$4096 \times 3$	[3]
ACS/HRC/NUV	Filter wheel/1	215–345	$6.5 \times 10^{- 4}$	$1024 \times 3$	[16]
SPINR	Tomography/4	90–145	$1.2 \times 10^{- 4}$	$60 \times 3$	[18]

Band (nm)	Optical Train	Image Diameter (mm)	Resels	Eff. (%)	Distortion Max. (%)
140	F1, MF, W	16.2	3087	40	5.7
175	F1, F2, MF, CF, W	16.3	18,571	38	5.2
215	F1, F2, F3, 3(FS, M), M, FS, W	16.6	1987	26	9.3
255	F1, F2, F3, FS, F4, 2M, 2FS, 2M, FS, W	16.6	3202	25	6.7

Instrument	Technique/# Detectors	Bandpass (nm)	$A Ω ({cm}^{2} sr)$	Resolution ( $D \times N$ )	Ref.
IMAGER	Beamsplitters/1	125–300	$1.2 \times 10^{- 1}$	$100 \times 4$	This work
GALEX	Beamsplitter/2	135–275	$6.8 \times 10^{- 1}$	$720 \times 2$	[17]
WFPC3/UV	Filter wheel/1	200–300	$9.0 \times 10^{- 2}$	$4096 \times 3$	[3]
ACS/HRC/NUV	Filter wheel/1	215–345	$6.5 \times 10^{- 4}$	$1024 \times 3$	[16]
SPINR	Tomography/4	90–145	$1.2 \times 10^{- 4}$	$60 \times 3$	[18]

Band (nm)	Optical Train	Image Diameter (mm)	Resels	Eff. (%)	Distortion Max. (%)
140	F1, MF, W	16.2	3087	40	5.7
175	F1, F2, MF, CF, W	16.3	18,571	38	5.2
215	F1, F2, F3, 3(FS, M), M, FS, W	16.6	1987	26	9.3
255	F1, F2, F3, FS, F4, 2M, 2FS, 2M, FS, W	16.6	3202	25	6.7

High etendue UV camera for simultaneous four-color imaging on a single detector

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Applied Optics