New infrared camera of the Caucasian Mountain Observatory of the SAI MSU: design, main parameters, and first light
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| Formato: | Preprint |
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2024
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| author | Zheltoukhov, S. G. Tatarnikov, A. M. Belyakova, A. A. Koksharova, E. A. |
| author_facet | Zheltoukhov, S. G. Tatarnikov, A. M. Belyakova, A. A. Koksharova, E. A. |
| contents | This paper presents a prototype of an infrared photometer, created at SAI of MSU based on the commercial infrared module Gavin-615A. The operating spectral range of the photometer is 3-5 mkm. Investigations of the photometer's detector have shown that its parameters coincide with those stated by the manufacturer. The nonlinearity of the detector does not exceed approx 5% across the entire signal range, and coefficients for correction functions were determined. Additionally, we determined the readout noise RN=1200+-210 e-, the conversion coefficient GAIN=520+-9 e-/ADU, the signal magnitude of the bias frame BIAS = 960.5+-2.2 ADU, and the dark current 9.3e6 +-1.1e6 e-/s, which is the sum of the detector's dark current and the radiation from the entrance window of the detector module. The value of dark current was measured at a window temperature of 6C. Observations commenced with the photometer at the 2.5-m telescope of the Caucasian Mountain Observatory of MSU, with the first results presented in this paper. The unvignetted field of view was 30". In the M band under good atmospheric conditions, an image quality close to the diffraction limit was achieved. Images of a star with brightness L=7.96 and M=6.78 were obtained over the 20-second exposure time and a SNR=10. It is shown that at high image quality with SNR=3 and exposure of 20 seconds it is possible to observe stars up to L=9 mag and M=8 mag. The main module of the photometer was also used in measurements of the sky background brightness. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_01246 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | New infrared camera of the Caucasian Mountain Observatory of the SAI MSU: design, main parameters, and first light Zheltoukhov, S. G. Tatarnikov, A. M. Belyakova, A. A. Koksharova, E. A. Instrumentation and Methods for Astrophysics This paper presents a prototype of an infrared photometer, created at SAI of MSU based on the commercial infrared module Gavin-615A. The operating spectral range of the photometer is 3-5 mkm. Investigations of the photometer's detector have shown that its parameters coincide with those stated by the manufacturer. The nonlinearity of the detector does not exceed approx 5% across the entire signal range, and coefficients for correction functions were determined. Additionally, we determined the readout noise RN=1200+-210 e-, the conversion coefficient GAIN=520+-9 e-/ADU, the signal magnitude of the bias frame BIAS = 960.5+-2.2 ADU, and the dark current 9.3e6 +-1.1e6 e-/s, which is the sum of the detector's dark current and the radiation from the entrance window of the detector module. The value of dark current was measured at a window temperature of 6C. Observations commenced with the photometer at the 2.5-m telescope of the Caucasian Mountain Observatory of MSU, with the first results presented in this paper. The unvignetted field of view was 30". In the M band under good atmospheric conditions, an image quality close to the diffraction limit was achieved. Images of a star with brightness L=7.96 and M=6.78 were obtained over the 20-second exposure time and a SNR=10. It is shown that at high image quality with SNR=3 and exposure of 20 seconds it is possible to observe stars up to L=9 mag and M=8 mag. The main module of the photometer was also used in measurements of the sky background brightness. |
| title | New infrared camera of the Caucasian Mountain Observatory of the SAI MSU: design, main parameters, and first light |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2404.01246 |