| Name: | Alka Singh |
| Affiliation: | Physical Research Laboratory |
| Conference ID : | ASI2024_378 |
| Title : | NISP: A Near Infrared Imager, Spectrometer and Polarimeter Instrument- Electronics Design and Development |
| Authors : | Alka
Deekshya R. Sarkar
A.B. Shah
Prashanth Kasarla
P.S. Patwal
Prachi Prajapati
Anwesh Mishra
Hitesh Adalja
Sachindra Naik
Shashikiran Ganesh |
| Authors Affiliation: | Physical Research Laboratory |
| Mode of Presentation: | Poster |
| Abstract Category : | Facilities, Technologies and Data science |
| Abstract : | NISP is an upcoming multi-functional near-infrared instrument for 2.5 m telescope at Mount Abu Observatory. With the target of having Imaging, Spectroscopy and Polarimetry capabilities, it will cover a wavelength range of 0.9 - 2.5 µm. The instrument is being developed around Teledyne’s HAWAII-2RG i.e. H2RG (2Kx2K) detector, which operates at cryogenic temperature (77 K). H2RG detector is to be mounted along with controlling SIDECAR ASIC inside LN2 filled cryogenic cooled Dewar. FPGA based controller for H2RG and SIDECAR ASIC has been mounted outside the Dewar at room temperature. We are using an H2RG Read out Integrated Circuit (ROIC) for testing the designed set-ups and developing an experience of detector handling tools as well as methodology. The ROIC is identical to the detector without the IR sensitive layer. It has some sensitivity in the optical band. We have done noise characterization at different gain settings & imaging with ROIC at room temperature as well as cryogenic temperature. After qualifying the characterization procedures, we shall be repeating the same with the actual science grade detector.
Smart stepper motors are used to facilitate the motion of filter wheels and optical components to realize different operating modes. Detector and ASIC temperatures are servo controlled using Lakeshore’s Temperature Controller (TC) 336. In addition, TC is being used to monitor temperatures for health checking of the instrument.
Detector, Motion and Temperature controllers onboard telescope will be interfaced to USB Hub and fiber-optic trans-receiver. Remote Host computer interface to remote end trans-receiver will be equipped with in-house developed GUI software, which has been developed in python to control all the functionalities of NISP.
In this contribution, we shall present the details of the characterization procedures, also discuss the detector and control electronics aspects of the instrument.
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