Impact of common modes correlations and time sampling on the total noise of a H2RG near-IR detector

TL;DR

This paper investigates noise reduction techniques and models the 1/f noise in a near-IR HgCdTe detector, demonstrating significant noise reduction and providing a predictive model to optimize sampling strategies for future space missions.

Contribution

It introduces effective common mode subtraction algorithms and a predictive 1/f noise model applicable to H2RG detectors, enhancing noise management for space-based infrared instruments.

Findings

Readout noise reduced by 60% with proper reference use

Developed a predictive model for 1/f noise across sampling frequencies

Avoided ad-hoc noise definitions through the model

Abstract

We present the readout noise reduction methods and the 1/f noise response of an 2Kx2K HgCdTe detector similar to the detectors that will be used in the Near Infrared Spectrometer Photometer - one of the instruments of the future ESA mission named Euclid. Various algorithms of common modes subtraction are defined and compared. We show that the readout noise can be lowered by 60% using properly the references provided within the array. A predictive model of the 1/f noise with a given frequency power spectrum is defined and compared to data taken in a wide range of sampling frequencies. In view of this model the definition of ad-hoc readout noises for different sampling can be avoided