Frequency Analysis of the noise in the Fowler(n) sampling of a H2RG(2Kx2K) Near-IR Detector

TL;DR

This study analyzes the noise characteristics of a Teledyne H2RG near-IR detector using Fowler sampling, demonstrating how noise reduction depends on sampling parameters and frequency behavior.

Contribution

It provides a detailed frequency-based noise model for the H2RG detector and explores how Fowler sampling parameters influence noise performance.

Findings

Fowler mode with n=240 achieves 2.63e noise level.

A three-parameter power spectrum models noise variation.

Noise variance decreases with frequency with an exponent of 0.62.

Abstract

The readout noise of a H2RG HgCdTe NIR detector from Teledyne is measured at a temperature T=110K. It is shown that a Fowler mode with n = 240 allows to reach a noise of 2.63e (single read). A description of the power spectrum in terms of 3 parameters reproduces the variation of the noise as a function the number of Fowler samples, as well as its dependence on the periodicity of the sampling. The variance of the noise decreases with frequency with an effective power of 0.62 in our measurement domain. The behaviour of the detector under different experimental conditions can then be predicted.