The stability of spectroscopic instruments: A unified Allan variance computation scheme

TL;DR

This paper introduces a unified Allan variance computation scheme for spectroscopic instruments, enabling improved stability analysis and optimal observing strategies by combining existing methods and accounting for various noise sources.

Contribution

It presents a novel unified approach for Allan variance calculation that includes explicit error estimates and a new stability time definition applicable to different fluctuation spectra.

Findings

The unified scheme effectively traces total-power and spectroscopic fluctuations.

It provides explicit error estimates for Allan variance spectra and stability time.

The method reveals a non-linear impact of channel binning on noise and Allan time.

Abstract

The Allan variance is a standard technique to characterise the stability of spectroscopic instruments used in astronomical observations. The period for switching between source and reference measurement is often derived from the Allan minimum time. We propose a new approach for the computation of the Allan variance of spectrometer data combining the advantages of the two existing methods into a unified scheme. Using the Allan variance spectrum we derive the optimum strategy for symmetric observing schemes minimising the total uncertainty of the data resulting from radiometric and drift noise. The unified Allan variance computation scheme is designed to trace total-power and spectroscopic fluctuations within the same framework. The method includes an explicit error estimate both for the individual Allan variance spectra and for the derived stability time. A new definition of the instrument stability time allows to characterise the instrument even in the case of a fluctuation spectrum shallower than 1/f, as measured for the total power fluctuations in high-electron-mobility transistors. We find a non-linear impact of the binning of spectrometer channels on the resulting noise and the Allan time deviating from the description in existing theoretical treatments.