Table of Contents
What is meant by flicker noise?
Flicker noise is a type of electronic noise with a 1/f power spectral density. It is therefore often referred to as 1/f noise or pink noise, though these terms have wider definitions.
How can I reduce flicker noise?
Flicker noise can be effectively reduced by a technique called chopper stabilization or chopper, where the amplifier offset voltage is reduced.
Is flicker noise frequency dependent?
Flicker noise and environmental noise are frequency dependent. Thermal noise and shot noise are frequency independent.
How does flicker noise affect instrumental readings?
Flicker noise results from random fluctuations in current and is inversely related to frequency. Flicker noise is overcome by electronically modulating the detector output signal to a higher frequency where less noise is present (i.e. from 102 Hertz to 104 Hertz).
Is flicker noise correlated?
Knowing that flicker noise has a flat autocorrelation function, we attempt to remove it by subtracting two correlated samples. This is known as correlated double sampling (CDS). Knowing that flicker noise is a low-frequency effect, we attempt to modulate it into a frequency band outside the signal band.
Why is flicker noise pink?
Flicker noise is also known as 1/f noise in view of the fact that is power density decreases with increasing frequency or increasing offset from a signal. It follows a 1/f characteristic, having what is termed a pink noise spectrum.
What causes noise in spectroscopy?
Spectrometer noise is caused by mechanical vibrations or environmental electrical fields, for example, from AC power lines. Good mechanical and electrical design principles can drastically reduce these effects.
What are the general types of noise in Spectroscopy?
The relevant types of noise in spectroscopy are: dark current, shot noise, readout noise, stray light, electronic noise.
What is noise in UV VIS Spectroscopy?
The UV VIS spectrometer (PE lambda 25) shows strong noise between 380 and 325 nm. The noise is observed by means of strong absorbance or strong transmission. The attached files show the optical path of the instrument and a spectrum within the wavelength of interest.