dorsal/arxiv
View SchemaFast convergence of white noise cross-correlation measurement archived by vector average in both frequency and time domain
| Authors | Jian Wei |
|---|---|
| Categories | |
| ArXiv ID | physics/0405041 |
| URL | https://arxiv.org/abs/physics/0405041 |
Abstract
White noise measurement can provide very useful information in addition to normal transport measurements. For example thermal noise measurement can be used at sub Kelvin temperature to determine the absolute electron temperature without applying any heating current. And shot noise measurements helped to understand the properties of nano and mesoscopic normal metal/superconductor structures. But at low temperature and for relatively small resistance it is difficult to measure the sample's noise magnitude because the background thermal noise can be much larger and usually there are other pick-up noises. Cross correlation technique is one way to solve this problem. This article describes an improved cross correlation algorithm that averages in both frequency and time domain, and the realization of a simple instrument set-up with PC and sound card. With this set-up it is shown even with much larger background noise and pickup noises, 100pV/$\sqrt{Hz}$ white noise level can be easily measured in seconds. Compared to the normally used cross-correlation methods, it is several orders of magnitude faster.
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"date_created": "2026-03-02T18:00:50.253000Z",
"date_modified": "2026-03-02T18:00:50.253000Z",
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"abstract": "White noise measurement can provide very useful information in addition to\nnormal transport measurements. For example thermal noise measurement can be\nused at sub Kelvin temperature to determine the absolute electron temperature\nwithout applying any heating current. And shot noise measurements helped to\nunderstand the properties of nano and mesoscopic normal metal/superconductor\nstructures. But at low temperature and for relatively small resistance it is\ndifficult to measure the sample\u0027s noise magnitude because the background\nthermal noise can be much larger and usually there are other pick-up noises.\nCross correlation technique is one way to solve this problem. This article\ndescribes an improved cross correlation algorithm that averages in both\nfrequency and time domain, and the realization of a simple instrument set-up\nwith PC and sound card. With this set-up it is shown even with much larger\nbackground noise and pickup noises, 100pV/$\\sqrt{Hz}$ white noise level can be\neasily measured in seconds. Compared to the normally used cross-correlation\nmethods, it is several orders of magnitude faster.",
"arxiv_id": "physics/0405041",
"authors": [
"Jian Wei"
],
"categories": [
"physics.ins-det"
],
"title": "Fast convergence of white noise cross-correlation measurement archived by vector average in both frequency and time domain",
"url": "https://arxiv.org/abs/physics/0405041"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "013747f8-0dee-4bb5-b293-92f873f22bd1",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
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