A new detection method used to calibrate Fabry–Perot interferometers in the infrared range
作者:
M. Talvard,
C. Javon,
M. Garcin,
D. Thouvenin,
期刊:
Review of Scientific Instruments
(AIP Available online 1994)
卷期:
Volume 65,
issue 3
页码: 567-574
ISSN:0034-6748
年代: 1994
DOI:10.1063/1.1145119
出版商: AIP
数据来源: AIP
摘要:
Fabry–Perot interferometers are routinely used in the Tore Supra tokamak in order to measure the time evolution of the electron temperature of the confined plasmas. Calibration of such interferometers requires the detection of very low dc levels (0.1 nV) with signal‐to‐noise ratios less than 10−5, which is generally not compatible with standard detection methods. A new correlation method is proposed to achieve this absolute calibration. It is based on a proper noise autocorrelation technique combined with an optimized filtering involving Fourier analysis. The advantages of the method are detailed and experimentally compared to standard averaging techniques, such as coherent addition and synchronous detection. The method can be used in a more general context every time very small amplitude signals are to be measured.
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