Two-Channel Detecting Sensor with Signal Cross-Correlation for FTIR Instruments.
SENSORS (BASEL, SWITZERLAND) 2022;
22:8919. [PMID:
36433515 PMCID:
PMC9694966 DOI:
10.3390/s22228919]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 11/13/2022] [Accepted: 11/16/2022] [Indexed: 06/16/2023]
Abstract
UNLABELLED
This paper's purpose was to demonstrate a performance of a novel approach in a low-noise optical sensor for an FTIR spectrometer.
METHODS
Compared to the standard FTIR detection setup, our sensor ensures a higher signal-to-noise ratio (SNR) and lower signal standard deviation by reducing the uncorrelated noise components (e.g., thermal and 1/f noises of the detection module). Its construction is based on two-channel detection modules and a processing unit with implemented cross-correlation signal analyses. Each module was built of LWIR HgCdTe photodiodes and low-noise transimpedance amplifiers.
RESULTS
the experiments demonstrated a decrease in a signal standard deviation of about 1.7 times with a 10 dB-improvement in the SNR.
CONCLUSION
this result indicates our sensor's main benefit, especially in registered "weak" and noisy interferograms.
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