Journal
SENSORS
Volume 22, Issue 22, Pages -Publisher
MDPI
DOI: 10.3390/s22228919
Keywords
spectroscopy; FTIR; cross-correlation; SNR; photoreceiver
Funding
- [UGB-22/732]
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This paper demonstrates the performance of a low-noise optical sensor for an FTIR spectrometer. By reducing uncorrelated noise components, the sensor achieves a higher signal-to-noise ratio and lower signal standard deviation.
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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