Weak infrared radiation intensity measurement based on extended Duffing oscillator

Yongming Zhao; Jian Du; Xin Wang; Chang Liu; Zhuo Li; Yan Hao

doi:10.1117/12.2607126

24 November 2021 Weak infrared radiation intensity measurement based on extended Duffing oscillator

Yongming Zhao, Jian Du, Xin Wang, Chang Liu, Zhuo Li, Yan Hao

Proceedings Volume 12061, AOPC 2021: Infrared Device and Infrared Technology; 120611U (2021) https://doi.org/10.1117/12.2607126
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

Measurement of infrared radiation with low intensity in level of 10⁻⁶ W / cm² is difficult. Because both background and the components used in the measurement system will generate infrared radiation, which results in a low signal-to-noise ratio (SNR). Except of using photodetector with high sensitivity, weak signal processing method is crucial. In this paper an infrared radiation intensity measurement setup based on intercomparison method is introduced. A reflective chopper is used to modulate the detected infrared radiation. By using a MCT Detector with Dewar the infrared signal is transferred to electric signal. To process the weak modulated signal with strong noise an extended Duffing oscillator is introduced. Both amplitude and phase of the modulation signal with known frequency is obtained by step-time-delay technique (equivalent to phase shifting in frequency-domain). The measurement error can be maintained below 16.1% even when the SNR is as low as -67 dB. The corresponding received infrared radiation power is only 1.05×10^-9 W. The proposed signal processing method shows superior ability and great potential applications compared with commonly used method, such as lock-in amplification.

Citation Download Citation

Yongming Zhao, Jian Du, Xin Wang, Chang Liu, Zhuo Li, and Yan Hao "Weak infrared radiation intensity measurement based on extended Duffing oscillator", Proc. SPIE 12061, AOPC 2021: Infrared Device and Infrared Technology, 120611U (24 November 2021); https://doi.org/10.1117/12.2607126

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