센서학회지 (Journal of Sensor Science and Technology)

  • 제31권2호
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  • Pages.115-119
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  • 2022
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  • 1225-5475(pISSN)
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  • 2093-7563(eISSN)
한국센서학회 (The Korean Sensors Society)
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비접촉 화학작용제 검출기의 MCT 광검출기를 위한 적분기 기반의 리드아웃 회로 구현

Realization of Readout Circuit Through Integrator to Average MCT Photodetector Signals of Noncontact Chemical Agent Detector

  • 박재현 (한국전자기술연구원나노융합연구센터)
  • Park, Jae-Hyoun (Nano Convergence Technology Research Center, Korea Electronics Technology Institute)
  • 투고 : 2021.03.15
  • 심사 : 2022.03.21
  • 발행 : 2022.03.31
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초록

A readout circuit for a mercury-cadmium-telluride (MCT)-amplified mid-wave infrared (IR) photodetector was realized and applied to noncontact chemical agent detectors based on a quantum cascade laser (QCL). The QCL emitted 250 times for each wavelength in 0.2-㎛ steps from 8 to 12 ㎛ with a frequency of 100 kHz and duty ratio of 10%. Because of the nonconstant QCL emission power during on-duty, averaging the photodetector signals is essential. Averaging can be performed in digital back-end processing through a high-speed analog-to-digital converter (ADC) or in analog front-end processing through an integrator circuit. In addition, it should be considered that the 250 IR data points should be completely transferred to a PC during each wavelength tuning period of the QCL. To average and minimize the IR data, we designed a readout circuit using the analog front-end processing method. The proposed readout circuit consisted of a switched-capacitor integrator, voltage level shifter, relatively low-speed analog-to-digital converter, and micro-control unit. We confirmed that the MCT photodetector signal according to the QCL source can be accurately read and transferred to the PC without omissions.

키워드

과제정보

논문은 2022년도 과학기술정보통신부의 재원으로 한국연구재단(NRF)의 R&D 프로그램의 지원을 받아 수행된 연구입니다. [NRF-2020M3D1A2085425, R/G/B 대응 할라이드계 페로브스카이트 소재기반 컬러필터가 필요 없는 적층형 이미지센서 개발 연구]

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