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Trace detection of C2H2 using tunable diode laser absorption spectroscopy

Zhiqun Ding, Hongxia Zhao, Xiaohui Fang, Jilong Bao

Open publisher page 3 citations

Abstract

A trace detection of C2H2 system using tunable diode laser absorption spectroscopy (TDLAS) technique is described, which is suitable for monitoring incipient faults in power transformer. In this system, near infrared distribute feedback laser diode (DFB LD) is used as light source, a 0.5m short optical path cell is used as absorbing cell , two InGaAs PIN photo diodes are used as detector. Applying TDLAS technique and Wavelength modulation spectroscopy (WMS) technique, and combining with ARM9S3C2140 processor controlling, the system has been implemented compact and flexible. The concentration monitoring based on TDLAS method is obtained in situ and in real time, and the detected precision is below ppm degree, which can meet the needs for power transformer incipient faults.

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What this paper is about

A trace detection of C2H2 system using tunable diode laser absorption spectroscopy (TDLAS) technique is described, which is suitable for monitoring incipient faults in power transformer. In this system, near infrared distribute feedback laser diode (DFB LD) is used as light source, a 0.5m short optical path cell is used as absorbing cell , two InGaAs PIN photo diodes are used as detector. Applying TDLAS technique and Wavelength modulation spectroscopy (WMS) technique, and combining with ARM9S3C2140 processor controlling, the system has been implemented compact and flexible. The concentration monitoring based on TDLAS method is obtained in situ and in real time, and the detected precision is below ppm degree, which can meet the needs for power transformer incipient faults.

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Available abstract

A trace detection of C2H2 system using tunable diode laser absorption spectroscopy (TDLAS) technique is described, which is suitable for monitoring incipient faults in power transformer. In this system, near infrared distribute feedback laser diode (DFB LD) is used as light source, a 0.5m short optical path cell is used as absorbing cell , two InGaAs PIN photo diodes are used as detector. Applying TDLAS technique and Wavelength modulation spectroscopy (WMS) technique, and combining with ARM9S3C2140 processor controlling, the system has been implemented compact and flexible. The concentration monitoring based on TDLAS method is obtained in situ and in real time, and the detected precision is below ppm degree, which can meet the needs for power transformer incipient faults.

Key concepts: Tunable diode laser absorption spectroscopy, Materials science, Diode, Optoelectronics, Laser, Tunable laser, Spectroscopy, Absorption spectroscopy

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