Gas detection system using intracavity fiber laser with loop cavity having saturated absorption fiber

US9029819B2 · kind B2 · utility

Assignee

• Beijing information Science & Technology University · CN

Inventors

• Lianqing Zhu · Beijing, CN
• Fei Luo · Somerville, US
• Mingli Dong · Beijing, CN
• Wei He · Beijing, CN
• Yinmin Zhang · Beijing, CN
• Xiaochen Meng · Beijing, CN
• Zhehai Zhou · Beijing, CN

Key dates

• Filing date: Oct 8, 2014
• Grant date: May 12, 2015
• Expiry date: Oct 8, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2021/391
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A gas detection system with an inner ring cavity fiber laser using saturated absorption optical fiber is provided. The system comprising a ring fiber laser consisted of a pump source, a wavelength division multiplexer, a first active optical fiber, a first coupler, a fiber Bragg grating and a second coupler connected successively; an optical isolator coupled between said first active optical fiber and said first coupler; a second active grating connected between said fiber Bragg grating and said first coupler; a detection gas chamber connected between said first coupler and said second coupler; a first photoelectric detector for detecting the laser intensity outputted from said ring fiber laser to generate a first light intensity signal; a second photoelectric detector for receiving the intensity measuring beam passing through the detection gas chamber to generate a second light intensity signal; and a feedback control unit.