Chinese Academy of Sciences

Xinjiang Technical Institute of Physics and Chemistry, Cas

Yuqiang Yang

Yu Chen Zhou

Shilie Pan

Xiaoming Duan

Yingjie Shen

Linjun Li

Xin He

Qianqian Hao

Fangfang Zhang

A laser fusion welding device includes a 1.9 μm laser light source, a control unit and a light spot adjusting device. The control unit is configured to control the laser light source and the light spot adjusting device to adjust a laser power density at an object to be subjected to fusion welding. The 1.9 μm laser light source has output power of 100-500 W. The control unit includes a time control unit, a power control unit and a light spot control unit. The time control unit is configured to control a turn-on time of the laser light source. The power control unit is configured to control the output power of the laser light source. The light spot control unit is configured to control the light spot adjusting device to adjust a size of a light spot at the object to be subjected to fusion welding.

Laser fusion welding device

A method for measuring concentrations of multiple gases by using an infrared band laser light includes: pumping Ho crystal by using a 1.9 &#x3bc;m single thulium-doped solid-state laser to obtain a 2 &#x3bc;m band near-infrared laser output; controlling a light-emitting angle of 2 &#x3bc;m band laser light; allowing the 2 &#x3bc;m laser light to enter a first measurement cell at a first emergent angle, and measuring a concentration of methane gas in the first measurement cell; generating and introducing the 3-5 &#x3bc;m mid-infrared laser light into a second measurement cell to measure concentrations of ammonia gas and carbon monoxide in the second measurement cell; generating and introducing the 6-12 &#x3bc;m far-infrared laser light into a third measurement cell to measure concentrations of carbon dioxide, acetylene, ethylene and ethane gas in the third measurement cell.

Method for measuring concentrations of multiple gases by using infrared band laser light

A fiber optic sensing head includes a single-mode optical fiber, a twin hole optical fiber including a cladding region and a core region surrounded by the cladding region, and the core region includes a second core located at an axis center, as well as a first and second round holes symmetrically distributed with respect to the second core; an incoming end of a gradient refractive-index fiber is connected to an outgoing end of the twin hole optical fiber with the incoming end of the gradient index fiber aligned with the outgoing end of the single-mode optical fiber at center. A thermal-sensitive structure is filled in a preset length part of the second round hole extending along an axial direction of the twin hole optical fiber. An incoming end of the twin hole optical fiber is connected to an outgoing end of the gradient index optical fiber with displacement.

Temperature sensor based on twin hole optical fiber

Growing community of inventors

Urumqi, China

Yuqiang Yang