检索结果-南通市图书馆

A Fiber Optic temperature Sensor Based on the Combination of Epoxy and Glass Particles With Different Thermo-Optic Coefficients

在线全文

学校读者我要写书评

暂无评论

Photonic sensors 2016年第4期6卷 295-302页

作者： Wolfgang WILDNER Dietmar DRUMMER Institute of Polymer Technology Friedrich-Alexander-University Erlangen-Niirnberg Erlangen Germany

This paper describes the development and function of an optical fiber temperature sensor made out of a compound of epoxy and optical glass particles. Because of the different thermo-optic coefficients of these materials, this compound exhibits a strong wavelength and temperature dependent optical transmission, and it therefore can be employed for fiber optic temperature measurements. The temperature at the sensor, which is integrated into a polymer optical fiber （POF）, is evaluated by the ratio of the transmitted intensity of two different light-emitting diodes （LED） with a wavelength of 460nm and 650rim. The material characterization and influences of different sensor lengths and two particle sizes on the measurement result are discussed. The temperature dependency of the transmission increases with smaller particles and with increasing sensor length. With glass particles with a diameter of 43 Bm and a sensor length of 9.8 mm, the intensity ratio of the two LEDs decreases by 60% within a temperature change from 10℃ to 40℃.

关键词： temperature sensors fiber optic sensors epoxy glass particles thermo-optic coefficient

High-temperature sensor using a Fabry-Perot interferometer based on solid-core photonic crystal fiber

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2012年第7期10卷 27-29页

作者：张菁孙浩荣强周马玥梁磊徐琴芳赵佩冯忠耀忽满利乔学光 Department of Physics Northwest University

A micro Fabry-Perot interferometer （M-FPI） is constructed by splicing a short section of polarization- maintaining photonic crystal fiber （PM-PCF） to an end-cleaved single-mode fiber with controllable offset. Due to the high effective optical path difference induced by the solid core of the PCF, the M-FPI has an ultrasmall cavity of approximately 110 μm. The temperature sensitivity within a range from 33 ℃ to approximately 600 ℃ is measured to be 13.8 pm/℃, which shows good agreement with the theoretical result. This proposed sensor has the advantages of ultracompact size and high stability. Therefore, it is suitable for various space-limited sensing applications in harsh environments.

关键词： Nonlinear optics Photonic crystal fibers Single mode fibers temperature sensors

Miniature temperature sensor based on optical microfiber

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2013年第11期11卷 17-20页

作者：卫正统宋章启张学亮于洋孟洲 College of Optoelectronic Science and Engineering National University of Defense Technology

Optical microfibers （OMs） are good alternatives in the field of sensing. In this letter, a simple and effective miniature temperature sensor based on OM is proposed and experimentally verified. Using pure water and fiber coating as the OM clad, an additional loss will occur due to the absorption of outer medium. The temperature of the outer environment can be estimated by monitoring the change in additional loss. In the demonstrated experiments, a series of OM with different diameters, waist lengths, and constructions are used as sensing elements. The correlation coefficients between the experimental results and the linear fittings are better than 0.99, and the temperature sensitivity obtained by the linear fittings can achieve -0.151 dB/℃ （in pure water） and -0.405 dB/℃ （covered by fiber coating）. Moreover, higher sensitivity can be obtained by decreasing the diameter, increasing the waist length of the OM, or choosing the proper operating wavelength.

关键词： Coatings Optical fibers temperature sensors

Refractive index and temperature sensing characteristics of an optical fiber sensor based on a tapered single mode fiber/polarization maintaining fiber

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2016年第5期14卷 14-18页

作者：杨在行孙浩刚婷婷刘楠李佳成孟飞乔学光忽满利 School of Physics Northwest University Xi'an Research Institute of Hi-Tech

An evanescent field optical fiber sensor based on a short section of polarization maintaining fiber spliced with a tapered single mode fiber is proposed and experimentally investigated. We mainly focus on the refractive index （RI） and temperature sensing characteristics of this compact device. The transmission spectrum of the resonance wavelength, induced by the interference between the excited low order cladding modes and core modes, shows the quadratic function relationships with RI and linear relationships with temperature. Thus, the proposal of this simple-to-fabricate, compact, and low cost sensor shows its possible potential in the sensitive detection field.

关键词： Evanescent fields Fibers Optical fibers Polarization maintaining fiber Refractive index temperature sensors

Design and Realization of a Portable temperature Sensor Calibrator

在线全文

学校读者我要写书评

暂无评论

Meteorological and Environmental Research 2018年第2期9卷 12-15,19页

作者： Wei Mingming Liu Yushan Zhang Yunhao Jiangxi Provincial Atmospheric Observation and Technology Center Nanchang 330096 China Jiangxi Provincial Meteorological Service Center Nanchang 330096 China Jiangxi Provincial Meteorological Bureau Agency Service Center Nanchang 330096 China

Due to the complex erection environment of various types of automatic stations,the provincial meteorological inspection department is difficult to carry out this work in terms of equipment or staffing. For this reason,a portable temperature sensor calibrator was developed,and it uses semiconductor refrigeration technology to increase and decrease temperature quickly. It uses an intelligent PID temperature controller as a control device to provide a stable temperature environment; it is small,light and easy to operate,and it provides technical support for the calibration of temperature sensors. The structure and working principle of this equipment were analyzed,and its performance was tested. All the indicators could meet the requirements of field calibration. The calibrator will provide a strong guarantee for the reliability of temperature data obtained at automatic meteorological stations.

关键词： Automatic meteorological stations temperature sensors temperature calibration temperature detection

temperature Dependence of Sensitivity of Avalanche Photodiode Based Optical Receiver

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Temperature Dependence of Sensitivity of Avalanche Photodiod...

A Novel Location-Free Greedy Forward Algorithm for Wireless Sensor Networks

2006 10th International Conference on Communication Technology（ICCT 2006）

作者： Ales Prokes Institute of Radio Electronics Brno University of Technology Brno Czech Republic

In the paper, the temperature dependence of the sensitivity of an avalanche-photodiode-based receiver applied in the free space optical communication link is discussed. Communication systems of this type are exposed to a wide range of operating temperatures, which markedly affect many photodiode and preamplifier parameters. The paper describes receiver sensitivity calculation, taking into consideration the temperature dependence of avalanche photodiode gain, excess noise factor, dark current and thermal noise of preamplifier resistances. Presented calculation is demonstrated on the connection of a small-area silicon APD operating in the wavelength range from 820 to 1150 nm with a transimpedance preamplifier using a bipolar junction transistor.

关键词： temperature dependence Avalanche photodiodes Optical receivers Preamplifiers Optical noise Optical fiber communication temperature distribution temperature sensors Dark current Thermal factors

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Novel Location-Free Greedy Forward Algorithm for Wireless ...