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Optical Fiber Instrument for Single-point Multi-parameter Measurement 被引量:1
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作者 WANGYu-tian WANGXiao-dong 《Semiconductor Photonics and Technology》 CAS 2001年第4期221-224,共4页
A novel kind of optical fiber instrument for two channel measurement of temperature and displacement was developed. Four channel quartz fiber optics were employed to measure two channel signals of temperature and disp... A novel kind of optical fiber instrument for two channel measurement of temperature and displacement was developed. Four channel quartz fiber optics were employed to measure two channel signals of temperature and displacement simultaneously, and the operating efficiency of this instrument was greatly improved. 展开更多
关键词 Fiber optics TEMPERATURE DISPLACEMENT
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Novel Portable Oil Ingredient Instrument with Optical Fiber Link
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作者 WANGShu-tao SHIJin-shan 《Semiconductor Photonics and Technology》 CAS 2001年第2期109-113,119,共6页
The operation principle of a novel portable oil ingredient instrument is introduced. Using the theory of fluorescence measurement, this instrument can carry out fast and consecutive in-situ detection of oil ingredient... The operation principle of a novel portable oil ingredient instrument is introduced. Using the theory of fluorescence measurement, this instrument can carry out fast and consecutive in-situ detection of oil ingredient in sea water, confirming fast and correctly the situation of oil contamination such as the concentration and the area, etc. The lowest detectable concentration for the instrument is 1×10 -8 g/ml with the precision of less than 3 %. The results of experiment and practice show that this system has well water-sealed characteristic and repeatability. 展开更多
关键词 Fluorescence measurement Excitation spectrum Fluorescence spectrum Optical fiber
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Symmetric Temperature Compensation for Photoelectric Coupling Current Transducer
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作者 SHANGHong-yan Zhong-Jia-qing 《Semiconductor Photonics and Technology》 CAS 2001年第4期230-234,共5页
The temperature characteristic of sensor probe at high voltage side is analyzed by using a photoelectric coupling current transducer. The principle of symmetric temperature compensation and the main idea of software d... The temperature characteristic of sensor probe at high voltage side is analyzed by using a photoelectric coupling current transducer. The principle of symmetric temperature compensation and the main idea of software design are proposed. The method increases measuring precision and has fairly great practicability. 展开更多
关键词 Current transducer Sensor probe Temperature compensation
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Positioning Error of Optoelectronic Telescope Compensated by Bipolar PWM Driving Mode
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作者 LIXiao-yan ZHOUHui +1 位作者 FUHong HOUYun-hai 《Semiconductor Photonics and Technology》 CAS 2005年第2期139-141,共3页
The optoelectronic telescope has two sets of control systems: azimuth one and elevation one, and both are driven by PWM power amplifier with high efficiency and wide speed regulation range. The diagram of the azimuth ... The optoelectronic telescope has two sets of control systems: azimuth one and elevation one, and both are driven by PWM power amplifier with high efficiency and wide speed regulation range. The diagram of the azimuth control system is demonstrated, the nonlinear factors is analyzed at low speed, and some related experiments are carried out. The results show that the positioning error with unipolar is 86 codes(106.21″), while 18 codes (22.23″) is with bipolar PWM driver. 展开更多
关键词 TELESCOPE TRACKING POSITIONING PWM driving mode
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Novel Fiber Optic Fluorometer for the Measurement of Alga Concentration
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作者 WANGShu-tao SHIJin-shan 《Semiconductor Photonics and Technology》 CAS 2001年第3期172-176,共5页
A novel fluorometer based on fiber optics is briefly introduced for the measurement of alga concentration. Both the exciting light and the fluorescence from alga chlorophyll are transmitted along a fiber cable. By thi... A novel fluorometer based on fiber optics is briefly introduced for the measurement of alga concentration. Both the exciting light and the fluorescence from alga chlorophyll are transmitted along a fiber cable. By this way, we can get alga concentration by measuring its chlorophyll a fluorescence intensity. The experiment results show that this instrument is characterized by good sensitivity, linearity and accuracy. 展开更多
关键词 Fiber optics Fluorescence techniques Chlorophyll a
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Layer Combination Effect on Band Gap Shift of InGaAsP/InP MQWs by Impurity-free Vacancy Disordering
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作者 ZHAOJie WANGYong-chen +1 位作者 FENGZhe-chuan FergusonI 《Semiconductor Photonics and Technology》 CAS 2004年第2期73-77,85,共6页
InGaAsP/InP multiple quantum wells with quantum well intermixing have been prepared by impurity-free vacancy disordering.The luminescent characteristics were investigated using photoluminescence and photoreflectance,f... InGaAsP/InP multiple quantum wells with quantum well intermixing have been prepared by impurity-free vacancy disordering.The luminescent characteristics were investigated using photoluminescence and photoreflectance,from which the band gap blue shift was observed.Si3N4,SiO2 and SOG were used for the dielectric layer to enhance intermixing from the outdiffusion of group III atoms.All samples were annealed by rapid thermal annealing.The results indicate that the band gap blue shift varies with the dielectric layers and the annealing temperature.The SiO2 capping with an InGaAs cladding layer was successfully used to induce larger band tuning effect in the InGaAsP/InP MQWs than the Si3N4 capping with an InGaAs cladding layer.On the other hand, samples with the Si3N4-InP cap layer combination also show larger energy shifts than that with SiO2-InP cap layer combination. 展开更多
关键词 Molecular beam epitaxy Quantum well Optical properties Indium phosphide INGAASP
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