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刻纹光纤温度敏感特性的理论与实验研究 总被引:8,自引:1,他引:7
理论分析与实验研究揭示环境温度变化对刻纹光纤中传输的光功率影响极小,表明刻纹光纤不适于直接用于温度传感测量,在应力,应变等传感测量中也可忽视温度的影响。 相似文献
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光纤式表面粗糙度测量仪的研制 总被引:1,自引:0,他引:1
本文论述了光纤表面粗糙度测量仪研制过程中关键问题的解决方法,对非线性特性的参数计算,零点漂移,信号噪声,不同加工表面特性差异的处理都给出了完美的解决方法。该仪器以光散射理论为测量原理,用光纤为传输媒介,并用单片机8098进行计算,数据处理和测量智能控制。 相似文献
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介绍了一种比色光纤快速测温系统。该系统适合于一些特殊环境下的测温要求,解决了传统测温方法无法测量的问题。它可以用于脉冲爆震发动机温度测量,也可以用于铸造,铸造,高频加热以及陶瓷烧结等测量。 相似文献
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《中国测试》2017,(3):83-86
针对传统瞬态温度测试中存在的破坏被测温度场分布、使用寿命短、响应速度低等问题,设计一种基于比色原理的瞬态温度测试系统。介绍系统的结构以及测温原理,为提高整个系统的易用性,对系统进行小型化设计。其中,对滤光片与两象限探测器进行一体化设计,利用单片机完成实验数据的处理以及结果的实时显示,最后对整个系统进行封装。由高温黑体炉对系统进行静态标定来获得系统的静态系数K。在实验室环境中,利用氢氧焰机加热靶体的方式模拟瞬态温度场。同时利用已标定过的比色测温系统以及红外测温仪Modline5测量瞬态温度,在600~1 200℃的测温范围内,两者的误差1%,可以满足瞬态温度测试的要求。 相似文献
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叙述了磷光体的发光机理以及磷光余辉与温关系。通过对磷光体温敏元件与光纤组成的温度传感器的实验研究,提出了一种用单片机控制的实时采集检测系统。 相似文献
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基于普通光纤的分布式温度传感系统 总被引:2,自引:0,他引:2
介绍了一种以标准多模光纤代替高掺锗的特种光纤作为感光纤的分布式光纤温度传感器系统。应用系统进行温度测量取得了较好的实验结果。 相似文献
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一种变折射率光纤温度传感系统的探头研究 总被引:1,自引:0,他引:1
根据光纤包层折射率随温度变化会引起传输光能损耗变化的原理,我们设计了一种光纤温度传感探头,对其物理特性进行了实验研究,得到了具有实用价值的结果。 相似文献
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温度应变同时测量的光纤光栅系统的研究 总被引:2,自引:0,他引:2
为了同时传感温度和应变,在同一根光纤的两个不同地方写入相同的Bragg光栅,设计制成一种特殊机构的传感系统。由于测量结构特殊,两处光纤光栅的反射峰具有成比例的应变响应系数和不同的温度响应,测出温度后,应变也同时算出。实际测量表明,该系统结构简单,测量精度高,能进行实时测量。 相似文献
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G. R. Gathers 《International Journal of Thermophysics》1992,13(1):173-185
A numerical method has been devised to evaluate measurement errors for a three-channel ratio pyrometer as a function of temperature. The pyrometer is simulated by computer codes, which can be used to explore the behavior of various designs. The influence of the various components in the system can be evaluated. General conclusions can be drawn about what makes a good pyrometer, and an existing pyrometer was evaluated, to predict its behavior as a function of temperature. The results show which combination of two channels gives the best precision.Paper presented at the Second Workshop on Subsecond Thermophysics, September 20–21, 1990, Torino, Italy. 相似文献
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Rui Zhang Huaqing Lu Ying Liu Xin Mao Huifeng Wei Jiang Li 《Journal of Modern Optics》2013,60(12):963-969
Fiber optic quarter waveplate (QWP) is widely used in all kinds of optical fiber systems such as fiber sensing systems. Specifically, in fiber optic current sensor (FOCS) system, which is now applied in power grids to measure current and monitor operation, fiber optic QWP is a key device and has serious impact on temperature stability and accuracy of the system. We fabricated a QWP using polarization-maintaining photonic crystal fiber (PM PCF), and studied its impact on the temperature characteristic of a home-made FOCS system. We also made a QWP with conventional polarization-maintaining fiber (PMF) for comparison purposes. The measured system error of the FOCS prototype using a QWP made of PM PCF between ?40°C and 70°C was 8.45‰, which is five times smaller than with a QWP made of conventional PMF. 相似文献
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Susan Zoriasatain 《Journal of Modern Optics》2013,60(10):781-789
Fiber optic sensors, including reflective ones, have widespread applications in sensing technology. In this study, we first formulated the gain of a general reflective fiber optic sensor in terms of five major sensor parameters, and for two patterns of input intensity: namely uniform and Gaussian. By using these formulae, we have analyzed and plotted the variations of gain versus one or two of these parameters. The results obtained have exact compatibility for the two patterns of input intensity, although they have been obtained by different methods. The results can be suitably used in the optimum design of a wide variety of reflective fiber optic sensors. 相似文献
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An optical fiber humidity sensor was fabricated using a hydrophilic gel (agarose) deposited on the tapered plastic optical fiber (POF). The sensing element, agarose, can absorb and exude moisture from/to the ambience, thereby altering its refractive index and changing its ability to modulate the intensity of light that propagates through the fiber. Thus, the operating principle of the sensor is based on the intensity modulation technique, which utilizes a tapered POF probe coated with agarose that is sensitive to humidity. The POF, which was fabricated using an etching method, has a waist diameter of 0.45 mm and tapering length of 10 mm. As the relative humidity varies from 50% to 80%, the output voltage of the sensor with agarose gel of 0.5% weight content decreases linearly from 2.24 mV to 1.55 mV. The agarose-based sensor produces a sensitivity of 0.0228 mV/%, with a slope linearity of more than 98.36%. The tapered fiber with agarose gel of 1% weight content produces a sensitivity of 0.0103 mV/% with a slope linearity of more than 94.95% and a limit of detection of 2.635%, while the tapered fiber with agarose gel of 1.5% weight content produces a sensitivity of 0.0079 mV/% with a slope linearity of more than 98.53% and a limit of detection of 6.853%. The fiber with agarose gel of 0.5% weight content shows higher sensitivity compared to that of 1% and 1.5% due to the effect of pore size, which changes with concentration. The results demonstrate that agarose-based optical fiber sensors are both sensitive and efficient for economical and flexible measurements of humidity. 相似文献
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本文依据普朗克黑体辐射定律,研究了光谱光电高温计的光谱波长和光谱带宽对温度测量准确度的影响,导出了温度测量误差关系式,并在钢铁热处理实验中进行了验证,介绍了减少外界环境对温度测量准确度干扰的几种实用方法,讨论了温度测量的方式所带来的不同测量误差,为钢铁工业测温正确使用光谱光电高温计提供了有用的参考。 相似文献
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A method of determining the temperature dependence of the effective wavelength of a photoelectric pyrometer, intended for
standard operation in realizing a temperature scale by optical methods, is described and results are presented.
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Translated from Izmeritel’naya Tekhnika, No. 9, pp. 52–55, September, 2007. 相似文献
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The processing of multi-wavelength pyrometer data is a problem that needs further improvements. The solutions developed in
earlier decades generally assumed one particular mathematical relation for emissivity versus wavelength in the wavelength
range of the measurements. Sometimes this assumption worked and produced acceptable results, but in many other cases this
approach provided erroneous results. Individual results were strongly dependent on the assumed mathematical relation that
often needed some prior knowledge of the emissivity behavior in the wavelength range. A new data processing method for a multi-wavelength
pyrometer for continuous temperature measurements is presented. A linear relation between emissivity and true temperature
at different wavelengths is assumed. Based on this assumption, the true temperatures and spectral emissivities at the two
continuous temperature measurement points can be simultaneously calculated. Some experimental results for the practical data
processing of measurements performed on a solid propellant rocket engine show that the difference between the calculated true
temperature and the theoretical true temperature indicated by the rocket engine designer is within ±20 K.
Paper presented at the Seventh International Workshop on Subsecond Thermophysics, October 6–8, 2004, Orléans, France. 相似文献