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介绍了利用钛宝石可调谐激光器、倍频器和单波长激光器作为光源,在24个波长分立点定标了三个硅陷阱探测器的绝对光谱响应度,解决了红外激光的精确定位与调整、窗口透过率模拟定标等关键技术.结果显示:在激光波长为412—800nm时,三个陷阱探测器定标的不确定度约低于0.05%;当激光波长大于800nm以及低于355nm时,获得的陷阱探测器的定标不确定度约低于0.065%.硅陷阱探测器可以作为空间各类遥感器在350—1064nm波段定标的传递标准探测器.
关键词:
陷阱探测器
低温辐射计
光谱响应度
辐射定标 相似文献
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光谱响应度是探测器的重要技术参数之一,随着红外探测技术的发展,精确测量红外探测器的光谱响应度变得越来越重要。首先对红外探测器光谱响应度的测试技术进行分析,然后建立红外探测器相对光谱响应度测量装置,并用腔体热释电探测器在该装置上进行红外探测器光谱响应度校准实验。通过对红外探测器相对光谱响应度进行重复测量,给出测量结果的平均值,最后对影响测量结果的不确定度进行分析。由于该装置的测量范围是1~20μm,因此还可以实现InSb探测器和HgCdTe探测器相对光谱响应度的测量。不确定度分析结果表明,InGaAs探测器光谱响应度的测量精度较高。 相似文献
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Optical properties of the silicon photodiodes are investigated in the visible spectral regime. Non-linearity measurement standard was established by using Hamamatsu S1337-11 type windowless silicon photodiode whose non-linearity value was found to be better than 6×10−5 at photocurrent level of 10−9 to 10−4 A. Temperature effects on the spectral responsivity for S1337-11, S1337-1010BQ and S1227-1010BQ type photodiodes were analyzed between 20°C and 40°C at 488.1, 514.7 and 632.8 nm vacuum wavelengths. The spatial uniformities of the responsivity for three type photodiodes are performed with a laser beam having 1 mm diameter by using home made two-axis micro translation system. Results of the reflectance measurements for three elements of reflection-based trap detectors were compared with the predicted values obtained from Fresnel equations. 相似文献
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The luminous intensity unit of candela was realized based on filter-radiometer, which is traceable to detector-based primary standard electrical substitution cryogenic radiometer (ESCR). In that realization the traditional Osram Wi41/G-type incandescent lamp and filter-radiometer consisting of an aperture, a V(λ) filter and a silicon photodiode based trap detector were used as light source and detection element, respectively. Measurement techniques of effective aperture area, spectral transmittance of V(λ) filter and absolute responsivity of trap detector are also presented. 相似文献
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红外焦平面成像器件的光谱响应率是天基红外遥感的基本物理指标。为了准确应用该项参数去除器件在制造工艺中的不均匀性对产品质量的影响,必须在系统使用之前对其重新标定,获取真实值。总结了目前较为普遍的IRPFA产品光谱响应率标定方法,通过比较选择标准代替法对产品进行标定。根据所得到测量数据,分析了其可能存在的误差,总结了在对IRPFA产品进行标定时应注意的问题。同时提出了一种调整积分时间的方法,以弥补有些波段标定黑体辐射功率过低带来误差过大的缺陷。 相似文献
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The measurement accuracy in the photometric quantities measured through photometer head is determined by the value of the spectral mismatch correction factor (c(St,Ss)), which is defined as a function of spectral power distribution of light sources, besides illuminance responsivity of the photometer head used. This factor is more important when photometric quantities of the light-emitting diode (LED) style optical sources, which radiate within relatively narrow spectral bands as compared with that of other optical sources, are being measured. Variations of the illuminance responsivities of various V(λ)-adopted photometer heads are discussed. High-power-colored LEDs, manufactured by Lumileds Lighting Co., were used as light sources and their relative spectral power distributions (RSPDs) were measured using a spectrometer-based optical setup. Dependences of the c(St,Ss) factors of three types of photometer heads (f1′=1.4%, f1′=0.8% and f1′=0.5%) with wavelength and influences of the factors on the illuminance responsivities of photometer heads are presented. 相似文献
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S. Marchetti P. Sandri R. Simili 《International Journal of Infrared and Millimeter Waves》1997,18(7):1395-1409
In this work we report a complete theory of the metal-insulator-metal, antenna coupled, mm and sub-mm detectors. The voltage-power
responsivity is simply derived from the geometrical antenna proprieties and the electrical junction characteristics. The calculated
responsivity simply foresees our experimental results in the sub-mm — mm range and well fits all the previously reported data 相似文献
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S. Marchetti P. Sandri R. Simili 《International Journal of Infrared and Millimeter Waves》1997,18(11):2161-2175
In this work we report a complete theory of the metal-insulator-metal, antenna coupled, mm and sub-mm detectors. The voltage
-power responsivity is simply derived from the geometrical antenna proprieties and the electrical junction characteristics.
The calculated responsivity simply foresees our experimental results in the sub-mm — mm range and well fits all the previously
reported data 相似文献
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R P Sharma 《Pramana》1988,31(3):185-195
Fabrication methods for silicon surface barrier detectors and their correlated properties which result in the production of
high resolution (< 20 keV) devices have been studied. The techniques for fabrication and testing of the detectors currently
employed at our Centre are presented. An FWHM of 14keV for 5·486 MeV241Am α has been achieved. Our results are therefore comparable with the best in the world. 相似文献
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In UME, the relative spectral responsivity scale extending from 250 to 2500 nm was realized using electrically calibrated pyroelectric radiometer (ECPR). Its absolute spectral responsivity was determined against the electrical substitution cryogenic radiometer (ESCR) facility at 488.1, 514.6, 532.0, and 632.8 nm with an uncertainty of 1 part in 104 (k=2). The relative spectral responsivity scale of ECPR was derived from the surface reflectance data and absolute spectral responsivity data for the mentioned spectral range. Optical characterization of its spatial non-uniformity (at 632.8 nm) and surface reflectance (over 250–2500 nm wavelength region) indicated that the gold-black absorber is spectrally flat within 0.1%. The total expanded uncertainty in the realization of the mentioned radiometric scale along with ECPR was estimated as 1.74%. 相似文献
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光电探测器相对光谱灵敏度测试方法的研究 总被引:2,自引:1,他引:2
本文在全面比较了各类光电器件相对光谱灵敏度S(λ)_r的基础上,设计了用热释电探测器作参考基准,用积分球作单色光辐射接收系统的S(λ)_r测量系统.由于设计上的优点,这一系统大大减少了入射辐射的偏振性,不均匀性,探测器的温漂和杂散辐射等因素带来的误差. 相似文献
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A new approach for lithium drifting in silicon is described where the silicon devices under drift are held at constant temperature
and bias at normal air ambient, and the drift process is terminated at the end of an estimated time depending upon the thickness
of wafers. A 4-channel lithium drifting unit with electronically controlled oven has been constructed for this purpose. Full
details of the fabrication procedure are given. A sizable number of Si(Li) detectors have been fabricated using this approach.
The quality of the detectors is tested with241Am alphas and conversion electrons from209Bi and137Cs sources. The detectors are regularly used for nuclear physics experiments at this Centre. 相似文献
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Numerous radon measurements are carried out using silicon detectors directly in the environment. This new kind of alpha radiation measurement has been developed because the reduced cost makes it possible to replace the usual plastic track detectors. At our laboratory, an alpha particle detector has been designed from a commercial silicon photodiode. This type of detector can determine the device response perfectly in any kind of environment. Different spectrum analyses have been conducted in the laboratory and field to define the exact origin of counted alpha particles. We studied the response for different radon and thoron concentration levels and observed the energy of the detected alpha particles. We carried out some of these experiments with gas flux, and some without, to show the effects of interactions with surfaces to obtain thermodynamic equilibrium in the detection chamber. Finally, the silicon diodes that we tested measure the alpha particles of the decay products (polonium) from the radon and the thoron, but very weakly from the gases themselves. Thus, it is possible to make mistakes when measuring the radon if the count of alpha particles is performed without spectrum analysis. One reason for this is that the decay progenies of the radon are solid radio-elements with thermodynamic proprieties different from gases. 相似文献
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We report studies of decoherence and spectral hole burning for the 794 nm optical transition of thulium-doped lithium niobate. In addition to transient spectral holes due to the 3H4 and 3F4 excited states of Tm3+, persistent spectral holes with lifetimes of up to minutes were observed when a magnetic field of a few hundred Gauss was applied. The observed anti-hole structure identified the hole burning mechanism as population storage in the 169Tm nuclear hyperfine levels. In addition, the magnetic field was effective in suppressing spectral diffusion, increasing the phase memory lifetime from 11 μs at zero field to 23 μs in a field of 320 Gauss applied along the crystal’s c-axis. Coupling between Tm3+ and the 7Li and 93Nb spins in the host lattice was also observed and a quadrupole shift of 22 kHz was measured for 7Li at 1.7 K. A Stark shift of 18 kHz cm/V was measured for the optical transition with the electric field applied parallel to the c-axis. 相似文献
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Developing new resonant optical materials for spatial-spectral holography and quantum information applications requires detailed knowledge of the decoherence and population relaxation dynamics for the quantum states involved in the optical transitions, motivating the need for fundamental material studies. We report recent progress in studying these properties in erbium-doped lithium niobate at liquid helium temperatures. The influence of temperature, applied magnetic fields, measurement timescale, and dopant concentration were probed using photon echo spectroscopy and time-resolved spectral hole burning on the 1532 nm transition of Er3+:LiNbO3. Effects of spectral diffusion due to interactions between Er3+ ions and between the Er3+ ion and 7Li and 93Nb nuclear spins in the host lattice were observed. In addition, long-lived persistent spectral storage of seconds to minutes was observed due to non-equilibrium population redistribution among superhyperfine states. 相似文献
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利用大气光学质量和大气气溶胶光学厚度的经验公式,由HITRAN数据库获得大气分子谱线参数,基于辐射传输方程,给出了晴朗无云天空光谱辐射的近似计算模型。根据该近似计算模型对晴朗无云天空光谱辐射亮度进行的计算结果表明:天空光谱辐射亮度曲线上存在明显的O2和H2O吸收线;晴朗无云天空辐射的光谱分布偏蓝,天空亮度主要集中在短波段部分;太阳角小的天空光谱亮度出现“红移”现象;由于大气厚度变大,近地平的天空辐射亮度较大。 相似文献