共查询到19条相似文献,搜索用时 62 毫秒
1.
InGaAs红外探测器的γ辐照研究 总被引:4,自引:0,他引:4
研究了γ射线辐照对InGaAs红外探测器性能的影响。γ射线的辐照剂量分别为10Mrad、20Mrad、30Mrad。测量了器件在不同γ辐照剂量下的响应光谱、电流一电压特性、信号、噪声。通过对实验结果的分析,发现器件的响应光谱和信号没有发生明显变化;暗电流和噪声随γ辐照剂量增加而递增,表明探测器的性能随γ辐照剂量的增加而逐步衰减。 相似文献
2.
空间机械制冷机与红外探测器的耦合技术 总被引:1,自引:0,他引:1
在空间红外遥感中,红外探测器是通过与制冷机的耦合获取冷量的。着重讨论为满足红外探测的需要,如何最大限度地消除空间的振动、电磁干扰等不利因素的影响。同时介绍降低漏热,提高冷量传输效率,从而保证制冷机与红外探测器良好耦合的技术。 相似文献
3.
介绍了我站的红外探测器参数(黑体响应率,噪声、黑体探测率)自动测试系统以及参数测试关键技术的解决分析了这些参数测量不确定度。 相似文献
4.
从红外遥感信息定量化的发展要求出发,分析了测辐射热计、热电堆探测器和热释电探测器的响应特性,选择薄膜热电堆探测器TS-76作为传递标准探测器.搭建高精度光谱响应率定标系统,使用宽波段可调谐激光器和绝对低温辐射计对TS-76探测器的线性、空间均匀性以及重复性进行了标定.按照国际通用不确定度评估规范,对光谱响应率测量结果进行不确定度分析和评估,联合不确定度小于1.5%,并根据实验结果提出实现高精度中远红外辐射定标的技术方案,证明基于热电堆探测器的红外辐射定标技术可以有效缩短标准传递的链路,提高定标的精度. 相似文献
5.
对高温超导测热辐射计在红外热成象研究的应用方面作探索性研究,根据高温超导Boometer的探测机理和噪声理论,设计与之相匹配的电路系统,实现对探测信号的不失真的放大,传输和处理,为高温超导红探测器实用化研究提供实验依据,也获得热成象系统初步探索经验。 相似文献
6.
7.
柴油机低频排气噪声规律分析 总被引:4,自引:0,他引:4
针对柴油机(4-85)低频排气噪声,对其产生机理、规律及其影响因素等作了理论计算、分析及实验。对低频排气噪声信号进行频域分析后可知,其主要由一系列离散的谐波组成,是以柴油机点火频率为基频的一种类周期性噪声,有可能应用有源噪声控制技术。 相似文献
8.
9.
根据控制室噪声治理实例的结果,提出控制室噪声控制和治理的原则、方法和设计方向。通过对主要噪声源分布、构成情况和控制室隔声效果的测定结果,采用成熟的噪声治理技术(减振、隔声与吸声综合措施),使低频噪声环境获得有效治理。检测表明,治理后的环境噪声下降了19dB(SPL),在125Hz峰点处下降26dB。在控制生产性噪声上已取得较好效果,改善了职工的工作环境。针对电厂车间内磨煤机是主要噪声源,其平均噪声强度均大于95dBA的问题,应根据车间噪声水平、场地等情况正确运用建筑声学合理设计,才能有效的提高控制室防护水平。 相似文献
10.
对两种不同结构的中波碲镉汞光导红外探测器件的噪声进行了测量,发现叠层结构器件的低频噪声比具有简单结构器件的大。针对叠层结构,提出了用来分析噪声的边缘接触不对称MIS结构模型。分析表明,叠层电极下的碲镉汞表面在偏置电压作用下,容易出现耗尽层是低频噪声增加的主要原因。 相似文献
11.
Ferre-Pikal ES Walls FL 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》1999,46(1):216-219
We demonstrate regenerative divide-by-two (halver) circuits with very low phase modulation (PM) noise at input frequencies of 18.4 GHz and 39.8 GHz. The PM noise of the 18.4 to 9.2 GHz divider pair was L(10 Hz)=-134 dB below the carrier in a 1 Hz bandwidth (dBc/Hz) and L(10 MHz)=-166 dBc/Hz, and the PM noise of the 39.8 GHz to 19.9 GHz divider pair was L(10 Hz)=-122 dBc/Hz and L(10 MHz)=-167 dBc/Hz. 相似文献
12.
13.
Hartnett JG Tobar ME Ivanov EN 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2001,48(3):743-749
New configurations of interferometric frequency discriminators (FD) for frequency stabilization of microwave oscillators are examined. The new FDs are arranged in single directional (SD) (patented), bidirectional (BD) (patent pending), and dual reflection (DR) (patent pending) configurations. In the SD configuration, the signals reflected off and transmitted through the resonator separately pass through different arms of the interferometer. In the BD configuration, microwaves pass in both directions through each arm of the interferometer. In the DR configuration, microwaves are reflected from the resonator as well as the compensating arm. The FD sensitivity is compared with that for the conventional interferometric FD and found to be 6 dB greater in the BD configuration. Because no circulator is required within the interferometer in either the BD or the DR FD, the discriminator's phase noise floor is not limited by the circulator contribution 相似文献
14.
M. Moreno A. Torres R. Ambrosio E. Torres P. Rosales C. Zuñiga C. Reyes-Betanzo W. Calleja J. De la Hidalga K. Monfil 《Materials Science and Engineering: B》2012,177(10):756-761
In this work we have deposited and characterized pm-Si:H thin films obtained by plasma deposition. Our aim is to use pm-Si:H as thermo-sensing element for infrared (IR) detectors based on un-cooled microbolometers. We have studied the electrical characteristics of pm-Si:H that are figures of merit important for IR detection, as activation energy, thermal coefficient of resistance (TCR), room temperature conductivity (σRT) and responsivity under IR radiation. The influence of the substrate temperature (200 °C and 300 °C) on the pm-Si:H characteristics has been also studied. Our results shown that pm-Si:H is an excellent candidate to be used as thermo-sensing film for microbolometers, due to its large activation energy and TCR, with an improved σRT. 相似文献
15.
16.
17.
Keltner Z Kayima K Lanzarotta A Lavalle L Canepa M Dowrey AE Story GM Marcott C Sommer AJ 《Applied spectroscopy》2007,61(9):909-915
A comparison of prism-based spectrographs to grating-based spectrographs is made when each of the systems is coupled to a modern-day liquid-nitrogen-cooled photovoltaic array detector. A comparison of the systems is also made using a room-temperature microbolometer array detector. Finally, infrared microspectroscopy of samples whose size is approximately 10 micrometers will be demonstrated using a prism spectrograph outfitted with both types of detectors. The results of the study show that prism-based spectrographs offer an economical alternative to grating-based systems when spectral coverage is more critical than spectral resolution. The results also demonstrate that spectra with good signal-to-noise ratios can be collected on any of the systems with a total integration time of 10 seconds or less. 相似文献
18.
19.