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Sensitive detection of infrared photons using a high-Q microcantilever   总被引:1,自引:1,他引:0  
A new approach based on microcantilevers is presented to detect infrared photons with high sensitivity. Infrared photons are measured by monitoring the amplitude change of a vibrating microcantilever under light pressure force.The irradiating light is modulated into sinusoidal and pulsed waves,and to be in-phase and anti-phase with the cantilever driving signal.A linear relationship between the amplitude change of the cantilever and the light power distributing on the cantilever was observed.Under a vacuum of 10-4 Pa,an infrared light power of 7.4 nW was detected with the cantilever.The in-phase and anti-phase modulation to the cantilever vibration using a pulsed light results in an enhanced response of the cantilever.  相似文献   
2.
近年来,江苏如东县在农业综合开发项目土建工程招投标中,率先试行单因素价格评标办法,真正体现了公开、公平、公正,杜绝了人情工程,从源头上确保了工程质量。  相似文献   
3.
针对半实物仿真系统的需求,基于系统级封装技术提出了一款由垂直腔面发射激光器(VCSEL)激光器阵列、激光器驱动芯片、电源芯片等组成的微系统,并介绍了基于微机电系统微纳加工技术的VCSEL激光器阵列的制造工艺流程.该激光器的封装方法具有集成度高、可靠性高等特点,相比于其他驱动及封装方法大大提高了驱动效率和空间利用率,因此在光学成像、通信、互联等领域具有广泛应用前景,为实现半实物仿真中激光成像发生器奠定了基础.  相似文献   
4.
提出一种基于微悬臂梁的具有较高灵敏度的新型红外光子探测方法。该方法通过测量振动悬臂梁在光压作用下振幅的变化量来探测红外光子。实验中,将红外辐射光调制成正弦型或方波脉冲,并与微悬臂梁的激励信号保持同相或反相。实验结果表明,微悬臂梁振幅的改变量与红外光功率之间存在线性关系,并在10-4 Pa的真空环境中最小可以探测到7.4 nW的红外光功率,另外还发现,方波脉冲调制光会增大微悬臂梁的振幅响应。  相似文献   
5.
The influence of deposition, annealing conditions, and etchants on the wet etch rate of plasma enhanced chemical vapor deposition (PECVD) silicon nitride thin film is studied. The deposition source gas flow rate and annealing temperature were varied to decrease the etch rate of SiNx:H by HF solution. A low etch rate was achieved by increasing the SiH4 gas flow rate or annealing temperature, or decreasing the NH3 and N2 gas flow rate. Concentrated, buffered, and dilute hydrofluoric acid were utilized as etchants for Sit2 and SiNx:H. A high etching selectivity of Sit2 over SiNx:H was obtained using highly concentrated buffered HE  相似文献   
6.
针对半实物仿真系统的需求,基于系统级封装技术提出了一款由垂直腔面发射激光器(VCSEL)激光器阵列、激光器驱动芯片、电源芯片等组成的微系统,并介绍了基于微机电系统微纳加工技术的VCSEL激光器阵列的制造工艺流程.该激光器的封装方法具有集成度高、可靠性高等特点,相比于其他驱动及封装方法大大提高了驱动效率和空间利用率,因此在光学成像、通信、互联等领域具有广泛应用前景,为实现半实物仿真中激光成像发生器奠定了基础.  相似文献   
7.
A novel cantilever array-based bio-sensor was batch-fabricated with IC compatible MEMS technology for precise liver cancer bio-marker detection. A micro-cavity was designed in the free end of the cantilever for local antibody-immobilization, thus the adsorption of the cancer biomarker takes place only in the local region of the cantilever instead of the whole lever, and the effect of adsorption-induced k variation can be dramatically reduced. These structural features offer several advantages: high sensitivity, high throughput, high mass detection accuracy, and a portable system. In addition, an analytical model has been established to eliminate the effect of the adsorption-induced lever stiffness change and has been applied to the precise mass detection of the cancer biomarker AFP; the experimentally detected AFP antigen mass by the sensor (7.6 pg/mL) is quite close to the calculated one (5.5 pg/mL), two orders of magnitude better than those of the fully antibody-immobilized cantilever sensor. These approaches can promote real applications of the cantilever sensors in cancer diagnosis.  相似文献   
8.
朱银芳 《煤炭技术》2014,(2):173-175
计算机多媒体技术是近年来的新兴技术,其技术的应用领域非常广泛。多媒体技术尤其应用于监控系统中,能够确保在无人监视的情况下,发现问题。煤矿工业是一项安全性要求非常高的行业,因此,监控系统的应用就非常必要。重点分析计算机多媒体技术在煤矿监控系统中的应用。  相似文献   
9.
提出一种采用轮廓波变换和各向异性扩散的图像去噪模型。利用轮廓波变换较好的稀疏性、多方向性等特点,通过对噪声图像经轮廓波变换后的不同尺度上的子带图像进行扩散,并采用P范数方法在轮廓波域计算子带图像的梯度阈值,实现建立在图像精细分析基础上的新的各向异性扩散模型。仿真结果表明,提出的扩散模型较好地抑制了传统各向异性扩散模型出现的边缘模糊效应,在对图像去噪的同时保留了更多的边缘、纹理等细节信息。  相似文献   
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