关键词：光机电；传感器；铵荧光；视图

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关键词：光机电；传感器；法布里珀罗干涉；银薄膜

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This thesis investigates the feasibility of adapting the Microflown PU match vector sensor for underwater use. After testing the proper functioning of the sensor, the best materials for the capsule are determined based on acoustic properties. The capsule is designed and built by NPS staff. To predict the sensitivity of the encapsulated sensor, the characteristic equations are modified to reflect the new medium. In order to be able to predict the sensitivity of the encapsulated sensor, the performance ratio is determined between the sensitivity in air and the filling fluid of choice. Temperature dependency is introduced in the relevant parameters to be able to model the sensitivity at various operating temperatures. The measured sensitivity from the calibration report is then used to predict its performance in castor oil. The theoretical sensitivity model is verified by experimental data gathered from calibration studies at NUWC. The verified model is then used to analyze the consequences of changing critical operating parameters like the distance between the filaments and the operating temperature. Based on these calculations, recommendations are made for a better performing prototype. Eventually a new design is proposed that increases sensitivity significantly and is better adapted to operate in the filling fluid.

关键词：光机电；传感器；微流矢量；水下

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This chapter addresses the problem of selecting optimal observation points for scanning networks in view of a combinatorial optimization approach. In the existing formulations, an optimal sensor activation schedule is computed as that which globally minimizes a criterion directly connected with the expected quality of the parameter estimates. But then the key difficulty becomes the large scale of the resulting global optimization problem, since the monitoring networks encountered in process industry or environmental engineering may often consist of several hundreds of stations. Obviously, this makes the exhaustive search on a candidate-by-candidate basis practically intractable and creates a need for techniques which would implement guided search and have acceptable performance.

关键词：光机电；传感器；激活；组合

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In October 2010, the Joint Research Centre (JRC), Institute of Energy and Transport (IET) and the U.S. Department of Energy (DOE) National Renewable Energy Laboratory (NREL) signed a Memorandum of Agreement (MOA) to formalize collaborations in specific Thematic Areas both parties agreed to. The terms of the technical program (aims, means, and deliverables) were detailed in Technical Annexes appended to the MOA. Technical Annex 1 was titled Hydrogen Sensor Performance, Testing and Evaluation. As part of the MOA, each party established a Steering Committee to guide cooperative activities implemented under the MOA. The Steering Committee meets once a year to review the cooperative activities implemented, to evaluate their effectiveness, and to develop plans. The first Steering Committee meeting was held by videoconference on 22 September 2011; the second meeting is scheduled for 3 December 2012. The MOA was to be in effect for two years and subject to renewal. This report summarizes the joint activities undertaken within the framework of the MOA on hydrogen sensor performance testing.

关键词：光机电；传感器；氢；性能测试

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In 2009/2010 NASA developed Technology Roadmaps.Technology Area 8 was Science Instruments, Observatories & Sensors Systems (SIOSS).SIOSS included:Technology Area Breakdown Structure (TABS);Key Technical Challenges;Roadmaps for Each Level 1 TABS.

关键词：光机电；传感器；天文台；NRC技术路线图

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In Section 2.2.5.4 it was indicated that, in general, for nonlinear parametriza-tion of the system responses, optimum experimental conditions strongly depend on the unknown parameter values which only have to be estimated. This causes one of the main complications related to the determination of optimal experimental conditions. A common approach is then to design the experiment for some reasonable nominal parameter values whose knowledge is a prerequisite for applying the locally optimal sensor location methods described in the previous chapters. Since the uncertainty of those nominal values is not taken into account, practical application of such procedures is limited to situations when system responses change slowly in the set of admissible parameters.

关键词：光机电；传感器；位置参数；不确定性

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This document is a final report for the polyvinyl toluene (PVT) neutron-gamma (PVT-NG) project, which was sponsored by the Domestic Nuclear Detection Office (DNDO). The PVT-NG sensor uses PVT detectors for both gamma and neutron detection. The sensor exhibits excellent spectral resolution and gain stabilization, which are features that are beneficial for detection of both gamma-ray and neutron sources. In fact, the ability to perform isotope identification based on spectra that were measured by the PVT-NG sensor was demonstrated. As described in a previous report, the neutron sensitivity of the first version of the prototype was about 25less than the DNDO requirement of 2.5 cps/ng for bare Cf-252. This document describes design modifications that were expected to improve the neutron sensitivity by about 50relative to the PVT-NG prototype. However, the project was terminated before execution of the design modifications after portal vendors demonstrated other technologies that enable neutron detection without the use of He-3. Nevertheless, the PVT-NG sensor development demonstrated several performance goals that may be useful in future portal designs.

关键词：光机电；传感器；PVT-NG

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The U.S. Department of Energy (DOE) and Lockheed Martin Space Systems Company (LMSSC) have been developing the Advanced Stirling Radioisotope Generator (ASRG) for use as a power system for space science missions. This generator would use two high-efficiency Advanced Stirling Convertors (ASCs), developed by Sunpower, Inc., and NASA Glenn Research Center. The ASCs convert thermal energy from a radioisotope heat source into electricity. As part of ground testing of these ASCs, different operating conditions are used to simulate expected mission conditions. These conditions require achieving a particular operating frequency, hot-end and cold-end temperatures, and specified electrical power output for a given heat input. It is difficult to measure heat input to Stirling convertors due to the complex geometries of the hot components, temperature limits of sensor materials, and invasive integration of sensors. A thin-film heat flux sensor was used to directly measure heat input to an ASC. The effort succeeded in designing and fabricating unique sensors, which were integrated into a Stirling convertor ground test and exposed to test temperatures exceeding 700 C in air for 10,000 hr. Sensor measurements were used to calculate thermal efficiency for ASC-E (Engineering Unit) No. 1 and No. 4. The post-disassembly condition of the sensors is also discussed.

关键词：光机电；传感器；斯特林转换器；热流测量

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In this chapter, some results related to the interpretation and use of data in DPS diagnostics using sensor networks with mobile nodes were presented. Specifically, theoretical research was carried out and computationally efficient methods to determine optimal configurations of mobile sensor networks for contaminating source detection and estimation were developed. What is more, proper implementation and testing of the computer code for verification of the proposed approach were done based on simulations. The key assumption made here was that the paths of the moving sources were unknown, but they were sufficiently smooth to be approximated by combinations of given basis functions. Parametrization of the source trajectories made it possible to reduce the source detection and estimation problem to that of parameter identification. In order to estimate the source and medium parameters, the maximum-likelihood estimation was used.

关键词：光机电；传感器；故障诊断；离散

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