With the widespread application of 3D point clouds in various fields such as remote sensing reconnaissance and intelligent driving, the demand for efficient point cloud processing technology is increasingly growing. T...
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Deformable mirrors play a critical role in adaptive optics systems, and as the precision demands of optical systems continue to rise, the accurate detection of deformable mirror shape and performance becomes essential...
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Recently, human physiological information wireless monitoring in real-time is particularly important in health analysis. As a solution, a non-contact wireless physiological monitoring system based on pyroelectric gene...
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Recently, human physiological information wireless monitoring in real-time is particularly important in health analysis. As a solution, a non-contact wireless physiological monitoring system based on pyroelectric generator(Py G), whose core part consists of a wireless circuit processing module and a polyvinylidene fluoride(PVDF) film, has been successfully designed. Owing to the temperature change under the stimulation of an external heat source, the output voltage of the Py G self-powered flexible sensor increases with the heat source temperature variation in the range of 295–355 K. Furthermore, based on the natural temperature oscillation between the living body and surrounding environment, the sensor can realize human physiological information assessment, for example, temperature monitoring of the palms, fingers, respiratory heat signals from mouth or nose or non-contact spatial heat mapping recognition of finger movement via sensor array. On this basis, a portable wireless monitoring system was designed by integrating the intelligent sensor with a signal conditioning circuit, data conversion storage module, Bluetooth module,and power module. This system can acquire real-time human oral or nasal breathing signals in the personal mobile app to evaluate the physiological state of individuals. Additionally, the wireless monitoring system can be activated within 10 m, demonstrating the application of Py G sensors in remote data transmission.
Large rectangular plane mirrors are widely used in high-power laser systems and synchrotron radiation sources, their surface precision affecting optical system performance. High-precision measurement methods are requi...
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With the rapid development of security surveillance and autonomous driving, the demand for wide field-of-view imaging is increasingly growing. Traditional wide field-of-view (FOV) single-camera systems often suffer fr...
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Low emissivity coatings or thin film materials are currently the main technical means for achieving infrared stealth. Due to the high reflectivity of low emissivity surfaces, environmental radiation such as solar radi...
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ISBN:
(纸本)9781510674547
Low emissivity coatings or thin film materials are currently the main technical means for achieving infrared stealth. Due to the high reflectivity of low emissivity surfaces, environmental radiation such as solar radiation and ground radiation may have a significant impact on the effective infrared radiation of low emissivity surfaces. In response to the current research on low emissivity surface infrared radiation mainly limited to its suppression of self radiation, and the lack of information on the impact of environmental radiation on its effective radiation, starting from establishing a general infrared feature model that includes self emitted reflected environmental radiation, the focus is on deriving the effects of solar radiation and ground radiation on low emissivity surfaces in two atmospheric infrared windows 3-5 μm-band and 8-14 μm. The influence model of effective infrared radiation in the 3-5 μm-band has been calculated and experimentally verified. The results indicate that solar radiation and ground radiation have an impact on low emissivity materials in the mid infrared region of 3-5 μm-band and far Infrared 8-14 μm. The impact of effective infrared radiation in the two bands is different and is related to factors such as ground temperature, the angle between the target surface and the ground, the atmospheric transmittance of solar radiation, and the angle of solar incidence. In general, reducing the emissivity of a surface can reduce its effective infrared radiation, which is beneficial for achieving infrared stealth. However, there are two common exceptions that make using low emissivity materials not a good way to achieve infrared stealth. One is that when the surface temperature of the target is below 60 ℃, due to the influence of solar radiation, reducing reflectivity in the 3-5 μm-band may actually enhance its effective radiation. That is a challenge to the targets in the background of low and normal temperatures during a clear day range to real
The existing hyperspectral underwater target detection algorithms are ineffective in adapting to nearshore environments, owing to the difficulty of extracting target signals from cluttered nearshore backgrounds combin...
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ISBN:
(数字)9798350385557
ISBN:
(纸本)9798350385564
The existing hyperspectral underwater target detection algorithms are ineffective in adapting to nearshore environments, owing to the difficulty of extracting target signals from cluttered nearshore backgrounds combined with weak target signals. To this end, hyperspectral unmixing (HU) is well suited in this paper for nearshore underwater target detection (UTD) task to address these issues, by extracting background endmembers and separating out weak target signals simultaneously. Specifically, we propose a novel nonlinear unmixing network for nearshore underwater target detection (NUN-UTD). It comprises an unsymmetrical autoencoder and a target prior preservation module to adapt to the complex nearshore environment. Experiments demonstrate that NUN-UTD achieves the best detection performances and visual results compared with other state-of-the-art methods.
This paper focuses on the imaging technology of multi-layer lobster vision system based on infrared band, aiming to develop a multi-layer lobster eye coordination optical system that can improve the energy concentrati...
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Compared with traditional landmine detection methods, the unmanned aerial vehicle borne measure is more suitable for rapidly detecting large-area minefields of scatterable landmines. We propose a multispectral fusion ...
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As a non-destructive testing technology, ground-penetrating radar (GPR) has been widely used in archaeological investigations of the earthen sites. Traditionally, a GPR antenna is ground-couple. It is attached to the ...
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