The suggested lightweight video encryption strategy offers a promising method for safeguarding multimedia data in cyberspace. The proposed strategy is based on a hybrid chaotic map and DNA encryption. Due to the fewer...
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In this work, a medical respiratory monitoring sensor based on the microbend effect of optical fiber on light transmission is proposed. The microbend effect of multimode optical fiber is analyzed theoretically using o...
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ISBN:
(纸本)9781510604698;9781510604704
In this work, a medical respiratory monitoring sensor based on the microbend effect of optical fiber on light transmission is proposed. The microbend effect of multimode optical fiber is analyzed theoretically using optical theory. A respiratory signal modulator with a "sandwich" microbender structure is designed enabling the noninvasive real-time monitoring. In vitro testing showed that the proposed sensor has excellent following characteristics and can automatically discern respiratory condition, the signal-to-noise ratio can be better than 28dB.
The WFE of the optical remote sensor system include the engineering from the fabrication processing, the position from deploying of segmented mirrors in orbit. In the process of feasibility demonstration, the total WF...
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ISBN:
(数字)9781510604704
ISBN:
(纸本)9781510604698;9781510604704
The WFE of the optical remote sensor system include the engineering from the fabrication processing, the position from deploying of segmented mirrors in orbit. In the process of feasibility demonstration, the total WFE error budget of large deployable optics plays a vital role in the general design of the remote sensor. According to results of calculation and iteration, in order to ensure the optical performance of the remote sensor in orbit, the WFE of the remote sensor is required to achieve lambda/8rms(@ lambda=632.8nm), and the WFE of the optical system is required to achieve lambda/10rms(@ lambda=632.8nm). In this paper, the error from optical system design, which based the mission realization of optical fabrication and optical alignment.
This paper puts forward a kind of optical fiber temperature sensor based on fluorescence lifetime, which can be applied to measurement in strong electromagnetic, strong corrosion and other harsh environment. A small v...
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ISBN:
(纸本)9781510604698;9781510604704
This paper puts forward a kind of optical fiber temperature sensor based on fluorescence lifetime, which can be applied to measurement in strong electromagnetic, strong corrosion and other harsh environment. A small volume, long service life, strong anti-jamming capability of fluorescence temperature sensor was designed by matching rare earth fluorescent material with longer fluorescent lifetime with tee optical coupler. The experimental results show that this method has a high measuring precision within the scope of 0-90 degrees C.
In this paper, a novel quarter wave plate which is composed of two segments of high birefringence fibers which are orthogonally welded is proposed and demonstrated. The orthogonally welded fibers are used to construct...
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ISBN:
(数字)9781510604704
ISBN:
(纸本)9781510604698;9781510604704
In this paper, a novel quarter wave plate which is composed of two segments of high birefringence fibers which are orthogonally welded is proposed and demonstrated. The orthogonally welded fibers are used to construct a high birefringence fiber loop mirror (Hi-Bi-FLM). Based on the transfer function of the Hi-Bi-FLP the length difference of the two segments can be calculated and by tuning one of them an equivalent quarter wave plate can be got. The tuning method is analyzed and discussed in detail.
We proposed a gain compensation method to overcome the amplitude fading induced by the gain-bandwidth product (GBP) of the detector, which will seriously deteriorate the positioning accuracy of the distributed disturb...
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ISBN:
(数字)9781510604704
ISBN:
(纸本)9781510604698;9781510604704
We proposed a gain compensation method to overcome the amplitude fading induced by the gain-bandwidth product (GBP) of the detector, which will seriously deteriorate the positioning accuracy of the distributed disturbance sensor at a long sensing range. To guarantee the performance of this method, we used the time-frequency distribution of the interference signal to distinguish the normal signal and the one need to compensate. A positioning measurement experiment using an asymmetric dual Mach-Zehnder interferometer (ADMZI) was carried out to verify the effectiveness of the proposed method. The experiment result showed that the sensing range can reach 121km, which was improved by over 40% compared to the traditional positioning method without gain compensation.
The growing number of Unmanned Aerial Vehicles (UAVs) in both military and civilian sectors necessitates advanced tracking and detection systems. This paper presents the development and field trial results of a high-r...
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The temperature dependence of a refractive index (RI) sensing probe based on a U-shape tapered plastic optical fiber (POF) was investigated experimentally. The changes in light propagation loss in the probe induced by...
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ISBN:
(数字)9781510604704
ISBN:
(纸本)9781510604698;9781510604704
The temperature dependence of a refractive index (RI) sensing probe based on a U-shape tapered plastic optical fiber (POF) was investigated experimentally. The changes in light propagation loss in the probe induced by temperature are of the same order of magnitude as those induced by measured RI changes. The temperature dependence loss and temperature dependence RI deviation of the sensing probe were measured (at the wavelength of 635 nm) in temperature of 10- 60 degrees C. By extracting pure temperature dependence of the sensing probe alone, the influence of temperature to the sensor was characterized.
作者:
Zhang LeiZheng YiboWang YuanYao JianquanHebei GEO Univ
Coll Gemol & Mat Technol Hebei Key Lab Optoelect Informat & Geodetect Tech Shijiazhuang 050031 Peoples R China Tianjin Univ
Inst Laser & Otpoelect Coll Precis Instruments & Optoelect Engn Tianjin 300072 Peoples R China
In this letter, surface plasmon resonance sensors based on grapefruit-type photonic crystal fiber with different silver nano-film structure have been analyzed and compared though the finite element method (FEM). Numer...
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ISBN:
(数字)9781510604704
ISBN:
(纸本)9781510604698;9781510604704
In this letter, surface plasmon resonance sensors based on grapefruit-type photonic crystal fiber with different silver nano-film structure have been analyzed and compared though the finite element method (FEM). Numerical results show that excellent sensor resolution of 7.143x10(-5)RIU can be achieved as the thickness of the filling silver film is 30nm by spectrum detection method.
Magnetooptic sensor based on electrogyration compensation is proposed and experimentally demonstrated by using single quartz crystal. The sensing unit is composed of single quartz crystal and two polarizers. Quartz cr...
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ISBN:
(数字)9781510604704
ISBN:
(纸本)9781510604698;9781510604704
Magnetooptic sensor based on electrogyration compensation is proposed and experimentally demonstrated by using single quartz crystal. The sensing unit is composed of single quartz crystal and two polarizers. Quartz crystal exhibits magneto-optic, electro-optic and electrogyration effects, thus magneto-optic Faraday rotation angle can be compensated by the electrogyration angle induced by the compensating voltage applied to the crystal. The compensating voltage is sensitive to both the deviation angle between light beam and principal crystalline axis, and the azimuth angle of polarizer. The 50Hz ac magnetic flux density within 267Gs has been measured, the compensating voltage is 0.72V/Gs for a single quartz crystal with a length of 23mm. The proposed sensor has potential application to closed-loop measurement of magnetic field.
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