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Gao H.,Precision Information | Liu P.,Precision Information | Liu J.,Precision Information | Zheng Z.,Precision Information | And 5 more authors.
Journal of the Optical Society of America B: Optical Physics | Year: 2017

We investigate permanent hologram recording in a photosensitive material with high diffraction efficiency (DE) of ∼90%. We successfully recorded three-dimensional (3D) object information, gratings, and "hogel" images in this photopolymer film without postprocessing. In addition, we study multiplexed hologram storage in this material. Because of its high resolution, high DE, and lack of need for electric field and postprocessing, this photopolymer may be suitable for analog hologram, digital hologram, and big data permanent storage. Our study proposes a potential holographic recording material to apply in large size static 3D holographic displays, including analog hologram storage, digital hologram prints, holographic anticounterfeiting, and big data holographic disks. © 2017 Optical Society of America.

Jin W.,Precision Information | Yan G.,Precision Information | Wu H.,Precision Information | Lu S.,Precision Information | Zhou Z.,Precision Information
Artificial Organs | Year: 2017

Artificial anal sphincter (AAS) is an in situ implanted device that acts as a treatment for fecal incontinence regardless of etiology by augmenting the incompetent sphincteric structures. However, AAS is impeded from becoming a valid therapy by its high rate of ischemic complication and malfunction. This article presents an original puborectalis-like artificial anal sphincter (PAAS) that features a low risk of ischemia necrosis and rectal perception remodeling. The device retains continence by reproducing the action, including the pulling and angulating the rectum, of the puborectalis muscle, which forms the anorectal angle and reduces the required clamping pressure. Three rectal pressure sensors were embedded to maintain the pressure exerted on the rectal wall in a safe range and to monitor the distention of the rectum. A series of in vitro studies were conducted with a porcine rectum, and this PAAS prototype manifested the ability of maintaining continence with a clamping pressure considerably lower than that required by other AAS devices. The pressure sensors exhibit good linearity, and the function of rectal perception remodeling has also revealed high reliability with a success rate of 93.3%. © 2017 International Center for Artificial Organs and Transplantation and Wiley Periodicals, Inc.

Zhang X.,Precision Information | He H.,Precision Information | Fan J.,Precision Information | Gu C.,Precision Information | And 5 more authors.
Optics Express | Year: 2013

Nonlinearity of semiconductor nanowires makes them potential frequency converters in nanoscale optoelectronics. Here we demonstrate that sum frequency generation signals can be acquired from GaAs nanowires when excited by a femtosecond laser at 1048 nm and a tunable optical parametric oscillator ranging from 1416 nm to 1770 nm. The SFG intensity is insensitive to the polarization but quite sensitive to the temporal overlap of incident lasers pulses. It is shown that they can work for pulsewidth measurement of femtosecond lasers in the near infrared band. Our results suggest GaAs NWs to be excellent optical nonlinear mixers in nanoscale optoelectronics. © 2013 Optical Society of America.

Lamb D.W.,Precision Information | Schneider D.A.,Precision Information | Trotter M.G.,Precision Information | Schaefer M.T.,Precision Information | Yule I.J.,Massey University
Computers and Electronics in Agriculture | Year: 2011

Recently reported testing of active, optical crop sensors in low-level aircraft have demonstrated a new class of airborne sensing system that can be deployed under any ambient illumination conditions, including at night. A second-generation, high-powered, light-emitting diode system has been assembled and tested over a 80ha field of wheat (Triticum aestevum) by mapping the normalised difference vegetation index (NDVI) at altitudes ranging from 15 to 45 m above the canopy; significantly higher altitudes than existing systems. Comparisons with a detailed on-ground NDVI survey indicated the aerial sensor values were highly correlated to the on-ground sensor (0.79

Lei L.,Engineering School of Information Technology and Communication | Guang-Jun R.,Engineering School of Information Technology and Communication | Bei L.,Engineering School of Information Technology and Communication | Jian-Quan Y.,Precision Information
Journal of Optoelectronics and Advanced Materials | Year: 2011

Using the temperature sensitivity of refractive index of Liquid Crystal (LC), a new type of LC photonic crystal fiber (PCF) terahertz waveguide by temperature modulation is designed which is based on that the core of PCF is filled with nematic LC 5CB. The change of characteristics of modes of PCF with temperature under the conditions of different core radius is simulated. It is shown that there is no endless single mode. The waveguide dispersion of terahertz waveguide under the different temperature is simulated. It is shown that, the dispersion constant decreases with temperature increasing and the ultra-flattened dispersion is implemented.

Hao C.J.,Precision Information | Lu Y.,Precision Information | Wang M.T.,Precision Information | Wu B.Q.,Precision Information | And 2 more authors.
IEEE Photonics Journal | Year: 2013

We propose a surface plasmon resonance (SPR) refractive index (RI) sensor based on an active Yb3+-doped photonic crystal fiber (PCF) in this paper. With the proposed sensor, using the pump light at 976 nm can produce laser at 1060 nm. In addition, the sensitivity can be influenced obviously by a bit change of the refraction index of analyte in the air holes to achieve the intra-cavity fiber sensing. It is found that not only the different air-filling ratios but also the different analyte RIs of na > 1:45 or n a < have different effects on the output power and confinement loss, and lead to different trends. The intra-cavity PCF sensing system has great practical value and significance for their advantages of compact structure and high sensitivity. © 2009-2012 IEEE.

Lamb D.W.,Precision Information | Schneider D.A.,Precision Information | Stanley J.N.,Precision Information
Precision Agriculture | Year: 2014

An integrated active optical, and passive thermal infrared sensing system was deployed on a low-level aircraft (50 m AGL) to record and map the simple ratio (SR) index and canopy temperature of a 230 ha cotton field. The SR map was found to closely resemble that created by a RapidEye satellite image, and the canopy temperature map yielded values consistent with on-ground measurements. The fact that both the SR and temperature measurements were spatially coincident facilitated the rapid and convenient generation of a direct correlation plot between the two parameters. The scatterplot exhibited the typical reflectance index-temperature profile generated by previous workers using complex analytical techniques and satellite imagery. This sensor offers a convenient and viable alternative to other forms of optical and thermal remote sensing for those interested in plant and soil moisture investigations using the ‘reflectance index-temperature’ space concept. © Springer Science+Business Media New York 2014.

Kohl J.,Friedrich - Alexander - University, Erlangen - Nuremberg | Fey D.,Friedrich - Alexander - University, Erlangen - Nuremberg | Basig J.,Precision Information
2015 International Conference on Industrial Instrumentation and Control, ICIC 2015 | Year: 2015

The advancing automation of the industrial production requires faster and more efficient programmable logic controllers. Today's controller architectures based on specialized processors to execute the STL application are at their limits. For any further improvement the architecture of these processors needs to evolve from single core in order execution to a multicore out of order architecture. This step can not occur without additions to the PLC's instruction set. Therefore a PLC processor instruction set simulation is required that allows a quick evaluation of the effectiveness and efficiency of instruction set changes as well as changes to the processor's architecture. Current architecture description languages (ADL) allow the fast modeling of these changes with enough flexibility for the planned improvements and provide fast simulation speed. This work presents for the first time an instruction set simulation environment for STL compatible PLC processors using the ADL ArchC as a base for further research. © 2015 IEEE.

Sharan G.,Precision Information
c2013 IEEE Global Humanitarian Technology Conference: South Asia Satellite, GHTC-SAS 2013 | Year: 2013

This paper describes the development of technology to harvest (condense and collect) dew water for use of people living in coastal area of Gujarat province, north-west India. Potable water is severely scarce in the area, such that extra supply of even tens of liters a day could add to water security of the households. A R&D program was initiated in the year 2001-02, after it was noticed that dew occurred more frequently and in larger quantity here than inlands. Dew water is extracted from air using condensers made of special plastic film which cool rapidly at night by radiating heat to atmosphere. Dew condensing efficiency of the plastic film appears to be comparable to blades of grass, natural vegetation. A four year R&D program led to design of large working systems after testing of prototypes and pilot units. Large dew harvest systems have been erected on roofs (condenser-on-roof), open ground (condenser-on-ground). Technology is simple, uses material available in the area and is amenable to do-it-yourself procedure. © 2013 IEEE.

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