scholarly journals Miniaturized optical rotation detection system based on liquid crystal variable retarder in a K-Rb-21Ne gyroscope

2019 ◽  
Vol 27 (26) ◽  
pp. 38061 ◽  
Author(s):  
Li Xing ◽  
Yueyang Zhai ◽  
Wenfeng Fan ◽  
Jiong Huang ◽  
Tianxiao Song ◽  
...  
Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 410
Author(s):  
Eleonora Aruffo ◽  
Andrea Chiuri ◽  
Federico Angelini ◽  
Florinda Artuso ◽  
Dario Cataldi ◽  
...  

An innovative hyperspectral LIDAR instrument has been developed for applications in marine environment monitoring research activities, remotely detecting the fluorescence spectra produced in the spectral interval between 400 nm and 720 nm. The detection system is composed by a custom made photomultiplier charge integrating and measuring (CIM) unit, which makes automatic background signal subtraction, and a liquid crystal tunable filter (LCTF). The new instrument therefore has hyperspectral resolution and allows automatic background subtraction; it is compact and automated by custom software that permit to adapt the instrument properties depending on the environmental conditions. Laboratory tests to characterize the instrument performance have been carried out, concluding that this sensor can be employed in remote sites for Chl-a detection.


2007 ◽  
Vol 56 (2) ◽  
pp. 994
Author(s):  
Ren Guang-Jun ◽  
Yao Jian-Quan ◽  
Wang Peng ◽  
Zhang Qiang ◽  
Zhang Hui-Yun ◽  
...  

2007 ◽  
Vol 22 (37) ◽  
pp. 2815-2831 ◽  
Author(s):  
SHENG-JUI CHEN ◽  
HSIEN-HAO MEI ◽  
WEI-TOU NI

A number of experiments are underway to detect vacuum birefringence and dichroism — PVLAS, Q & A, and BMV. Recently, PVLAS experiment has observed optical rotation in vacuum by a magnetic field (vacuum dichroism). Theoretical interpretations of this result include a possible pseudoscalar–photon interaction and the existence of millicharged fermions. Here, we report the progress and first results of Q & A (QED [quantum electrodynamics] and Axion) experiment proposed and started in 1994. We use a 3.5-m high-finesse (around 30,000) Fabry–Perot prototype detector extendable to 7-m with the cavity mirrors suspended using X-pendulum-double pendulums. To polarize the vacuum, we use a 2.3-T dipole permanent magnet rotated at 5–10 rev/s, with 27-mm-diameter clear borehole and 0.6-m field length. Our ellipsometer/polarization-rotation-detection-system is formed by a pair of Glan–Taylor type polarizing prisms with extinction ratio lower than 10-8 together with a polarization modulating Faraday Cell with/without a quarter wave plate. Our first results give (-0.2 ± 2.8) × 10-13 rad/pass with 18,700 passes through a 2.3 T 0.6 m long magnet for vacuum dichroism measurement. We present our experimental limit on pseudo-scalar-photon interaction and millicharged fermions.


2015 ◽  
Vol 54 (12) ◽  
pp. 122601 ◽  
Author(s):  
Michinori Honma ◽  
Etsuo Uchida ◽  
Hiroo Saito ◽  
Takeshi Harada ◽  
Seiei Muto ◽  
...  

2018 ◽  
Vol 1 (1) ◽  
pp. 27-32
Author(s):  
Philip O Unabor ◽  
Michael S Okundamiya

This paper highlights the implementation of an embedded microcontroller-based intrusion detection system. The PIC16F84A microcontroller embedded in the system was programmed using the MikroC Language for the microcontrollers, to pick up an intrusion signal from the motion sensor, (which interprets the signal to be an electrical signal e.g. voltage), process it and then give a command to the display or output units. The output includes a 16x2 ALPHA liquid crystal display (LCD) and a buzzer (alarm unit), which in turn implement the command thereby notifying the environment of the presence of an intruder by displaying “Intruder Detected!” on the LCD and by a beeping sound with an interval of 0.5s delay by the alarm unit. The system was tested and was found to be efficient and suitable for solving myriad of security issues that confront us in modern times.


2020 ◽  
Vol 28 (24) ◽  
pp. 35748
Author(s):  
Jiong Huang ◽  
Zhuo Wang ◽  
Wenfeng Fan ◽  
Li Xing ◽  
Weijia Zhang ◽  
...  

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