scholarly journals Low-Power chip-scale Rubidium plasma light source for miniature atomic clocks

2011 ◽  
Author(s):  
Vinu Venkatraman ◽  
Herbert Shea ◽  
Yves Petremand ◽  
Nico de Rooij ◽  
Christoph Affolderbach ◽  
...  
Keyword(s):  
Low Power ◽  
Light Source ◽  
Atomic Clocks

Three Transducers Embedded into a Single SiC Photodetector: LSP Direct Image Sensor, Optical Amplifier and Demux

2012 ◽  
Vol 18-19 ◽  
pp. 265-270
Author(s):  
M. Vieira ◽  
P. Louro ◽  
M.A. Vieira ◽  
J. Costa ◽  
M. Fernandes
Keyword(s):  
Low Power ◽  
Light Source ◽  
Optical Amplifier ◽  
Color Pattern ◽  
Image Sensor ◽  
Direct Image ◽  
Sensor Output ◽  
Color Sensor ◽  
Output Characteristics ◽  
Color Channels

A double pi’n/pin a-SiC:H heterostructure with two optical connections for light triggering in different spectral regions is presented and its behavior as image and color sensor, optical amplifier and demux device is discussed. The design and the light source properties are correlated with the sensor output characteristics. Different readout techniques are used. When a low power monochromatic scanner readout is used the transducer recognizes a color pattern projected on it acting as a color and image sensor. Scan speeds up to 104lines per second are achieved without degradation in the resolution. If the photocurrent generated by different monochromatic pulsed channels is readout directly, the information is demultiplexed. Results show that it is possible to decode the information from three simultaneous color channels at bit rates per channel higher than 4000 bps. Finally, when triggered by an appropriated wavelength, it can amplify or suppress the generated photocurrent working as an optical amplifier. Electrical models are present to support the sensing methodologies.

scholarly journals NIR Irradiation Based on Low-Power LED Drive Module Design for Fat Reduction

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Ki-Cheol Yoon ◽  
Kwang Gi Kim
Keyword(s):  
Low Power ◽  
Water Content ◽  
Light Source ◽  
Light Emitting Diode ◽  
Salt Content ◽  
High Water ◽  
High Water Content ◽  
Module Design ◽  
Fat Reduction ◽  
Reduction Effect

In this study, we designed a low-power visible ray (V) drive module based on a light-emitting diode (LED) to initiate fat reduction using light source irradiation. A chemical phantom of muscle and fat was fabricated, and the performance of the proposed LED drive module was tested using this chemical phantom. The LED light source could reduce fat by irradiating the skin 4–5 cm deep. The device exhibits a negative feedback and parallel amplification to maintain a stable circuit based on low-power consumption. Muscles have a high-water content and low impedance, whereas fats have a low water content and significant salt content. Therefore, fat exhibits high impedance. Chemical phantoms were fabricated according to these impedance values, and the fat reduction effect using the LED circuits was analyzed. When the fat phantom was irradiated by the light source, the fat impedance lowered, and we confirmed that fat reduction could be obtained. This study is expected to be applicable to family medicine and weight management health care.

A low-power 4.6 GHz VCO for Chip-Scale Atomic Clocks

2010 ◽  
Author(s):  
J. S. Humble ◽  
R. A. Philpott ◽  
B. K. Gilbert ◽  
E. S. Daniel ◽  
R. Lutwak
Keyword(s):  
Low Power ◽  
Atomic Clocks

scholarly journals Development of low power consumption LED light source for visible light spectrophotometry

2011 ◽  
Vol 12 ◽  
pp. 53-60
Author(s):  
Yoshiyuki Nakano ◽  
Yuzo Hosoe ◽  
Tetsuichi Fujiki ◽  
Yasushi Yoshikawa ◽  
Shuichi Watanabe
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Visible Light ◽  
Light Source ◽  
Low Power Consumption ◽  
Led Light

scholarly journals Influence of light source on the sensitivity of a Polarization Maintaining Fiber Loop Mirror vibration sensor

2019 ◽  
Vol 39 (2) ◽  
pp. 327-334
Author(s):  
Ying Jiang ◽  
Mingjin Yu ◽  
Mengqi Zhang ◽  
Jiyun Lu
Keyword(s):  
Low Power ◽  
Light Source ◽  
High Power ◽  
Narrow Band ◽  
Vibration Monitoring ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Fiber Loop Mirror ◽  
Loop Mirror ◽  
Fiber Loop

Wavelength or light intensity demodulation method for a polarization maintaining fiber loop mirror (PM-FLM) sensor is not only expensive but also unsuitable for vibration monitoring. This paper studies the voltage demodulation principle and explores theoretically the influence of light source on the sensitivity. Then a PM-FLM sensor is applied to vibration monitoring. A low-power narrow-band light source reflected from FBG and a high-power laser light source are used respectively as input. The time domain voltage signals of vibration from a photo-detector are collected by a data acquisition card and converted via a fast Fourier transform algorithm. The experimental result shows that a PM-FLM sensor using a high-power narrow-band light source as input has a higher sensitivity to vibration than the one using a low-power narrow-band light source. In practical application, we can choose a high-power narrow-band light source as input to improve the sensitivity to vibration.

Reducing frequency drift caused by light shift in coherent population trapping-based low-power atomic clocks

2020 ◽  
Vol 116 (10) ◽  
pp. 104102 ◽  
Author(s):  
Shinya Yanagimachi ◽  
Kazuhiro Harasaka ◽  
Ryoichiro Suzuki ◽  
Mitsuru Suzuki ◽  
Shigeyoshi Goka
Keyword(s):  
Low Power ◽  
Coherent Population Trapping ◽  
Frequency Drift ◽  
Atomic Clocks ◽  
Light Shift ◽  
Population Trapping
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