Tunable and Wireless Photoimpedance Light Sensor

2014 ◽  
Vol 1666 ◽  
Author(s):  
Tanuj Saxena ◽  
Sergey Rumyantsev ◽  
Partha Dutta ◽  
Michael Shur
Keyword(s):  
Wireless Sensors ◽  
Dynamic Range ◽  
Frequency Dispersion ◽  
Semiconductor Layer ◽  
Device Performance ◽  
Wireless Sensing ◽  
Sensing Applications ◽  
Light Sensor ◽  
Materials Used

ABSTRACTWe report on the effects of the frequency dispersion in light sensitive materials used in photoimpedance wireless sensors. An example of such a sensor is a gated semiconductor connecting two or more fixed capacitances. The impedance of the device under illumination is changed by the change in the photoresistance of the semiconductor layer and the change in the gate-semiconductor capacitance. We report on the design and simulation of the frequency dispersion of the impedance of this device in silicon and discuss the physics and device performance. We also evaluate the dynamic range and sensitivity of the wireless photoimpedance sensors and show their advantages for wireless sensing applications compared to more conventional light sensors.

A Pulsed-Biasing Strain Gauge Measurement System for Wireless Sensing Applications

2012 ◽  
Author(s):  
Guan-Liang Lee ◽  
Jau-Horng Chen ◽  
Kuan-Ming Li
Keyword(s):  
Measurement System ◽  
Strain Gauge ◽  
Measurement Errors ◽  
Wireless Sensors ◽  
Operation Time ◽  
Wireless Sensing ◽  
Sensing Applications ◽  
Constant Bias ◽  
Measurement Results ◽  
Gauge Measurement

This paper presents a pulsed-biasing strain gauge measurement system for wireless sensing applications. The use of pulsed-biasing on the strain gauge can reduce the power consumption of the sensor, which is crucial for low-power wireless sensors. Moreover, without using a constant bias current, power dissipated on the resistive bridge that includes the strain gauge can be reduced. Such reduction can also reduce measurement errors from an increased strain gauge temperature. A strain gauge wireless sensor was constructed using commercially available components. Measurement results show that the pulsed-biasing technique can be implemented with a duty cycle down to around 40% with negligible measurement error at a data rate of 32 Hz. The power saved is equivalent to an increased operation time of 50%.

Ambient Energy Harvesting for Wireless Sensor Nodes: A Review

2014 ◽  
Vol 1025-1026 ◽  
pp. 1093-1098
Author(s):  
Mohamed Hanafiah bin Omar ◽  
Meng Hee Lim
Keyword(s):  
Energy Harvesting ◽  
Wireless Sensors ◽  
Business Processes ◽  
Sensor Nodes ◽  
Wireless Sensor ◽  
Wireless Sensing ◽  
Power Devices ◽  
Wireless Sensor Nodes ◽  
Industrial Systems ◽  
Sensing Applications

Energy harvesting has generated a lot of interest in low power devices and wireless sensing applications as a viable replacement to the batteries that are required to power them. Wireless sensors nodes on the other hand have gain considerable interests from researchers and industries alike. Wireless sensing have the potential to improve productivity of industrial systems by providing greater awareness, control and integration of business processes. This paper attempts to provide an overview of the available technologies and at the same time deduce a practical energy harvesting platform as applied to wireless sensor nodes based on current research.

Analysis and comparison of semiconductor materials processed at IR vs. UV laser wavelengths for DRAM yield enhancement applications

2005 ◽  
Vol 890 ◽  
Author(s):  
Andy E. Hooper ◽  
Allen Kawasaki ◽  
Paul Kirby ◽  
Robert Hainsey ◽  
Jeongho Bang ◽  
...  
Keyword(s):  
Laser Energy ◽  
Yield Enhancement ◽  
Laser Spot ◽  
Semiconductor Layer ◽  
Semiconductor Materials ◽  
Uv Laser ◽  
Spot Diameter ◽  
Materials Used ◽  
Laser Spot Diameter

ABSTRACTThis report demonstrates the effects of IR and UV laser energy on common semiconductor layer stack materials used for DRAM laser fuses. By moving from IR to UV wavelengths it is possible to significantly shrink the laser spot diameter from ∼1.6 μm to 0.8 μm. Effects and concerns for the absorption of UV energy by Si, SiO2, nitrides, and oxynitrides are also presented.

Parallel capacitive temperature micro‐sensor for passive wireless sensing applications

2016 ◽  
Vol 52 (15) ◽  
pp. 1345-1347 ◽  
Author(s):  
Qing‐Ying Ren ◽  
Li‐Feng Wang ◽  
Qing‐An Huang
Keyword(s):  
Wireless Sensing ◽  
Sensing Applications ◽  
Micro Sensor
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