Study on closed loop frequency tracking circuit of resonant infrared sensor

2021 ◽  
Author(s):  
Yao Yao ◽  
Xia Zhang
Keyword(s):  
Closed Loop ◽  
Infrared Sensor ◽  
Frequency Tracking

scholarly journals Fast and stable photoacoustic gas spectroscopy by frequency tracking of a quartz tuning fork in closed loop detection

2020 ◽  
Author(s):  
Maxime Duquesnoy ◽  
Raphaël Lévy ◽  
Jean-Michel Melkonian ◽  
Guillaume Aoust ◽  
Myriam Raybaut ◽  
...  
Keyword(s):  
Closed Loop ◽  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
Frequency Tracking ◽  
Loop Detection

A closed-loop system for frequency tracking of piezoresistive cantilever sensors

2013 ◽  
Author(s):  
Hutomo Suryo Wasisto ◽  
Qing Zhang ◽  
Stephan Merzsch ◽  
Andreas Waag ◽  
Erwin Peiner
Keyword(s):  
Closed Loop ◽  
Loop System ◽  
Closed Loop System ◽  
Frequency Tracking ◽  
Cantilever Sensors

Research of Automatic Tracing Control for Infrared Intelligent Lunar Vehicle

2012 ◽  
Vol 588-589 ◽  
pp. 1519-1522
Author(s):  
Xin Qian ◽  
Hua Dong Zang
Keyword(s):  
Control Algorithm ◽  
Sensor Array ◽  
Closed Loop ◽  
Sensor Data ◽  
Control Parameters ◽  
Infrared Sensor ◽  
Real Time Processing ◽  
Loop Control ◽  
Time Processing ◽  
Nonlinear Analog

In intelligent lunar vehicle’s infrared tracing automatic control, reflective infrared sensor array is adopted for detecting the path. By processing the sensor data and relative error through the detection of nonlinear analog A/D sampling, real-time processing and non-linearizing the control parameters in the PID variable scale incremental control algorithm, closed-loop control would be realized. In addition, incremental PD formula can be derived by fuzzy control technology, while the sensitivity and stability of the vehicle tracing can be improved by adjusting parameters in programming. It proved that this method can effectively shorten response time, reduce random interference, optimize the tracing line, eliminate oscillation and improve the mobility.

scholarly journals Closed-Loop Frequency Tracking and Rejection

1997 ◽  
Vol 30 (6) ◽  
pp. 1263-1268
Author(s):  
Allan J Connolly ◽  
Barbara F La Scala ◽  
Peter J Kootsookos
Keyword(s):  
Closed Loop ◽  
Frequency Tracking

Development of Handheld Ultrasonic Spot Welding Machines

2012 ◽  
Vol 588-589 ◽  
pp. 1723-1728
Author(s):  
Wu Zhu ◽  
Chao Jiang ◽  
Jia Min Zhu ◽  
Yong Wang ◽  
Jia Min Zhang
Keyword(s):  
Spot Welding ◽  
High Speed ◽  
Closed Loop ◽  
Detection Accuracy ◽  
Ultrasonic Power ◽  
Vibration System ◽  
Frequency Tracking ◽  
Loop Control ◽  
Series Resonance ◽  
High Detection

As the resonance frequency of the ultrasonic vibration system drifts according to the different operating condition, Ultrasonic power supply based on MSP430 is designed in this thesis. Series inductance and parallel capacitance are used to match the vibration system and series resonance technology used in primary side of inverter transformer can reduce switch loss. ADC module in MSP430 is used to get frequency shift, and PWM module is made to adjust the operating frequency of TL494, which can realize closed loop control of frequency tracking. The results of experiments show that the method designed in this thesis has high detection accuracy, high speed dynamic response and high stability of frequency tracking.

Intestinal Bacteriology of Closed Loop, Strangulated Obstruction in Dogs.

1961 ◽  
Vol 41 (3) ◽  
pp. 245-250 ◽  
Author(s):  
George H. Bornside ◽  
Isidore Cohn
Keyword(s):  
Closed Loop
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