Study on the Application of High Precision Strain Acquisition System Based on Twin-Constant-Current Source

2013 ◽  
Vol 437 ◽  
pp. 399-403
Author(s):  
Zong Ju Hu ◽  
Zeng Yong Long

Aiming at the shortcomings of the constant voltage source strain acquisition system, the paper put forward a new strain acquisition technology based on the double-side half-bridge measurement of the constant current source. It has demonstrated and analyzed the advantages of constant current source circuit using for strain collection, and has raised the design of multi-channel strain acquisition system. Lab test and running in a large fan blade deformation tests showed that the strain acquisition system had high measurement precision, stability, anti-interference and reliability.

2014 ◽  
Vol 484-485 ◽  
pp. 1126-1129
Author(s):  
Wei Wang

the system to DC voltage source as the core, AT89C52 MCU as the main controller, the output voltage to set the DC power supply through the keyboard, with a step function voltage to reality, the actual output value. This design is divided into four modules: SCM control and display module, digital to analog (D/A) conversion module, a constant voltage source module, output module. MCU control module as the core, the input signal is converted to digital quantity output; constant current source module voltage D/A conversion to analog conversion into constant pressure through a constant voltage circuit. The system has good reliability, high precision.


2014 ◽  
Vol 607 ◽  
pp. 673-676 ◽  
Author(s):  
Chen Ding ◽  
Ya Wen Dai ◽  
Peng Li ◽  
Yang Sun ◽  
Wei Zheng Wang ◽  
...  

Dynamic strain acquisition technology is becoming increasingly important in industrial production. Compared with the static strain acquisition technology,the dynamic stain acquisition technology provided a much wider range of frequencies from 0~100KHz which required a much more accurate data acquisition system. This paper proposed an accurate data acquisition system which included electric bridge、constant current source、signal amplifier and anti-aliasing filter. This system has largely suppressed noise and increased the performance of the dynamic strain acquisition.


Author(s):  
R. Aaron Falk

Abstract LIVA (L ight I nduced V oltage A lterations) and TIVA (T hermally I nduced V oltage A lterations) have demonstrated significant capability for fault isolation. A difficulty with both techniques is their use of a constant current source, whereas integrated circuits operate with a constant voltage source. A new technique that utilizes the constant current sensing of LIVA/TIVA, while allowing for use of constant voltage bias on the integrated circuit, has been developed. As a bonus, the technique is also significantly more sensitive (at least one order of magnitude) than the standard LIVA/TIVA approach.


2013 ◽  
Vol 380-384 ◽  
pp. 3204-3208
Author(s):  
Fei Yu ◽  
Zhao Jie

Low power lighting LED has the advantages of low cost and good heat dissipation. But the current driver for this kind of LED does not have a good efficiency. In this paper a new kind of LED driver circuit was designed. By using current mirror and PWM technique, the circuit has good efficiency. By simulation with PSPICE, we can prove that the circuit has can divide current equally and has a good performance while the voltage source has some jitters.


2012 ◽  
Vol 588-589 ◽  
pp. 936-939
Author(s):  
Hong Li Cheng ◽  
Xiao Dan Ren ◽  
Shuai Sun

This paper introduces a kind of numerical controlled LED drive power supply based on ARM7. User can set the number and brightness of the LEDs to be lit by the remote control. Switching voltage source and the linear constant current source are connected in series, this circuit structure can ensure high efficiency and small current ripple. ARM7 completes the data collection, fuzzy PID algorithm processing, and real-time output adjustment. This paper explains the working principle of the system in detail and then simulates it in the simulink. The results show that it can satisfy the users' diverse requirements well and give full play to the convenience and controllability of the digital controller.


2011 ◽  
Vol 82 (1) ◽  
pp. 013906 ◽  
Author(s):  
D. Talukdar ◽  
R. K. Chakraborty ◽  
Suvendu Bose ◽  
K. K. Bardhan

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