Precise force measurement method by a Y-shaped cavity dual-frequency laser

2011 ◽  
Vol 9 (10) ◽  
pp. 101201-101204 ◽  
Author(s):  
张斌 Guangzong Xiao ◽  
肖光宗 Xingwu Long ◽  
龙兴武 Bin Zhang ◽  
李耿 Geng Li
Keyword(s):  
Measurement Method ◽  
Force Measurement ◽  
Dual Frequency ◽  
Frequency Laser

Ultrasonic measurement of clamping force for injection molding machine

2019 ◽  
Vol 39 (4) ◽  
pp. 388-396 ◽  
Author(s):  
Peng Zhao ◽  
Yao Zhao ◽  
Jianfeng Zhang ◽  
Junye Huang ◽  
Neng Xia ◽  
...  
Keyword(s):  
Injection Molding ◽  
Measurement Method ◽  
Large Scale ◽  
Force Measurement ◽  
Low Cost ◽  
Ultrasonic Method ◽  
Injection Molding Process ◽  
Propagation Time ◽  
Clamping Force ◽  
Molding Process

AbstractAn online and feasible clamping force measurement method is important in the injection molding process and equipment. Based on the sono-elasticity theory, anin situclamping force measurement method using ultrasonic technology is proposed in this paper. A mathematical model is established to describe the relationship between the ultrasonic propagation time, mold thickness, and clamping force. A series of experiments are performed to verify the proposed method. Experimental findings show that the measurement results of the proposed method agree well with those of the magnetic enclosed-type clamping force tester method, with difference squares less than 2 (MPa)2and errors bars less than 0.7 MPa. The ultrasonic method can be applied in molds of different thickness, injection molding machines of different clamping scales, and large-scale injection cycles. The proposed method offers advantages of being highly accurate, highly stable, simple, feasible, non-destructive, and low-cost, providing significant application prospects in the injection molding industry.

Feasibility Study for Vision-Based Cable Force Measurement Using Smartphone

2016 ◽  
Author(s):  
Xuefeng Zhao ◽  
Kwang Ri ◽  
Yan Yu ◽  
Chunil Kang ◽  
Mingchu Li ◽  
...  
Keyword(s):  
Measurement Method ◽  
Force Measurement ◽  
Smartphone Application ◽  
Cable Model ◽  
Construction Period ◽  
Service Period ◽  
Cable Force ◽  
Vibration Responses ◽  
Cable Force Measurement ◽  
Circular Target

An accurate cable force measurement is one of very important practical problems during construction period as well as during service period of cable stayed bridge. In the recent years, with the advances in smartphone technologies, it is possible to rapidly evaluate structural health status and postevent damage using ubiquitous smartphones. In this paper, a novel vision-based cable force measurement method using smartphone camera is proposed for the first time, which enable to estimate cable force by recognizing cable vibration using smartphone camera, and then cable model test is carried out to verify the feasibility of the proposed method. The comparison test between the smartphone application Orion-CC measuring cable force from smartphone built-in accelerometer and the proposed method is conducted on a laboratory scale cable model with different sampling rates. In the proposed method, the vibration responses of cable are obtained by monitoring displacements of a preprinted black circular target attached on the cable model using smartphone camera. The test results showed satisfactory agreements between two methods in both frequency domain and cable force value, demonstrating the feasibility of the proposed cable force measurement method and its advantages such as convenience, ease of operation, and speediness.

Amplification of Dual-Frequency Laser for Photonic Millimeter-Wave Signal Generation

2014 ◽  
Vol 34 (11) ◽  
pp. 1114003
Author(s):  
胡淼 Hu Miao ◽  
张飞 Zhang Fei ◽  
张翔 Zhang Xiang ◽  
郑尧元 Zheng Yaoyuan ◽  
孙骁 Sun Xiao ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Signal Generation ◽  
Dual Frequency ◽  
Wave Signal ◽  
Frequency Laser

Effect of Time-Frequency Disturbance on Performance of Dual-Frequency Laser Coherent Detection System

2016 ◽  
Vol 53 (6) ◽  
pp. 061403 ◽  
Author(s):  
张建华 Zhang Jianhua ◽  
杨德钊 Yang Dezhao ◽  
高洁 Gao Jie ◽  
刘锡民 Liu Ximin
Keyword(s):  
Detection System ◽  
Coherent Detection ◽  
Dual Frequency ◽  
Time Frequency ◽  
Frequency Laser

Experimental Study of the Dual-Frequency Laser Based on the Nd∶YVO4/Nd∶GdVO4 Combined Crystal

2018 ◽  
Vol 55 (9) ◽  
pp. 091407
Author(s):  
金涛 Jin Tao ◽  
胡淼 Hu Miao ◽  
李鹏 Li Peng ◽  
范红丹 Fan Hongdan ◽  
韩宁 Han Ning ◽  
...  
Keyword(s):  
Experimental Study ◽  
Dual Frequency ◽  
Frequency Laser

scholarly journals A Parallel-Phase Demodulation-Based Distance-Measurement Method Using Dual-Frequency Modulation

2019 ◽  
Vol 10 (1) ◽  
pp. 293
Author(s):  
In-Gyu Jang ◽  
Sung-Hyun Lee ◽  
Yong-Hwa Park
Keyword(s):  
Frequency Modulation ◽  
Measurement Method ◽  
Continuous Wave ◽  
Measurement Range ◽  
Distance Measurement ◽  
Measurement Technology ◽  
Dual Frequency ◽  
Distance Measurements ◽  
Time Required ◽  
Phase Demodulation

Time-of-flight (ToF) measurement technology based on the amplitude-modulated continuous-wave (AMCW) model has emerged as a state-of-the-art distance-measurement method for various engineering applications. However, many of the ToF cameras employing the AMCW process phase demodulation sequentially, which requires time latency for a single distance measurement. This can result in significant distance errors, especially in non-static environments (e.g., robots and vehicles) such as those containing objects moving relatively to the sensors. To reduce the measurement time required for a distance measurement, this paper proposes a novel, parallel-phase demodulation method. The proposed method processes phase demodulation of signal in parallel rather than sequentially. Based on the parallel phase demodulation, 2π ambiguity problem is also solved in this work by adopting dual frequency modulation to increase the maximum range while maintaining the accuracy. The performance of proposed method was verified through distance measurements under various conditions. The improved distance measurement accuracy was demonstrated throughout an extended measurement range (1–10 m).

Brillouin distributed fiber sensor based on a Dual-frequency laser

2019 ◽  
Author(s):  
M. Salhi ◽  
V. Kemlin ◽  
S. Faci ◽  
G. Baili ◽  
A. Khadour ◽  
...  
Keyword(s):  
Fiber Sensor ◽  
Dual Frequency ◽  
Frequency Laser
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