Charge-Coupled Device Image Acquisition For Digital Phase Measurement Interferometry

1984 ◽  
Vol 23 (4) ◽  
Author(s):  
Keith N. Prettviohns
Keyword(s):  
Phase Measurement ◽  
Image Acquisition ◽  
Charge Coupled Device ◽  
Digital Phase

Comments on "An accurate digital phase measurement scheme"

1985 ◽  
Vol 73 (3) ◽  
pp. 490-491
Author(s):  
J.M. Carr ◽  
T.S. Rathore
Keyword(s):  
Phase Measurement ◽  
Measurement Scheme ◽  
Digital Phase

scholarly journals In Situ Image Acquisition and Measurement of Microdroplets Based on Delay Triggering

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 148
Author(s):  
Xuefeng Chang ◽  
Kang Zheng ◽  
Dan Xie ◽  
Xiayun Shu ◽  
Keyu Xu ◽  
...  
Keyword(s):  
Light Source ◽  
Delay Time ◽  
Imaging System ◽  
Image Acquisition ◽  
Ccd Camera ◽  
Time Interval ◽  
Charge Coupled Device ◽  
Drop On Demand ◽  
Relative Standard

An in situ image acquisition apparatus based on delay triggering for visualizing microdroplets formation is described. The imaging system includes a charge-coupled device camera, a motion control card, a driving circuit, a time delay triggering circuit, and a light source. By adjusting the varying trigger delay time which is synchronized with respect to the signal for jetting, the steady sequential images of the droplet flying in free space can be captured real-time by the system. Several image processing steps are taken to measure the diameters and coordinates of the droplets. Also, the jetting speeds can be calculated according to the delay time interval. For glycerin/water (60:40, mass ratio), under the given conditions of the self-made pneumatically diaphragm-driven drop-on-demand inkjet apparatus, the average of diameter and volume are measured as 266.8 μm and 9944 pL, respectively, and the maximum average velocity of the microdroplets is 0.689 m/s. Finally, the imaging system is applied to measure the volume of 200 microsolder balls generated from the inkjet apparatus. The average diameter is 87.96 μm, and the relative standard deviation is 0.83%. The results show good reproducibility. Unlike previous stroboscopic techniques, the present in situ imaging system which is absence of instantaneous high intensity light employs two control signals to stimulate the microdroplet generator and the charge-coupled device (CCD) camera. Hence, the system can avoid the desynchronization problem of signals which control the strobe light-emitting diode (LED) light source and the camera in previous equipment. This technology is a reliable and cost-effective approach for capturing and measuring microdroplets.

An accurate digital phase measurement scheme

1984 ◽  
Vol 72 (3) ◽  
pp. 397-398 ◽  
Author(s):  
T.S. Rathore ◽  
L.S. Mombasawala
Keyword(s):  
Phase Measurement ◽  
Measurement Scheme ◽  
Digital Phase

Fast Megapixel Charge-Coupled-Device Image Acquisition And Analysis System For High Energy Nuclear Physics

1987 ◽  
Vol 26 (10) ◽  
Author(s):  
M. L. Tincknell ◽  
S. I. Chase ◽  
T. Dinh ◽  
J. W. Harris ◽  
L. Teitelbaum
Keyword(s):  
Nuclear Physics ◽  
Image Acquisition ◽  
High Energy ◽  
Charge Coupled Device ◽  
Analysis System
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