Reviewing almost two decades of digital correlator development

1997 ◽  
Vol 104 (1) ◽  
pp. 6-7
Author(s):  
W. Peters ◽  
R. Peters
Keyword(s):  
Digital Correlator

Auto and Cross Correlation Measurements in a Turbine Cascade Using a Digital Correlator

1982 ◽  
Author(s):  
P. J. Bryanston-Cross ◽  
J. J. Camus
Keyword(s):  
Mach Number ◽  
High Speed ◽  
Cross Correlation ◽  
Turbine Blades ◽  
Image Plane ◽  
Strongly Correlated ◽  
Trailing Edge ◽  
Number Range ◽  
Cross Correlations ◽  
Digital Correlator

A simple technique has been developed which samples the dynamic image plane information of a schlieren system using a digital correlator. Measurements have been made in the passages and in the wakes of transonic turbine blades in a linear cascade. The wind tunnel runs continuously and has independently variable Reynolds and Mach number. As expected, strongly correlated vortices were found in the wake and trailing edge region at 50 KHz. Although these are strongly coherent we show that there is only limited cross-correlation from wake to wake over a Mach no. range M = 0.5 to 1.25 and variation of Reynolds number from 3 × 105 to 106. The trailing edge fluctuation cross correlations were extended both upstream and downstream and preliminary measurements indicate that this technique can be used to obtain information on wake velocity. The vortex frequency has also been measured over the same Mach number range for two different cascades. The results have been compared with high speed schlieren photographs.

A New Type of One-Bit Digital Correlator

1980 ◽  
Vol 4 (1) ◽  
pp. 21-23
Author(s):  
T. W. Cole
Keyword(s):  
Ordered Set ◽  
New Type ◽  
The Mean ◽  
Digital Correlator

Given an ordered set of samples {ai} of some function, then the autocorrelation of that function is the mean lagged product of these samples.

Burst Digital Correlator for LDV Signal Processing

1989 ◽  
pp. 415-433 ◽  
Author(s):  
Tsuyoshi Nakajima ◽  
Yuji Ikeda ◽  
Noboru Kurihara ◽  
Ryuichi Matsumoto
Keyword(s):  
Signal Processing ◽  
Digital Correlator

Inexpensive digital correlator for spectrophotometric and other analytical measurements

1974 ◽  
Vol 46 (14) ◽  
pp. 2141-2150 ◽  
Author(s):  
T. A. Woodruff ◽  
H. V. Malmstadt
Keyword(s):  
Analytical Measurements ◽  
Digital Correlator
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