Abstract A method for non-destructive testing and for quality checking solid materials in which an acoustic contact is formed during the measurement between a converter and the material, this contact being stabilized by imparting vibratory oscillations to the converter relative to the material being tested. Then the moment of the formation of a high-quality acoustic contact is determined by an abrupt decrease in the rate of the test signal amplitude change. The vibration is discontinued, and depending upon the accuracy of measurement required, the test signal parameters, which carry information on the properties of the article being tested are measured either directly upon interrupting the vibration, or after a time interval sufficient to reduce the internal stress of the converter created due to its deformation resulting from vibration and pressure against the article.
A method of ultrasonic measurements for the purpose of non-distructive testing of solid materials and articles, comprising the steps of placing an electromechanical converter in intimate acoustic contact with the article being tested under a constant pressure, imparting mutual vibratory oscillations to said electromechanical converter while; passing an ultrasonic test signal to said article through said converter; observing the rate of change of the amplitude of said test signal and discontinuing said mutual vibratory oscillations to said converter upon an abrupt decrease in the rate of change of said ultrasonic test signal amplitude, and subsequently measuring the parameters of said test signal which carry information on the properties of the article being tested.
Claim 2
Independent Claim
113 words
A method of ultrasonic measurements for the purpose of non-distructive testing of solid materials and articles, comprising the steps of placing an electromechanical converter in intimate acoustic contact with the article being tested under a constant pressure, imparting mutual vibratory oscillations to said electromechanical converter while; passing an ultrasonic test signal to said article through said converter; observing the rate of change of the amplitude of said test signal and discontinuing said mutual vibratory oscillations to said converter upon an abrupt decrease in the rate of change of said ultrasonic test signal amplitude, and subsequently measuring the parameters of said test signal which carry information on the properties of the article being tested.
Claim 3
Dependent Claim
40 words
A method as claimed in claim 1, wherein the test signal parameters are measured after interrupting the vibration of the converter over a time interval sufficient to remove the internal stress of the converter created due to vibration and pressure.