A DEVICE FOR MEASUREMENT OF ULTRASONIC VELOCITY AND ATTENUATION IN SOLIDS UNDER DIFFERENT THERMAL CONDITIONS

摘要

A device for the measurement of ultrasonic velocity and attenuation in solid materials under different thermal conditions, which comprises two cylindrical wave guides(4,5) having plane and parallel ends characterized in that the said wave guides being movably fixed coaxially by means such as spring loaded end holders(12) attached to a stand(13) so as to allow placement of a test specimen (1) in between the proximal wave guide ends and fixing of an ultrasonic generating(2) and receiving(3) transducers(2,3) at the distal wave guide ends, the said transducers(2,3) being connected to an ultrasonic pulsar/receiver in turn connected to a digital storage oscilloscope (DSO,shown in fig 6), the said distal wave guide portions being also provided with cooling jackets(7), the said coaxially movably fixed wave guides(4,5) and specimen(l) being enclosed in a tubular heating chamber(6) consisting of a perforated insulating pipe(14) closed at both ends with insulating sheets(15) having co-centric holes for the wave guides(4,5), the said insulating pipe being provided with spirally wound external electrical heating element(lO) connected to a known temperature controller, the said temperature controller having temperature sensors(8,9) placed in proximity of the said specimen(l) and heating element(lO), the said heating element(lO) being enclosed with insulating material(ll) and casing(16), the said the digital storage oscilloscope (DSO) is connected to a personal computer through known interface means selected from measurement storage module and interface cables.