Ultrasonic temperature measurement and uses in optical spectroscopy and calorimetry
First Claim
1. A method of investigating a material in a gaseous environment comprising the steps ofimmersing the material in a gaseous environment in the ultrasonic field of a tunable ultrasonic resonator,exchanging energy with the material,tuning the resonator to a desired operating location on a resonance curve, andmeasuring the amount of detuning of the ultrasonic resonator as a measure of the temperature-dependent change of the ultrasonic field resulting from the heat absorbed by or given off by the material from or to the gaseous environment, a characteristic of the material being determined from the amount of detuning of the ultrasonic resonator.
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Accused Products
Abstract
A process and apparatus for the photothermal and/or calorimetric investigation of gaseous, liquid and solid measuring material is based on the detuning of an ultrasonic resonator (1). The latter has an ultrasonic transmitter (2) and an ultrasonic receiver (3), which face one another. The signal from the receiver is analyzed by an analyzer (5) as to its amplitude or phase position which gives, as a result of the temperature dependence of the sonic velocity, information on thermal changes in the ultrasonic resonator designed as a gas cell or calorimeter. The present apparatus makes it possible to detect gases or to calorimetrically investigate the material to be investigated, particularly light-conducting elements (5), such as light fibers.
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Citations
27 Claims
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1. A method of investigating a material in a gaseous environment comprising the steps of
immersing the material in a gaseous environment in the ultrasonic field of a tunable ultrasonic resonator, exchanging energy with the material, tuning the resonator to a desired operating location on a resonance curve, and measuring the amount of detuning of the ultrasonic resonator as a measure of the temperature-dependent change of the ultrasonic field resulting from the heat absorbed by or given off by the material from or to the gaseous environment, a characteristic of the material being determined from the amount of detuning of the ultrasonic resonator.
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14. An apparatus for investigating a material in a gaseous environment comprising the combination of
a calorimeter container; -
means for receiving a material to be investigated in said container; means for adding energy to, or extracting energy from, said material to be investigated; temperature measuring means for measuring the heat given off from or absorbed by the material to be measured, said temperature measuring means comprising first and second ultrasonic transducers having active surfaces for respectively transmitting and receiving ultrasonic energy, means for mounting said transducers on opposite sides of said container with said active surfaces facing each other in spaced relationship so that said transducers form a tuned ultrasonic resonator, means for delivering energy to said first transducer to operate said transducer as the transmitter portion of said resonator, and analyzer means connected to said second transducer operating as a receiver for measuring detuning thereof as a result of temperature changes and as a measure of temperature changes in said container. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification