Abstract A thermometer which measures temperature by the time taken by a sound pulse to travel along a probe. The sound pulse emanates from a transducer coil and magnetostrictive element and travels in two opposite directions. One direction is toward a terminal mass polarized by a magnet where the sound is reflected by the terminal mass and so phased to increase the pulse width at the point of emanation. The other direction of the pulse is toward a probe by way of the magnetostrictive element itself and a transmission line. Reflections from the two ends of the probe are sensed and the time between the reflected pulses from the ends of the probe is measured as function of temperature. The magnetostrictive element is preferably twisted along its length.
Inventors
👤 Eric George Herbert Mobsby
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-31 05:30
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/22; G01K11/24
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
98 words
A thermometer for measuring the speed of sound as an indication of temperature comprising an elongate magnetostrictive element; an electromagnetic transducer for initiating sonic pulses in the magnetostrictive element, said pulses travelling in said element in both forward and rearward directions, a temperature sensor, a transmission line coupled to said element for leading the forward going pulses to said temperature sensor and for returning echoes from said temperature sensor, means for receiving said returning echoes and means for reflecting the rearward going pulses such that the reflected pulses combine with forward going pulses to increase the pulsewidths thereof.
Claim 2
Dependent Claim
98 words
A thermometer for measuring the speed of sound as an indication of temperature comprising an elongate magnetostrictive element; an electromagnetic transducer for initiating sonic pulses in the magnetostrictive element, said pulses travelling in said element in both forward and rearward directions, a temperature sensor, a transmission line coupled to said element for leading the forward going pulses to said temperature sensor and for returning echoes from said temperature sensor, means for receiving said returning echoes and means for reflecting the rearward going pulses such that the reflected pulses combine with forward going pulses to increase the pulsewidths thereof.
Claim 3
Dependent Claim
25 words
A thermometer as claimed in claim 1 in which said means for reflecting the rearward going pulses is a polarizing magnet for said magnetostrictive element.