Title: Temperature measurement

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Claims: We claim:

1. Apparatus for measuring the core temperature within a body, in a region thereof which is inaccessibly remote from the outer surface of the body, in an instance where the body exhibits a fall in temperature from said region to said surface, comprising:

a sandwich assembly of two temperature sensors separated by a layer of material resistant to thermal conduction which extends in continuous manner laterally beyond the sensors to form an annulus around said sensors having lateral dimensions of at least equal order to those of said sensors;

said sandwich being superposed by an electrical heating element; control means operable in response to a temperature measurement differential indicate by said sensors to energise said heating element to annul said differential, said control means comprising means to energise said heating element continuously to elevate the temperature at one of said sensors to a predetermined high level; and

switch means operable thereafter to put said temperature differential annulling operation into effect.

2. Apparatus according to claim 1 wherein said switch means is operated automatically in response to attainment of said high level temperature by said one sensor.

3. Apparatus according to claim 2 wherein said control means is operable to re-establish continuous energisation of said heating element, following operation of said switch means, in response to attainment of a predetermined low level temperature by one of said sensors.

4. Apparatus according to claim 1 wherein said one sensor is that further from said heating element.

Other info:

Inventors: Fox, Ronald Howard (Chorley Wood, EN)
Solman, Arthur James (London, EN)

Application Number: 138916
Filing Date: 1971-04-30
Publication_date: 1976-01-20
Assignee: National Research Development Corporation (London, EN)
Primary Class(es): 374/134 600/549
Other Classes:
US Patent Ref:

2798377	Jul, 1957	Brownlee et al.	73/342.
3217538	Nov, 1965	Loeb	73/DIG.
3321974	May, 1967	Sterbutzel	73/359.
3332285	Jul, 1967	Cook	73/359.
3435400	Mar, 1969	Beckman	73/362.

Other Refs:
Primary Examiner: Queisser, Richard C.
Assistant Examiner: Shoon, Frederick
Attorney: Cushman, Darby and Cushman