# US 4,400,684 A · Fast response temperature sensor

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- Number: US 4,400,684 A
- Document ID: US4400684A
- Status: Granted
- Kind: A
- Application number: 06/297,679
- Filed: 1981-08-31
- Granted: 1983-08-23
- Earliest claimed: 1981-08-31
- Assignees: Ford Motor Company
- Inventors: Toshimoto Kushida; William A. Fate
- Web page: https://patentgrep.com/patent/US4400684A

## CPC

- G01K 1/18: for reducing thermal inertia
- G01K 7/18: the element being a linear resistance, e.g. platinum resistance thermometer (G01K7/26 takes precedence)
- G01K: MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR (radiation pyrometry G01J5/00)

## Abstract

This specification discloses a fast response temperature sensor assembly wherein a surrounding substrate having a low thermal conductivity and low heat capacity is coupled to a fast response temperature sensor. Foam glass is an advantageous material for use as the support substrate.

## Claims

### Claim 1

A fast response temperature sensor assembly including:
a support substrate having a low thermal conductivity, a low heat capacity, and a low density, said support substrate being a glass foam material having a density of about 0.112 grams per cubic centimeter and thermal conductivity of less than 5.5.times.10.sup.2 watt per centimeter degree giving a leakage of about 3.08.times.10.sup.-5 watt.sup.2 sec/cm.sup.4 deg.sup.2 ;
a fast response temperature sensor; and
coupling means for securing said temperature sensor to said support substrate thereby strengthening the mechanical integrity of said fast response temperature sensor assembly.

### Claim 2 (depends on 1)

A fast response temperature sensor assembly as recited in claim 1 further comprising:
a second substrate, attached to said support substrate, having a greater structural rigidity than said support substrate so that said fast response temperature sensor assembly has a further increased structural and mechanical rigidity.

### Claim 3 (depends on 2)

A fast response sensor assembly as recited in claim 2 wherein said second substrate is connected to said support substrate by ceramic cement.

### Claim 4 (depends on 3)

A fast response temperature sensor assembly as recited in claim 3 wherein said coupling means for securing the temperature sensor to said support substrate is a glass frit seal.

### Claim 5

A method for fabricating a fast response temperature sensor comprising the steps of:
forming a glass foam support substrate;
positioning a fast response temperature sensor on the surface of the foam glass substrate; and
attaching the sensor to the foam glass substrate by means of frit seals.

### Claim 6 (depends on 5)

A method as recited in claim 5 further comprising the step of positioning the foam glass substrate on a quartz plate having greater structural strength than the foam glass substrate.

### Claim 7 (depends on 6)

A method as recited in claim 6, further comprising the step of attaching the foam glass substrate to the quartz plate by means of ceramic cement.