Browse Prior Art Database

Optical Reflection Thermometer

IP.com Disclosure Number: IPCOM000093069D
Original Publication Date: 1967-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Banks, WK: AUTHOR

Abstract

A noncontact thermometer, as shown in drawing 4, detects color changes in materials such as silicone rubber with a change in temperature. For example, several silicone rubbers such as DOW* RTV3116 and GE** RTV 30, 106, 630 and 634 exhibit color change properties. RTV 30 and 106 become darker as the temperature is elevated from room temperature. The other silicone rubbers become whiter. *Trademark of Dow Chemical Company **Trademark of General Electric Company.

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Optical Reflection Thermometer

A noncontact thermometer, as shown in drawing 4, detects color changes in materials such as silicone rubber with a change in temperature. For example, several silicone rubbers such as DOW* RTV3116 and GE** RTV 30, 106, 630 and 634 exhibit color change properties. RTV 30 and 106 become darker as the temperature is elevated from room temperature. The other silicone rubbers become whiter. *Trademark of Dow Chemical Company **Trademark of General Electric Company.

In drawing 1, reflectance versus wavelength is plotted for a silicone rubber, such as RTV 30, at room temperature and at an elevated temperature. Between the wavelength range of .52 and .69 microns there is a substantial reflectance differential between the room temperature silicone and the silicone at the elevated temperature. This is also shown in drawing 2 in which reflectance is plotted versus temperature ranging from 25 degrees C to 230 degrees C. Depending upon the wavelength, the reflectance either decreases, increases, or stays the same. This is again shown in drawing 3 in which the starting temperature is below room temperature, i. e., -20 degrees C.

With a material having the above properties, material 1, as shown in drawing 4, can be coated on an element 2 whose temperature is to be measured. Then, to monitor the temperature, there can be employed the device having light source 3 and detecting solar cells 4 having their output coupled to a microammeter, calibrated i...