Large area temperature sensor

A technology of sensing devices and thermal variable resistors, applied in thermometers, temperature maps, resistors with negative temperature coefficients, etc., can solve problems such as low visibility and blurred vision

Inactive Publication Date: 2014-12-10
PST SENSORS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While an advantage, for some applications of non-contact measurements, this often has disadvantages due to factors such as extraneous radiation, low visibility and blurring of the field of view, transparency of materials, and variations in emissivity and reflectivity. Variety

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Embodiment Construction

[0021] The present invention relates to temperature sensing devices and methods of making such devices. Specifically, the device can be a large-area negative temperature coefficient thermistor fabricated by printing technology on a thin substrate that can be cut to a size that does not affect the characteristics of the device. This relates in particular to thermistors having a negative temperature coefficient of resistance, commonly referred to as NTC thermistors, which means that the resistance of said thermistors decreases approximately exponentially with increasing temperature.

[0022] Accordingly, the present invention relates to the use of thermistors, and in particular to the use of printed negative temperature coefficient (NTC) thermistors, which can be applied as a single large area sensor to determine average temperature, or as a A temperature sensing array as described in co-pending provisional patent application "Thermal Imaging sensor," filed January 30, 2012, whe...

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Abstract

A sensing device is made up of a network of nominally identical temperature dependent resistors which is topologically equivalent to a square resistor network. The device has terminals at which an average resistance value thereof can be measured. The resistors are supported on a substrate which can be reduced in size from an initial size without substantially changing the average resistance value. In preferred embodiments, a pattern of contacts and conductive tracks joining the contacts are printed on a substrate, and a material having a temperature dependent resistance is applied over the contacts to define a network of interconnected thermistors. Alternatively, the material can be applied to the substrate first and the contacts and tracks printed on it.

Description

technical field [0001] The present invention relates to temperature sensing devices and methods of making such devices. Background technique [0002] In many applications, such as engineering, health care, packaging and transportation, it is desirable to obtain the temperature of large irregularly shaped objects or complex structures whose shape or structure changes or is caused to change in different states quantitative information. For example, such an object may be made of a thin flexible material such as fabric, polymer film or paper, or may be a rigid or malleable part constructed of metal, plastic or a combination of materials. Optionally, sensors may be required to determine the average temperature over a specific portion, eg in a control room or chamber, or a larger area in a refrigeration unit. [0003] A common method used for this measurement is infrared or visible thermography, in which the thermal radiation emitted by the object is recorded by a digital camera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/24G01K3/00H01C1/148
CPCG01K7/24H01C7/04G01K2213/00G01K3/06H01C7/008H01C7/02H01C1/16H01C13/02G01K1/14
Inventor 大卫·托马斯·布里顿马尔吉特·黑廷
Owner PST SENSORS
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