Fast response temperature sensor

• US 4,134,095 A
• Filed: 12/05/1977
• Issued: 01/09/1979
• Est. Priority Date: 12/05/1977
• Status: Expired due to Term

• Current Assignee: Siemens-Bendix Automotive Electronics LP
• Original Assignee: The Bendix Corporation (Honeywell International Inc.)
• Inventors: Reddy, Junuthula N.
• Primary Examiner(s): Albritton, C. L.
• Application Number:
  US05/857,559
• Time in Patent Office: 400 Days
• Field of Search: 338/22 R, 338/22 SD, 338/25, 338/28, 338/30, 73/362 AR, 73/27 R, 357/28
• US Class Current: 338/25
• CPC Class Codes: G01K 1/18 for reducing thermal inertia
• CPC Class Codes: H01C 7/04 having negative temperature coefficient thermometers using resistive elements G01K7/16

Abstract

A fast response fluid temperature sensor is disclosed which consists of a silicon temperature sensing semiconductor chip mounted on an extremely thin fin having a high surface area to mass ratio. The fin and chip combination are mounted in a frame assembly, with the thermal conductivity of the frame assembly being high and the specific heat being low for maximum heat transfer from the fluid being sensed to the silicon chip. The chip and fin assembly are illustrated as being open to the free flow of fluid around the assembly, no insulating material is provided between the fluid media being sensed and the fin and chip assembly, and a protective cage is formed around the fin and chip assembly. Suitable connection is made between one electrical terminal of the chip and the fin and between the other electrical terminal of the chip and the external circuitry, with various modified forms of such connections being illustrated.

Claims

1. A temperature sensor for sensing the temperature of a fluid comprising a base member having at least first and second support arms thereon, fin means formed of a thin disc having a high surface area to mass ratio fixedly mounted said first and second support arms whereby the fluid to be sensed may flow over the top and bottom surface of said fin means, semiconductor means centrally located and mounted on said fin means having the characteristic of changing resistance with changes in temperature, a first output conductor connected to said fin means and embedded in said first support arm, a second output conductor embedded in said second support arm, said first conductor having an end portion thereof in electrical contact with said fin means, insulating means positioned on said fin means between said semiconductor means and an edge of said fin means and separated from said semiconductive means, a third conductor supported on and within the confines of the surface of said insulating means, and bridging conductive means supported in electrical contact with said third conductor and a surface of said semiconductor means and spaced from said fin means for electrically connecting said conductor and said semiconductor means, the end of said second conductor being in electrical contact with said third conductor.

2. The improvement of claim 1 further including a relatively open cage means fixedly mounted in surrounding relation to said fin means and said semiconductor means.

3. The improvement of claim 2 wherein said cage means is formed of plural wires each having a generally U-shape, said wires being closer in proximity to each other at the apex of said U-shape.

4. The improvement of claim 1 wherein said bridging conductive means is integrally formed with said third conductive means.