Mounting and isolation system for tuning fork temperature sensor

• US 4,706,259 A
• Filed: 12/30/1985
• Issued: 11/10/1987
• Est. Priority Date: 12/30/1985
• Status: Expired due to Fees

• Current Assignee: Alliedsignal Inc.
• Original Assignee: Sundstrand Data Control, Inc.
• Inventors: Tonn, Jeffrey F., Paros, Jerome M., Wearn, Richard B. Jr.
• Primary Examiner(s): YASICH, DANIEL
• Application Number:
  US06/815,352
• Time in Patent Office: 680 Days
• Field of Search: 374/117, 337/156, 310/25, 310/321
• US Class Current: 374/117
• CPC Class Codes: G01K 7/32 using change of resonant frequency of a crystal

Abstract

Prior mounting systems for tuning fork temperature sensors have resulted in unpredictable activity dips within the sensor operating ranges. This problem is eliminated by the mounting and isolation system (32) of the present invention that is adapted to mount temperature sensitive tuning fork (20) to a support structure. The mounting system comprises a mounting member (34) adapted for rigid connection to the support structure, and support means (36) connecting the tuning fork base to the mounting member such that the tuning fork is supported solely by the support means. The support means comprises a low pass mechanical filter that transmits only vibration frequencies that are less than the operating range of frequencies of the tuning fork.

Claims

1. A mounting and isolation system for a tuning fork temperature sensor that includes a tuning fork having a frequency of oscillation that is a function of temperature, the mounting and isolation system comprising a mounting member having a surface shaped so as to permit the mounting member to be rigidly connected to an external support, and an elongated support structure connecting a selected point on the tuning fork to the mounting member such that the tuning fork is supported solely by the support structure, the dimensions of the support structure selected so as to comprise a low pass mechanical filter that is adapted to transmit only vibration frequencies that are less than the operating range of frequencies of the tuning fork.

2. The mounting and isolation system of claim 1, wherein the support structure comprises a single beam.

3. The mounting and isolation system of claim 1, wherein the support structure comprises a variable width beam formed by a pair of back-to-back arcuate recesses.

4. The mounting and isolation system of claim 1, wherein the support structure comprises two spaced apart beams.

5. The mounting and isolation system of claim 1, wherein the tuning fork, mounting member and support structure are fabricated from a single wafer of crystalline quartz.