Tactile sensor

• US 4,964,302 A
• Filed: 09/25/1984
• Issued: 10/23/1990
• Est. Priority Date: 09/25/1984
• Status: Expired due to Term

• Current Assignee: Bonneville Scientific Incorporated
• Original Assignee: Allen R. Grahn, Lynn Astle
• Inventors: Astle, Lynn, Grahn, Allen R.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/653,904
• Time in Patent Office: 2,219 Days
• Field of Search: 73/DIG. 4, 73/862.04, 73/862.64, 73/432 T, 73/62, 73/628, 73/629, 73/703, 310/338, 310/800, 901/33, 901/46, 33/125 W
• US Class Current: 73/865.7
• CPC Class Codes: G01B 17/04 for measuring the deformation in a solid, e.g. by vibrating string
• CPC Class Codes: G01L 1/255 using acoustic waves, or acoustic emission G01L1/10 and G01L1/16 take precedence
• CPC Class Codes: G01L 11/04 by acoustic means
• CPC Class Codes: G01N 2291/02827 Elastic parameters, strength or force
• CPC Class Codes: G01N 2291/02854 Length, thickness
• CPC Class Codes: G01N 2291/02872 Pressure
• CPC Class Codes: G01N 29/07 by measuring propagation velocity or propagation time of acoustic waves
• CPC Class Codes: Y10S 310/80 Piezoelectric polymers, e.g. PVDF

Abstract

A sensor comprising a deformable medium, such as rubber, an ultrasonic transducer for transmitting a signal through the medium to a face of the medium and for sensing an echo of the signal returned from the face through the material to the transducer and circuit means for determining the time differential between transmission of the signal and return of the echo and for converting the time signal into a distance measurement.

Claims

1. A sensor comprising

a deformable medium;

ultrasonic transducer means for transmitting an ultrasonic signal at one point into the said medium and for receiving an echo returned after said ultrasonic signal has been transmitted and returned from a surface of the medium opposite said one point; and

current means for determining the time differential between transmission of the signal and the receipt of the echo and for converting said time differential into a distance measurement for determining deformation of the medium and for determining the echo polarity.

2. A sensor as in claim 1, wherein the deformable medium comprises a layer of resilient material.

3. A sensor as in claim 2, wherein the layer of resilient material is an elastomer.

4. A sensor as in claim 3, wherein the layer of resilient material is rubber.

5. A sensor as in claim 3, wherein the layer of resilient material is silicone rubber.

6. A sensor as in claim 3, wherein the layer of resilient material is natural rubber.

7. A sensor as in claim 3, wherein the layer of resilient material is synthetic rubber.

8. A sensor as in claim 1, wherein the ultrasonic transducer means comprises

a layer of polyvinylidene fluoride.

9. A sensor as in claim 2, wherein the ultrasonic transducer means comprises

a layer of polyvinylidene fluoride.