Optical fiber tactile sensor

• US 4,405,197 A
• Filed: 11/25/1980
• Issued: 09/20/1983
• Est. Priority Date: 11/25/1980
• Status: Expired due to Term

• Current Assignee: Jet Propulsion Laboratory (Government of the United States of America), United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Original Assignee: United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration
• Inventors: Bejczy, Antal K.
• Primary Examiner(s): Lee, John D.
• Application Number:
  US06/210,405
• Time in Patent Office: 1,029 Days
• Field of Search: 350/96.10, 350/96.15, 350/96.16, 350/96.20, 250/227, 3/12, 3/12.8, 3/1.1, 73/716, 73/432 T
• US Class Current: 385/15
• CPC Class Codes: G01L 1/247 using distributed sensing elements, e.g. microcapsules along a single optical fibre G01L1/242
• CPC Class Codes: G01L 5/228 using tactile array force sensors
• CPC Class Codes: H03K 17/969 having a plurality of control members, e.g. keyboard

Abstract

A tactile sensor comprises an array of cells which are covered by an elastic membrane, having an exposed surface which is adapted to come in contact with an object. Light is conducted to each cell from a light source by an optical fiber which terminates at the cell. Reflected light from the cell is conducted by an optical fiber to a light processor, which senses changes in the light received thereby from an ambient level whenever an object comes in contact with the membrane surface above the cell.

Claims

1. A tactile sensor comprising:

structure means including elastic means, and defining an array of a plurality of enclosed cells, each cell including a top side, defined by a surface area of a first surface of said elastic means, the latter having a second surface, opposite said first surface, said second surface being exposed and adapted to come in contact with an object whereby the height of a cell is affected by depression of said elastic means;

light source means;

first light conducting means connected to said light source means and terminating at each of said cells for conducting light into each cell;

light processing means; and

second light conducting means spaced apart from said first light conducting means and connected to said light processing means and terminating at each of said cells for conducting light from each cell to said light processing means.

2. The sensor described in claim 1 wherein:

said structure means includes an elastic membrane forming said elastic means, and a solid material forming a plurality of cavities covered by said elastic membrane.

3. The sensor described in claim 1 wherein:

said array of cells is arranged in X rows and Y columns;

said light source means includes X light source each associated with one of said rows and said light conducting means is constructed to carry light from one of said light sources to all cells of a row at the same time; and

said light processing means includes Y light detectors, and said second light conducting means is constructed to carry light from all cells of a column at the same time to one of said light detectors.