Browse Prior Art Database

Technique to Detect Varied Reflective Materials

IP.com Disclosure Number: IPCOM000121377D
Original Publication Date: 1991-Aug-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Addiss, WD: AUTHOR [+3]

Abstract

The disclosed technique provides a method of detecting and discriminating materials with similar reflective values as each material overlays the other in a holding tray.

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Technique to Detect Varied Reflective Materials

      The disclosed technique provides a method of detecting
and discriminating materials with similar reflective values as each
material overlays the other in a holding tray.

      Referring to Fig. 1, green sheet 1 overlays spacer 2 in holding
tray 3.  A combination thermal infrared sensor 4 and an optical
infrared sensor 5 is integrated with the TTL logic shown in Fig. 2.
The thermal sensor 4 is locked into set points via the thermal sensor
controller 6 to distinguish the materials, such as green sheet and
spacer, with the highest thermal infrared reflectivity differential.

      Introducing materials with matching thermal infrared
reflectivities or within 10% of each other allows optical infrared
sensor 5 to discriminate materials with less than a 10% differential
in thermal reflectivity values.

      The combination of these two sensors and TTL logic allows a
variety of materials with varied reflectivities to be detected
reliably.  Fig. 3 shows a typical truth table for a three-material
system.