Browse Prior Art Database

Human Being Sensor

IP.com Disclosure Number: IPCOM000118448D
Original Publication Date: 1997-Feb-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 4 page(s) / 73K

Publishing Venue

IBM

Related People

Nakada, Y: AUTHOR [+3]

Abstract

Disclosed is an enhanced human being sensor using a conventional infrared contact free sensor. The sensor is originally designed for the sensing of some solid parts, such as electrical/mechanical components and copy papers.

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This is the abbreviated version, containing approximately 60% of the total text.

Human Being Sensor

      Disclosed is an enhanced human being sensor using a
conventional infrared contact free sensor.  The sensor is originally
designed for the sensing of some solid parts, such as
electrical/mechanical components and copy papers.

This invention is intended to apply to human being sensing and
comprises two major implementations as follows:
  o  To use a microcomputer calculated algorithm to extend
      sensing distance to avoid electrical/optical noise
      disturbances.
  o  To use a plurality of sensors for a wide sensing angle.

      Most commercially available optical sensors are using the
traditional Triangle Measuring Method as the basic design.  In
addition, semiconductor photo-diode, high radiation Light Emitting
Diode (LED), and optical lenses are used.  The accuracy of the
Triangle Measuring Method gradually degrades in accordance with
target distance.  This symptom is more evident with the above
mentioned semiconductor-based sensor than the old fashioned telescope
method due to electrical/optical  noises.  Furthermore, the Triangle
Measuring Method senses only distance  (one dimensional); therefore,
it is not suitable for sensing moving targets, such as a human body.

      Fig. 1 shows a typical output characteristic of a sensor, as
gives following two phenomena and an evidence not to be used for
long-distant sensing more than 40 cm if a fixed threshold value is
used.

      DATA fluctuation becoming wid...