SE8904144L - DEVICE OF LIGHT RAY PROTECTION - Google Patents

DEVICE OF LIGHT RAY PROTECTION

Info

Publication number
SE8904144L
SE8904144L SE8904144A SE8904144A SE8904144L SE 8904144 L SE8904144 L SE 8904144L SE 8904144 A SE8904144 A SE 8904144A SE 8904144 A SE8904144 A SE 8904144A SE 8904144 L SE8904144 L SE 8904144L
Authority
SE
Sweden
Prior art keywords
transmitter
receiver
pulse train
light ray
relays
Prior art date
Application number
SE8904144A
Other languages
Swedish (sv)
Other versions
SE503145C2 (en
SE8904144D0 (en
Inventor
Gunnar Widell
Mats Linger
Torgny Olsson
Original Assignee
Gunnar Widell
Mats Linger
Torgny Olsson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gunnar Widell, Mats Linger, Torgny Olsson filed Critical Gunnar Widell
Priority to SE8904144A priority Critical patent/SE503145C2/en
Publication of SE8904144D0 publication Critical patent/SE8904144D0/en
Priority to PCT/SE1990/000008 priority patent/WO1990008333A1/en
Publication of SE8904144L publication Critical patent/SE8904144L/en
Publication of SE503145C2 publication Critical patent/SE503145C2/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers

Landscapes

  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The safety installation opens circuit relays (53,73) if a light beam (46) between a transmitter (40) and receiver (60) is interrupted. An oscillator (25) pulse train is supplied to the transmitter and to two test units (45,65) respectively coupled to the transmitter and receiver. Each unit compares the pulse train with that (61) operated by the receiver (60). If the compared trains have the same frequency, and an inverted or phase reversed signal pattern, with or without phase displacement, the test unit outputs maintain the relays (53,73) closed.
SE8904144A 1988-11-04 1989-12-08 Safety switch operative upon light beam interruption SE503145C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE8904144A SE503145C2 (en) 1989-12-08 1989-12-08 Safety switch operative upon light beam interruption
PCT/SE1990/000008 WO1990008333A1 (en) 1988-11-04 1990-01-04 Safety guard beam light switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8904144A SE503145C2 (en) 1989-12-08 1989-12-08 Safety switch operative upon light beam interruption

Publications (3)

Publication Number Publication Date
SE8904144D0 SE8904144D0 (en) 1989-12-08
SE8904144L true SE8904144L (en) 1991-06-09
SE503145C2 SE503145C2 (en) 1996-04-01

Family

ID=20377723

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8904144A SE503145C2 (en) 1988-11-04 1989-12-08 Safety switch operative upon light beam interruption

Country Status (1)

Country Link
SE (1) SE503145C2 (en)

Also Published As

Publication number Publication date
SE503145C2 (en) 1996-04-01
SE8904144D0 (en) 1989-12-08

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