SE8306817L - DEVICE FOR THE DETECTION OF PROMOTING SUBSTANCES - Google Patents

DEVICE FOR THE DETECTION OF PROMOTING SUBSTANCES

Info

Publication number
SE8306817L
SE8306817L SE8306817A SE8306817A SE8306817L SE 8306817 L SE8306817 L SE 8306817L SE 8306817 A SE8306817 A SE 8306817A SE 8306817 A SE8306817 A SE 8306817A SE 8306817 L SE8306817 L SE 8306817L
Authority
SE
Sweden
Prior art keywords
aerial
water
receiver
underwater
input
Prior art date
Application number
SE8306817A
Other languages
Swedish (sv)
Other versions
SE8306817D0 (en
SE453619B (en
Inventor
Sven Ramstrom
Original Assignee
Sven Ramstrom
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 Sven Ramstrom filed Critical Sven Ramstrom
Priority to SE8306817A priority Critical patent/SE453619B/en
Publication of SE8306817D0 publication Critical patent/SE8306817D0/en
Publication of SE8306817L publication Critical patent/SE8306817L/en
Publication of SE453619B publication Critical patent/SE453619B/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/30—Assessment of water resources

Abstract

An Omega station transmits radio signals and at least one underwater aerial with connected receiver (1) is tuned to the signal frequency. An electronic changeover unit has an input for an above-water aerial, and one for each of these below water level. It also has an output connected to the receiver aerial input. Changeover between the receiver input from the two aerials occurs on a short time period basis, and a phase-sensitive circuit is provided which compares the phases of the signals from the aerials above and below water. An alarm circuit is activated when the phase of the signal, received from the underwater aerial varies in relation to that received from the above water aerial. The below-water aerial is of the long loop type which with its end turned towards the radio receiver is connected to an adjuster for turning purposes. Thus, signals received from this aerial have the same phase as those from the above-water aerial when no object passes within the vicinity of the underwater aerial.
SE8306817A 1983-12-09 1983-12-09 Detection device for underwater objects SE453619B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE8306817A SE453619B (en) 1983-12-09 1983-12-09 Detection device for underwater objects

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8306817A SE453619B (en) 1983-12-09 1983-12-09 Detection device for underwater objects

Publications (3)

Publication Number Publication Date
SE8306817D0 SE8306817D0 (en) 1983-12-09
SE8306817L true SE8306817L (en) 1985-06-10
SE453619B SE453619B (en) 1988-02-15

Family

ID=20353666

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8306817A SE453619B (en) 1983-12-09 1983-12-09 Detection device for underwater objects

Country Status (1)

Country Link
SE (1) SE453619B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI910512A (en) * 1991-02-01 1992-08-02 Esko Antero Hirvonen Kontrollsystem.

Also Published As

Publication number Publication date
SE8306817D0 (en) 1983-12-09
SE453619B (en) 1988-02-15

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