CA1311527C - Systeme d'alarme-incendie electromagnetique pour mine souterraine - Google Patents

Systeme d'alarme-incendie electromagnetique pour mine souterraine

Info

Publication number
CA1311527C
CA1311527C CA000579775A CA579775A CA1311527C CA 1311527 C CA1311527 C CA 1311527C CA 000579775 A CA000579775 A CA 000579775A CA 579775 A CA579775 A CA 579775A CA 1311527 C CA1311527 C CA 1311527C
Authority
CA
Canada
Prior art keywords
warning system
mine
signal
ultra
antenna
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
CA000579775A
Other languages
English (en)
Inventor
Kenneth E. Hjelmstad
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
US Department of the Interior
Original Assignee
US Department of the Interior
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 US Department of the Interior filed Critical US Department of the Interior
Application granted granted Critical
Publication of CA1311527C publication Critical patent/CA1311527C/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B11/00—Transmission systems employing ultrasonic, sonic or infrasonic waves

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Alarm Systems (AREA)
  • Fire Alarms (AREA)
CA000579775A 1988-05-02 1988-10-11 Systeme d'alarme-incendie electromagnetique pour mine souterraine Expired - Lifetime CA1311527C (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US20123588A 1988-05-02 1988-05-02
US201,235 1988-05-02

Publications (1)

Publication Number Publication Date
CA1311527C true CA1311527C (fr) 1992-12-15

Family

ID=22745035

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000579775A Expired - Lifetime CA1311527C (fr) 1988-05-02 1988-10-11 Systeme d'alarme-incendie electromagnetique pour mine souterraine

Country Status (4)

Country Link
AU (1) AU618088B2 (fr)
CA (1) CA1311527C (fr)
GB (1) GB2220823A (fr)
ZA (1) ZA893125B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2254528A (en) * 1991-03-19 1992-10-07 Axl Systems Ltd Miners lamp communicator
WO2007124538A1 (fr) 2006-04-28 2007-11-08 Orica Explosives Technology Pty Ltd Procédés de commande de composants d'appareils de tir, appareils de tir et composants de ceux-ci
US7796943B2 (en) 2007-03-28 2010-09-14 Lockheed Martin Corporation Sub-surface communications system and method
US8232888B2 (en) 2007-10-25 2012-07-31 Strata Proximity Systems, Llc Interactive magnetic marker field for safety systems and complex proximity warning system
US7903041B2 (en) 2008-05-01 2011-03-08 Lockheed Martin Corporation Magnetic antenna apparatus and method for generating a magnetic field
CN113745732B (zh) * 2021-09-02 2023-05-30 深圳市德昶科技有限公司 一种基于内置天线应用于矿井的定位装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1257299A (fr) * 1969-04-25 1971-12-15
US3740488A (en) * 1971-01-13 1973-06-19 Westinghouse Electric Corp Inductive loop through-the-earth communication system

Also Published As

Publication number Publication date
GB2220823A (en) 1990-01-17
AU3388489A (en) 1989-11-02
AU618088B2 (en) 1991-12-12
GB8909870D0 (en) 1989-06-14
ZA893125B (en) 1990-02-28

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Legal Events

Date Code Title Description
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