EP0423109A1 - Detecteur de hautes frequences - Google Patents

Detecteur de hautes frequences

Info

Publication number
EP0423109A1
EP0423109A1 EP19880901629 EP88901629A EP0423109A1 EP 0423109 A1 EP0423109 A1 EP 0423109A1 EP 19880901629 EP19880901629 EP 19880901629 EP 88901629 A EP88901629 A EP 88901629A EP 0423109 A1 EP0423109 A1 EP 0423109A1
Authority
EP
European Patent Office
Prior art keywords
radio frequency
detector
frequency detector
warning means
electro
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.)
Withdrawn
Application number
EP19880901629
Other languages
German (de)
English (en)
Inventor
John Reginald Fennell
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Publication of EP0423109A1 publication Critical patent/EP0423109A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
    • G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold

Definitions

  • the present invention relates to radio frequency detectors for giving warning of excessive electro-magnetic radiation.
  • electro-magnetic radiation can be extremely harmful to the human body and there is a legal limit to exposure of lOmW/sq.cm.
  • the nature of electro-magnetic radiation is such that there is no physiological response in the human frame to its presence.
  • suitable safety procedures such as, for example screening between a radiation source and personnel.
  • accidents do happen as a result, for example, of incorrect positioning of screening, faulty equipment, incorrect operation of equipment, and non-realisation that equipment is currently in operation.
  • Patent GB 9916** * *6 describes a coil or loop antenna with its ends connected by a diode detection circuit, the output of which is amplified and used-to provide an audio or visual response. Although portable, this device requires positioning and rotation to concentrate on a set direction.
  • Patent GB 1288750 describes a device for testing the operation of AC electrical equipment. This has to be held whilst a search coil is maneouvred.
  • Patents GB 1166977, 1 ⁇ 5 ⁇ 6i7 and 1523731 describe devices which can be carried or worn on the person. However these have not become readily available, perhaps because they can only, in use, detect polarised radio frequencies.
  • GB Patent 1*421365 describes an antenna arrangement which will detect radio frequencies of anypolarisation. It requires, however, three mutually - orthoganol antennas and these cannot be arranged such that they can be carried, or worn by an operator without considerable inconvenience. There is, therefore, a requirement for a device which can be worn on the person in such a way as to not interfere with the persons activities and which will give warning of dangerous levels of non- io ising electro-magnetic radiation in any polarisation.
  • a radio frequency detector adapted to detect electro-magnetic radiation in any polarisation is characterised in having two detector elements siutated at right angles, an amplifier and warning means, the detector being tuned such that the warning means is actuated when the intensity of electro- magnetic radiation exceeds a predetermined level.
  • the detector elements are preferably microwave diodes, which are particularly suitable for detecting radiation in the 2-l6 Gigahertz range.
  • the warning means preferably include a buzzer, a warning light or both.
  • the device also includes means for indicating that it is functioning correctly.
  • the device is preferably powered by a rechargeable battery.
  • FIG 1 is a circuit diagram and Figures 2 and 3 are component layout diagrams.
  • a radio frequency detector suitable for detecting microwaves (Figs 1 and 2) has 2 microwave diodes 10 mounted at right angles to one another. The diodes 10 are connected to an amplifier circuit having amongst other components, a high impedance input amplifier 11 and a booster amplifier 12, and links 13-
  • the device has a driver unit shown generally at 1-- which includes a test point 15, and a 4.8 volt battery 16.
  • a first switch 17 connects the battery into the circuit (as shown in Fig l) or to a power input line l ⁇ .
  • a green light emitting diode 19 is included in the circuit at all times when the battery is in circuit, and a second switch 20 is moveable between an off position (as indicated in Fig l) and an on position, in which current passes through a red light emitting diode 21 and a piezo electric buzzer 22 in response to signals from the microwave diodes 10.
  • the device is adjusted using the links 13 such that the second switch 20 is operated when the microwave diodes 10 detect electro-magnetic radiation in excess of a predetermined value such as, for example, the legal limit of lOmW/sq.cm.
  • the first switch 17 connects the battery l ⁇ to a power source through the connection 18 until the battery l6 is fully charged.
  • the first switch 17 is then moved to the operative position switching the device on, as will be indicated by the green light emitting diode 19.
  • the device is then attached to a suitable portion of a person's clothing such as a lapel or a breast pocket. Should the wearer enter a electro-magnetic radiation field in excess of the predetermined level this will be detected by the microwave diodes 10 which will actuate the second switch 20 causing the red light emitting diode 21 to light and the buzzer 22 to sound giving warning to the wearer that he is in danger. It will be realised that as a r*esultof the microwave diodes 10 being positioned at right angles polarised radiation will be detected whatever the direction of the polarisation relative to the device.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Electromagnetism (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

Un détecteur à micro-ondes comprend deux éléments détecteurs (10), de préférence des diodes à micro-ondes, situés perpendiculairement de manière à détecter un rayonnement dans n'importe quelle polarisation. Les éléments détecteurs (10) sont reliés à l'amplificateur (12) ainsi qu'à des moyens d'avertissement (21, 22), lesquels sont actionnés lorsque le rayonnement perçu dépasse un niveau prédéterminé.
EP19880901629 1988-02-22 1988-02-22 Detecteur de hautes frequences Withdrawn EP0423109A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1988/000110 WO1989007768A1 (fr) 1988-02-22 1988-02-22 Detecteur de hautes frequences

Publications (1)

Publication Number Publication Date
EP0423109A1 true EP0423109A1 (fr) 1991-04-24

Family

ID=10629489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880901629 Withdrawn EP0423109A1 (fr) 1988-02-22 1988-02-22 Detecteur de hautes frequences

Country Status (2)

Country Link
EP (1) EP0423109A1 (fr)
WO (1) WO1989007768A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182262A (en) * 1962-09-07 1965-05-04 Ramcor Inc Densiometer radiation monitoring device
US3473127A (en) * 1966-12-30 1969-10-14 Scope Inc Covert transmitter detector
US3753116A (en) * 1970-10-20 1973-08-14 California Inst Of Techn Pocket size microwave radiation hazard detector
US3828251A (en) * 1972-05-12 1974-08-06 Gen Electric Portable microwave radiation sensing and measuring device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8907768A1 *

Also Published As

Publication number Publication date
WO1989007768A1 (fr) 1989-08-24

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Legal Events

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