GB2244560A - Electro-magnetic field strength gauge - Google Patents

Electro-magnetic field strength gauge Download PDF

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Publication number
GB2244560A
GB2244560A GB9012051A GB9012051A GB2244560A GB 2244560 A GB2244560 A GB 2244560A GB 9012051 A GB9012051 A GB 9012051A GB 9012051 A GB9012051 A GB 9012051A GB 2244560 A GB2244560 A GB 2244560A
Authority
GB
United Kingdom
Prior art keywords
field strength
magnetic field
strength gauge
receiving element
enclosure
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Withdrawn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
GB9012051A
Other versions
GB9012051D0 (en
Inventor
Michael Anthony Butler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9012051A priority Critical patent/GB2244560A/en
Publication of GB9012051D0 publication Critical patent/GB9012051D0/en
Publication of GB2244560A publication Critical patent/GB2244560A/en
Withdrawn legal-status Critical Current

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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
    • G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
    • G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

A field strength gauge, assembled in a "hand held" enclosure (10), includes two indicating devices (12 & 13) and a field-sensing element (11) e.g. a coil or a Hall device. This allows the user to determine the direction and field strength of a selected Electro Magnetic Field, e.g. of low frequency, the brightness of the indicators (12, 13) indicating the field strength. The indicators (12, 13) act as a single indicating device, as in Fig 2 i.e. giving the same indication. <IMAGE>

Description

ELECTRO/MAGNETIC FIELD STRENGTH GAUGE This invention relates to an Electro-Magnetic Field Strength Meter.
Electro-Magnetic Fields possess three principle properties:frequency, field strength and direction, existing in any angle of three dimensional space.
A Field Strength Meter is a known device, usually portable and battery powered. It displays on a single digital or analogue meter, for a pre-selected frequency and bandwidth, the field strength in the direction of a receiving element.
Field Strength Meters are however, relatively expensive, limited to measuring the field strength in the direction of an external receiving element by a technically experienced operator and can only be viewed physically in a stable direction determined by the single meter provided.
According to the present invention there is provided a Field Strength Gauge, that is primarily intended for low/extremely low frequency electro-magnetic fields and can for any given location be easily manipulated for maximum field strength and read by a non techincal person. The Field Strength Gauge comprises of a small enclosure. Mounted within is a receiving element, electronic circuit tuned to the selected frequency/ bandwidth powering both indicating devices and a battery source. Externally there is an on/off switch and two indicating devices mounted on the same latitude, 90 degrees apart. The brightness of these is proportional to the field strength and within tolerance identical.
A specific embodiment of the invention will now be described by way of example with reference to accompanying drawing in which: Figure 1 shows in perspective, the Field Strength Gauge Figure 2 shows a representative block diagram of a functioning circuit.
Referring to the drawing Fig 1, the Gauge comprises of an enclosure 10 incorporating a battery housing (not shown), secured inside is a receiving element 11, an on/Qff switch 14 mounted on and through the enclosure 10 and two indicating devices 12 and 13 mounted such that 12 is on the surface and 13 is on the side face in line to each other. This establishes a fixed geometry between the indicating devices 12 and 13 and the receiving element 11.
The block diagram of fig 2 is a representative circuit to demonstrate this invention. The receiving element 11 can be a coil type construction or of a "Kall effect" type semi conductor device. This is followed by a pre amplifier/ bandpass filter 15, an amplifier/limiter 16designed to protect the indicating devices from being over driven, a precision rectifier/integrator 17 provides a fast charge/ slow discharge response, a voltage controlled current source 18 to power the indicating devices 12 and 13. Light emitting diodes are used for this representation.
The pre amplifier/bandpass filter 15 and coil, if used for the receiving element 11, must be chosen for optimum characteristics dependent on the frequency and bandwidth selected. Also the overall circuit has to be protected from the coil being overdriven electro-magnetically.

Claims (7)

1 An Electro Magnetic Field Strength Gauge comprising of an enclosure incorporating a secured receiving element, two secured indicating devices and electronic circuitry. One indicating device is mounted on one dimension of the enclosure and the other indicating device is mounted on another dimension of the enclosure, this establishes with the receiving element a fixed geometry between the two indicating devices and the receiving element. With information derived from the receiving element and control from the electronic circuitry both indicating devices perform electrically, within tolerance as a single indicating device.
2 An Electro Magnetic Field Strength Gauge as claimed in Claim 1, wherein the receiving element is a coil.
3 An Electro Magnetic Field Strength Gauge as claimed in Claim 1, wherein the receiving element is a "Hall Effect" type semi conductor device.
4 An Electro Magnetic Field Strength Gauge as claimed in any preceding claim, wherein the two display devices are mounted on the enclosure, for example 90 degrees apart and on the same latitude, such that one device is on the surface and the other device is mounted on the side face of the enclosure.
5 An Electro Magnetic Field Strength Gauge as claimed in any preceding claim, wherein the display devices are, for example, Light Emitting Diodes and the brightness of these L.E.D. devices is proportional to the field strength.
6 An Electro Magnetic Field Strength Gauge as claimed in any preceding claim, wherein there are two or more Gauges, housed in a single enclosure.
7 An Electro Magnetic Field Strength Gauge as described herein with reference to Figures 1 and 2 of the accompanying drawing.
GB9012051A 1990-05-30 1990-05-30 Electro-magnetic field strength gauge Withdrawn GB2244560A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9012051A GB2244560A (en) 1990-05-30 1990-05-30 Electro-magnetic field strength gauge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9012051A GB2244560A (en) 1990-05-30 1990-05-30 Electro-magnetic field strength gauge

Publications (2)

Publication Number Publication Date
GB9012051D0 GB9012051D0 (en) 1990-07-18
GB2244560A true GB2244560A (en) 1991-12-04

Family

ID=10676773

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9012051A Withdrawn GB2244560A (en) 1990-05-30 1990-05-30 Electro-magnetic field strength gauge

Country Status (1)

Country Link
GB (1) GB2244560A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5309097A (en) * 1992-04-15 1994-05-03 Enrique Rodriguez Video display terminal magnetic field detector
GB2328517A (en) * 1997-06-19 1999-02-24 Wandel & Goltermann Management Electromagnetic field measuring and alarm device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2073896A (en) * 1980-04-03 1981-10-21 Consiglio Nazionale Ricerche Instrument for monitoring the hazard arising from electric and magnetic radio frequency fields
GB2194865A (en) * 1986-08-18 1988-03-16 Secr Defence Radio frequency detector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2073896A (en) * 1980-04-03 1981-10-21 Consiglio Nazionale Ricerche Instrument for monitoring the hazard arising from electric and magnetic radio frequency fields
GB2194865A (en) * 1986-08-18 1988-03-16 Secr Defence Radio frequency detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5309097A (en) * 1992-04-15 1994-05-03 Enrique Rodriguez Video display terminal magnetic field detector
GB2328517A (en) * 1997-06-19 1999-02-24 Wandel & Goltermann Management Electromagnetic field measuring and alarm device
US5955954A (en) * 1997-06-19 1999-09-21 Wandel & Goltermann Management Holding Gmbh Warning and measuring device for personal protection in electromagnetic fields
GB2328517B (en) * 1997-06-19 2001-11-21 Wandel & Goltermann Man Holdin Warning and measuring device for personal protection in electromagnetic fields

Also Published As

Publication number Publication date
GB9012051D0 (en) 1990-07-18

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)