GB2194865A - Radio frequency detector - Google Patents
Radio frequency detector Download PDFInfo
- Publication number
- GB2194865A GB2194865A GB08620067A GB8620067A GB2194865A GB 2194865 A GB2194865 A GB 2194865A GB 08620067 A GB08620067 A GB 08620067A GB 8620067 A GB8620067 A GB 8620067A GB 2194865 A GB2194865 A GB 2194865A
- Authority
- GB
- United Kingdom
- Prior art keywords
- radio frequency
- radiation
- electro
- detector
- frequency detector
- 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- Withdrawn
Links
- 230000005670 electromagnetic radiation Effects 0.000 claims description 20
- 230000005855 radiation Effects 0.000 claims description 12
- 238000010586 diagram Methods 0.000 claims description 4
- 230000009931 harmful effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 210000000481 breast Anatomy 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000006461 physiological response Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 238000010792 warming Methods 0.000 abstract 1
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Emergency Alarm Devices (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
A portable radio frequency detector suitable for carrying attached to a lapel or a pocket has two microwave diodes (10) situated at right angles and connected to audible (22) and/or illuminated (21) warming means. The detector has a re-chargeable battery (16). <IMAGE>
Description
SPECIFICATION
Radio frequency detector
The present invention relates to radio frequency detectors for giving warning of excessive electro-magnetic radiation.
Many modern activities involve the production of electro-magnetic radiation-for example radio, radar and television transmission, many manufacturing processes, and even the household micro-wave oven which is becoming increasingly popular. Excessive electromagnetic radiation can be extremely harmful to the human body and there is a legal iimit to exposure of 10mW/sq.cm. The nature of electro-magnetic radiation is such that there is no physiological response in the human frame to its presence. Fortunately sources of potentially damaging levels of radiation are readily identifiable and harmful effects can be avoided by suitable safety procedures such as, for example screening between a radiation source and personnel.However 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. There is, therefore, a requirement for a device which will give warning to persons operating in the neighbourhood of non ionising electro-magnetic radiation transmitting equipment of the presence of dangerous radiation.
According to the present invention a radio frequency detector has detector means adapted to detect electro-magnetic radiation in any polarisation, 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. In one form of the invention suitable for detecting radiation in the range 2-16 Gigahertz the detection means includes two micro wave diodes situated at right angles to one another.
The warning means preferably include a buzzer, a warning light or both. In a preferred form of the invention the device also includes means for indicating that it is functioning correctly.
The device is preferably powered by a rechargeable battery.
One embodiment of the invention, suitable for detecting radiation in the range 2-16 Gighertz, will now be described, by way of example only, with reference to the accompanying diagrammatic drawings of which:
Figure 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 14 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. 1) or to a power input line 18. 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. 1) 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. In use 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 10mW/sq.cm.The first switch 17 connects the battery 16 to a power source through the connection 18 until the battery 16 is full 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 electromagnetic 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 realized that as a result of the microwave diodes 10 being positioned at right angles polarized radiation will be detected whatever the direction of the polarisation relative to the device.
Details of the circuitry will be readily apparent to those skilled in the art and will therefore not be discussed in detail herein.
It will be realized that many variations of the device are possible within the scope of the invention. For example whilst the device described above with reference to Figs. 1 to 3 is suitable for detecting signals in the range of 2-16 Gigahertz a device capable of detecting signals at a frequency as low as 100kHz may be obtained by substituting broad band untuned circuits for the microwave diodes 10.
1. A radio frequency detector having detector means adapated to detect electro-magnetic radiation in any polarisation, 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.
2. A radio frequency detector as claimed in
Claim 1 wherein the detector means includes tw microwave diodes situated at right angles
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. A radio frequency detector having detector means adapated to detect electro-magnetic radiation in any polarisation, 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.
2. A radio frequency detector as claimed in
Claim 1 wherein the detector means includes tw microwave diodes situated at right angles to one another.
3. A radio frequency detector as claimed in
Claim 1 wherein the detector means includes two broad land untuned circuits situated at right angles to one another.
4. A radio frequency detector as claimed in any one of Claims 1 to 3 wherein the warning means includes a bell.
5. A radio frequency detector as claimed in any one of Claims 1 to 4 wherein the warning means includes a light.
6. A radio frequency detector as claimed in any one of Claims 1 to 5 wherein the predetermined level is 10mW/sq.cm.
7. A radio frequency detector substantially as herein described with reference to Figs. 1 to 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08620067A GB2194865A (en) | 1986-08-18 | 1986-08-18 | Radio frequency detector |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08620067A GB2194865A (en) | 1986-08-18 | 1986-08-18 | Radio frequency detector |
| PCT/GB1988/000110 WO1989007768A1 (en) | 1988-02-22 | 1988-02-22 | Radio frequency detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8620067D0 GB8620067D0 (en) | 1986-10-01 |
| GB2194865A true GB2194865A (en) | 1988-03-16 |
Family
ID=26291193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08620067A Withdrawn GB2194865A (en) | 1986-08-18 | 1986-08-18 | Radio frequency detector |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2194865A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2236593A (en) * | 1989-08-25 | 1991-04-10 | Janet Heather Driver | Electromagnetic field detector |
| GB2244560A (en) * | 1990-05-30 | 1991-12-04 | Michael Anthony Butler | Electro-magnetic field strength gauge |
| GB2254440A (en) * | 1991-01-31 | 1992-10-07 | Stanley William Waterman | Detecting microwave radiation |
| EP0600143A1 (en) * | 1991-06-27 | 1994-06-08 | The Narda Microwave Corporation | Electromagnetic radiation monitor |
| US5373284A (en) * | 1993-05-14 | 1994-12-13 | The Narda Microwave Corp. | Personal VHF electromagnetic radiation monitor |
| US5373285A (en) * | 1993-05-14 | 1994-12-13 | The Narda Microwave Corp. | Personal electromagnetic radiation monitor |
| GB2298718A (en) * | 1995-02-21 | 1996-09-11 | Leonard Arthur Driver | Electromagnetic field detector |
| US6154178A (en) * | 1998-12-11 | 2000-11-28 | L3 Communications Corporation | Ultra wideband personal electromagnetic radiation monitor |
| CN103543340A (en) * | 2013-10-08 | 2014-01-29 | 中国科学院城市环境研究所 | Simple electromagnetic environment warning indicator |
| US20190107566A1 (en) * | 2017-10-11 | 2019-04-11 | Rey Dandy Provido Lachica | Systems and methods to facilitate detecting an electromagnetic radiation in a space by using a self-powered radio frequency device (sp-rf device) |
| CN110361603A (en) * | 2019-07-19 | 2019-10-22 | 湘潭大学 | Electromagnetic radiation prediction technique under a kind of equally distributed highway scene of scatterer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB991646A (en) * | 1962-03-02 | 1965-05-12 | Peter Ian Wilkinson | Improvements in or relating to electro magnetic radiation sensing devices |
| GB1166977A (en) * | 1967-06-26 | 1969-10-15 | Atomic Energy Commission | Radio-Frequency Radiation Monitor |
| GB1288750A (en) * | 1968-12-09 | 1972-09-13 | ||
| GB1421365A (en) * | 1973-04-24 | 1976-01-14 | Bowman R R Larsen E B | Antenna arrangements for use with electromagnetic field measuring devices |
| GB1450647A (en) * | 1973-02-16 | 1976-09-22 | France Armed Forces | Warming devices for signalling the presence of electromagnetic radiation |
| GB1523731A (en) * | 1974-08-05 | 1978-09-06 | Commw Scient Ind Res Org | Microwave alarm |
-
1986
- 1986-08-18 GB GB08620067A patent/GB2194865A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB991646A (en) * | 1962-03-02 | 1965-05-12 | Peter Ian Wilkinson | Improvements in or relating to electro magnetic radiation sensing devices |
| GB1166977A (en) * | 1967-06-26 | 1969-10-15 | Atomic Energy Commission | Radio-Frequency Radiation Monitor |
| GB1288750A (en) * | 1968-12-09 | 1972-09-13 | ||
| GB1450647A (en) * | 1973-02-16 | 1976-09-22 | France Armed Forces | Warming devices for signalling the presence of electromagnetic radiation |
| GB1421365A (en) * | 1973-04-24 | 1976-01-14 | Bowman R R Larsen E B | Antenna arrangements for use with electromagnetic field measuring devices |
| GB1523731A (en) * | 1974-08-05 | 1978-09-06 | Commw Scient Ind Res Org | Microwave alarm |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2236593A (en) * | 1989-08-25 | 1991-04-10 | Janet Heather Driver | Electromagnetic field detector |
| GB2236593B (en) * | 1989-08-25 | 1994-01-05 | Janet Heather Driver | Detector |
| GB2244560A (en) * | 1990-05-30 | 1991-12-04 | Michael Anthony Butler | Electro-magnetic field strength gauge |
| GB2254440A (en) * | 1991-01-31 | 1992-10-07 | Stanley William Waterman | Detecting microwave radiation |
| EP0600143A1 (en) * | 1991-06-27 | 1994-06-08 | The Narda Microwave Corporation | Electromagnetic radiation monitor |
| US5373285A (en) * | 1993-05-14 | 1994-12-13 | The Narda Microwave Corp. | Personal electromagnetic radiation monitor |
| US5373284A (en) * | 1993-05-14 | 1994-12-13 | The Narda Microwave Corp. | Personal VHF electromagnetic radiation monitor |
| GB2298718A (en) * | 1995-02-21 | 1996-09-11 | Leonard Arthur Driver | Electromagnetic field detector |
| US6154178A (en) * | 1998-12-11 | 2000-11-28 | L3 Communications Corporation | Ultra wideband personal electromagnetic radiation monitor |
| CN103543340A (en) * | 2013-10-08 | 2014-01-29 | 中国科学院城市环境研究所 | Simple electromagnetic environment warning indicator |
| US20190107566A1 (en) * | 2017-10-11 | 2019-04-11 | Rey Dandy Provido Lachica | Systems and methods to facilitate detecting an electromagnetic radiation in a space by using a self-powered radio frequency device (sp-rf device) |
| US10698015B2 (en) * | 2017-10-11 | 2020-06-30 | Rey Dandy Provido Lachica | Systems and methods to facilitate detecting an electromagnetic radiation in a space by using a self-powered radio frequency device (SP-RF device) |
| CN110361603A (en) * | 2019-07-19 | 2019-10-22 | 湘潭大学 | Electromagnetic radiation prediction technique under a kind of equally distributed highway scene of scatterer |
| CN110361603B (en) * | 2019-07-19 | 2021-06-22 | 湘潭大学 | A prediction method of electromagnetic radiation in highway scene with uniform distribution of scatterers |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8620067D0 (en) | 1986-10-01 |
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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) |