GB1166977A - Radio-Frequency Radiation Monitor - Google Patents
Radio-Frequency Radiation MonitorInfo
- Publication number
- GB1166977A GB1166977A GB2401668A GB2401668A GB1166977A GB 1166977 A GB1166977 A GB 1166977A GB 2401668 A GB2401668 A GB 2401668A GB 2401668 A GB2401668 A GB 2401668A GB 1166977 A GB1166977 A GB 1166977A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chirp
- signal
- unijunction
- waveguides
- fields
- 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
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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Ultra Sonic Daignosis Equipment (AREA)
- Emergency Alarm Devices (AREA)
Abstract
1,166,977. Detecting RF fields; locating leaks in waveguides. UNITED STATES ATOMIC ENERGY COMMISSION. May 20, 1968 [June 26, 1967], No. 24016/68. Heading G1U. [Also in Divisions G4, H3 and H4] A circuit for producing a chirp note when an RF field is present comprises a coil L tuned by CI to the RF field, e.g. 200 MHz, (continuous or pulsed) the picked-up signal being rectified by DI to change C2. At a predetermined level depending on the setting of P the unijunction Q1 will fire and apply pulses to transistor Q2 at a frequency depending on the RF level. At each pulse capacitor C4 changes and turns on Q3, the time constant of C4 and R2 determining the duration of the chirp. When Q3 conducts, capacitor C5 alternately changes through R3 and discharges through a second unijunction Q4 to produce a chirp A. F. signal at a frequency depending on R3. This signal is amplified and fed to a Piezo-electric or other loudspeaker S. Diodes D2 and D3 prevent the associated transistors from being cut off by large signals. The circuit may be used as a personnel monitor for dangerous R. F. fields or for locating leaks in waveguides or cooling lines.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US64944067A | 1967-06-26 | 1967-06-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1166977A true GB1166977A (en) | 1969-10-15 |
Family
ID=24604795
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2401668A Expired GB1166977A (en) | 1967-06-26 | 1968-05-20 | Radio-Frequency Radiation Monitor |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE717035A (en) |
DE (1) | DE1766623A1 (en) |
ES (1) | ES354806A1 (en) |
FR (1) | FR1569459A (en) |
GB (1) | GB1166977A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160004A (en) * | 1984-03-15 | 1985-12-11 | Patrick Joseph Lally | Improvements relating to audible warning devices |
GB2194865A (en) * | 1986-08-18 | 1988-03-16 | Secr Defence | Radio frequency detector |
GB2236593A (en) * | 1989-08-25 | 1991-04-10 | Janet Heather Driver | Electromagnetic field detector |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56143960A (en) * | 1980-04-10 | 1981-11-10 | Hajime Sangyo Kk | Noise detector |
-
1968
- 1968-05-20 GB GB2401668A patent/GB1166977A/en not_active Expired
- 1968-06-07 ES ES354806A patent/ES354806A1/en not_active Expired
- 1968-06-24 BE BE717035D patent/BE717035A/xx unknown
- 1968-06-24 FR FR1569459D patent/FR1569459A/fr not_active Expired
- 1968-06-25 DE DE19681766623 patent/DE1766623A1/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160004A (en) * | 1984-03-15 | 1985-12-11 | Patrick Joseph Lally | Improvements relating to audible warning devices |
GB2194865A (en) * | 1986-08-18 | 1988-03-16 | Secr Defence | Radio frequency detector |
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 |
Also Published As
Publication number | Publication date |
---|---|
ES354806A1 (en) | 1970-11-16 |
FR1569459A (en) | 1969-05-30 |
DE1766623A1 (en) | 1971-08-12 |
BE717035A (en) | 1968-12-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
PLNP | Patent lapsed through nonpayment of renewal fees |