GB1209985A - Improvements in or relating to vehicle detector circuit arrangements - Google Patents
Improvements in or relating to vehicle detector circuit arrangementsInfo
- Publication number
- GB1209985A GB1209985A GB4525868A GB4525868A GB1209985A GB 1209985 A GB1209985 A GB 1209985A GB 4525868 A GB4525868 A GB 4525868A GB 4525868 A GB4525868 A GB 4525868A GB 1209985 A GB1209985 A GB 1209985A
- Authority
- GB
- United Kingdom
- Prior art keywords
- loop
- vehicle detector
- circuit
- relating
- detector circuit
- 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
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2611—Measuring inductance
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Traffic Control Systems (AREA)
Abstract
1,209,985. Road vehicle detectors. SIEMENS A.G. 24 Sept., 1968 [25 Sept., 1967], No. 45258/68. Heading G4Q. An inductive-loop vehicle detector comprises a phase comparator 12, 13 to one input of which is applied a voltage signal that is produced across an impedance formed by a series combination of an untuned loop 5 a resistor 6 and a resonant circuit 7, 8, 9; and to the other input of which the voltage across the circuit 7, 8, 9 only is applied. The resistor 6 preferably has a resistance equal to the reactance of the loop, and the circuit 7, 8, 9 may be de-tuned to adjust the comparator output signal level. When a vehicle passes over the loop, the resulting phase shift results in an output signal at 17.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES0111988 | 1967-09-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1209985A true GB1209985A (en) | 1970-10-28 |
Family
ID=7531364
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4525868A Expired GB1209985A (en) | 1967-09-25 | 1968-09-24 | Improvements in or relating to vehicle detector circuit arrangements |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH481439A (en) |
GB (1) | GB1209985A (en) |
NL (1) | NL151797B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3685013A (en) * | 1970-08-14 | 1972-08-15 | Joseph L Brickner | Self-adjusting vehicle detector system |
US4296401A (en) * | 1977-01-11 | 1981-10-20 | Redland Automation Limited | Inductive vehicle detector |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2817670C2 (en) * | 1978-04-19 | 1986-04-17 | Elmeg Elektro-Mechanik Gmbh, 3150 Peine | Induction loop detector for traffic counting devices |
EP0106843A4 (en) * | 1982-04-16 | 1984-07-04 | Herman Lanier Watson | Imrpoved inductance to frequency converter circuit. |
-
1968
- 1968-09-23 CH CH1420768A patent/CH481439A/en not_active IP Right Cessation
- 1968-09-24 GB GB4525868A patent/GB1209985A/en not_active Expired
- 1968-09-24 NL NL6813629A patent/NL151797B/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3685013A (en) * | 1970-08-14 | 1972-08-15 | Joseph L Brickner | Self-adjusting vehicle detector system |
US4296401A (en) * | 1977-01-11 | 1981-10-20 | Redland Automation Limited | Inductive vehicle detector |
Also Published As
Publication number | Publication date |
---|---|
CH481439A (en) | 1969-11-15 |
NL6813629A (en) | 1969-03-27 |
NL151797B (en) | 1976-12-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |