GB860197A - Improvements in or relating to apparatus for detecting ferromagnetic and electrically - Google Patents
Improvements in or relating to apparatus for detecting ferromagnetic and electricallyInfo
- Publication number
- GB860197A GB860197A GB1703157A GB1703157A GB860197A GB 860197 A GB860197 A GB 860197A GB 1703157 A GB1703157 A GB 1703157A GB 1703157 A GB1703157 A GB 1703157A GB 860197 A GB860197 A GB 860197A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- input
- oscillator
- frequency
- 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
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
- G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
- G01V3/105—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops
- G01V3/107—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops using compensating coil or loop arrangements
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
860,197. Electric tests. RANK CINTEL Ltd. May 29, 1958 [May 29, 1957], No. 17031/57. Drawings to Specification. Class 37. In known systems for detecting magnetic or electrically conductive bodies, the coupling between coils connected to an amplifier input and output respectively is varied by the presence of the body so that the circuit oscillates. In order to distinguish between different bodies which cause the circuit to oscillate at frequencies which differ only slightly, the oscillator output is caused to beat with the output from a separate oscillator, the frequency of which is of the same order so that the difference frequency which may be in the audible range enables objects to be distinguished. Earphones may be used and a filter circuit may be connected between the mixer output and the indicator device or between the oscillator output and the mixer to assist in separating a desired signal. The input coil is shunted by a tuning condenser and the output coil may be shunted also so that it is resonant at the same frequency as the input.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1703157A GB860197A (en) | 1957-05-29 | 1957-05-29 | Improvements in or relating to apparatus for detecting ferromagnetic and electrically |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1703157A GB860197A (en) | 1957-05-29 | 1957-05-29 | Improvements in or relating to apparatus for detecting ferromagnetic and electrically |
Publications (1)
Publication Number | Publication Date |
---|---|
GB860197A true GB860197A (en) | 1961-02-01 |
Family
ID=10087982
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1703157A Expired GB860197A (en) | 1957-05-29 | 1957-05-29 | Improvements in or relating to apparatus for detecting ferromagnetic and electrically |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB860197A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3719882A (en) * | 1970-11-12 | 1973-03-06 | A Pincus | Resonant circuit apparatus for detecting electromagnetic conductive bodies |
-
1957
- 1957-05-29 GB GB1703157A patent/GB860197A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3719882A (en) * | 1970-11-12 | 1973-03-06 | A Pincus | Resonant circuit apparatus for detecting electromagnetic conductive bodies |
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