GB1448487A - Detecting presence or absence of metal - Google Patents
Detecting presence or absence of metalInfo
- Publication number
- GB1448487A GB1448487A GB5352773A GB5352773A GB1448487A GB 1448487 A GB1448487 A GB 1448487A GB 5352773 A GB5352773 A GB 5352773A GB 5352773 A GB5352773 A GB 5352773A GB 1448487 A GB1448487 A GB 1448487A
- Authority
- GB
- United Kingdom
- Prior art keywords
- absence
- metal
- detecting presence
- detecting
- 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
- 239000002184 metal Substances 0.000 title 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
- H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
- H03G3/3015—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/20—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature
- G01D5/2006—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils
- G01D5/202—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying inductance, e.g. by a movable armature by influencing the self-induction of one or more coils by movable a non-ferromagnetic conductive element
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
-
- 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
- G01V3/101—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 by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil
- G01V3/102—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 by measuring the impedance of the search coil; by measuring features of a resonant circuit comprising the search coil by measuring amplitude
Landscapes
- Physics & Mathematics (AREA)
- General 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)
- Geophysics (AREA)
- Multimedia (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7241570A FR2250424A5 (en) | 1972-11-17 | 1972-11-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1448487A true GB1448487A (en) | 1976-09-08 |
Family
ID=9107550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5352773A Expired GB1448487A (en) | 1972-11-17 | 1973-11-19 | Detecting presence or absence of metal |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2357381A1 (en) |
FR (1) | FR2250424A5 (en) |
GB (1) | GB1448487A (en) |
IT (1) | IT998746B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2000293A (en) * | 1977-06-10 | 1979-01-04 | Vdo Schindling | Device for displaying fluctuations in the speed of a boat |
US4237517A (en) * | 1978-04-28 | 1980-12-02 | Ludlow Industries, Inc. | Motion monitoring apparatus |
US5459405A (en) * | 1991-05-22 | 1995-10-17 | Wolff Controls Corp. | Method and apparatus for sensing proximity of an object using near-field effects |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2531517A1 (en) * | 1975-07-15 | 1977-02-03 | Bosch Gmbh Robert | DEVICE FOR DETECTING A MARK ON A ROTATING BODY |
US5670886A (en) * | 1991-05-22 | 1997-09-23 | Wolf Controls Corporation | Method and apparatus for sensing proximity or position of an object using near-field effects |
-
1972
- 1972-11-17 FR FR7241570A patent/FR2250424A5/fr not_active Expired
-
1973
- 1973-10-15 IT IT3013873A patent/IT998746B/en active
- 1973-11-16 DE DE19732357381 patent/DE2357381A1/en not_active Withdrawn
- 1973-11-19 GB GB5352773A patent/GB1448487A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2000293A (en) * | 1977-06-10 | 1979-01-04 | Vdo Schindling | Device for displaying fluctuations in the speed of a boat |
GB2000293B (en) * | 1977-06-10 | 1982-04-28 | Vdo Schindling | Device for displaying fluctuations in the speed of a boat |
US4237517A (en) * | 1978-04-28 | 1980-12-02 | Ludlow Industries, Inc. | Motion monitoring apparatus |
US5459405A (en) * | 1991-05-22 | 1995-10-17 | Wolff Controls Corp. | Method and apparatus for sensing proximity of an object using near-field effects |
US5633593A (en) * | 1991-05-22 | 1997-05-27 | Wolff; George D. | Apparatus for sensing proximity of a moving target |
Also Published As
Publication number | Publication date |
---|---|
DE2357381A1 (en) | 1974-05-22 |
FR2250424A5 (en) | 1975-05-30 |
IT998746B (en) | 1976-02-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |