FR2459474A1 - Metal detector in wood and animals - employs parallel amplifier circuit to provide corrective current for balancing - Google Patents
Metal detector in wood and animals - employs parallel amplifier circuit to provide corrective current for balancing Download PDFInfo
- Publication number
- FR2459474A1 FR2459474A1 FR7916813A FR7916813A FR2459474A1 FR 2459474 A1 FR2459474 A1 FR 2459474A1 FR 7916813 A FR7916813 A FR 7916813A FR 7916813 A FR7916813 A FR 7916813A FR 2459474 A1 FR2459474 A1 FR 2459474A1
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- Prior art keywords
- balancing
- animals
- wood
- oscillator
- metal
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- 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
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- 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 Current Or Voltage (AREA)
Abstract
Description
BREVET D'INVENTION
Appareils détecteurs de métaux à dispositif d'équilibrage électronique,pour la recherche dans le bois et le corps des animaux,ou autres applications.PATENT
Metal detecting devices with electronic balancing device, for research in wood and animal bodies, or other applications.
Les détecteurs de métaux existants pour la recherche dans le bois et la chirurgie tetérinaire sont du type T.B.F. à induction nutuelle,l'équilibre du pont d'induction situé dans le disque d'exploration est réalisé avec des selfs spéciales dol tées d'un mécanisme de freinage et de rattrapage de jeu.The existing metal detectors for wood research and teterinary surgery are of the T.B.F. type. with nutual induction, the balance of the induction bridge located in the exploration disc is achieved with special inductors with a braking and backlash mechanism.
Les détecteurs de métaux existants dans le domaine scierie et vétérinaire ou autres présentent plusieurs inconvénients,l'équilibrage du pont d'induction mutuelle nécessite trois selfs de réglages,une à noyau de fer pour le dégrossissage, deux pour les réglages fins dont une à noyau de fer et une à noyau laiton,leurs mécanismes est trés délicat,les différences de température font varier le coefficient d'induction de ces selfs et de ce fait nécessite une retouche fréquente des réglages par l'utilisateur,de plus elles sont inexistantes sur le marché et leurs fabrications est trés onéreuse vu la difficulté de fabrication.Metal detectors existing in the sawmill and veterinary or other fields have several drawbacks, balancing the mutual induction bridge requires three adjustment chokes, one with an iron core for roughing, two for fine adjustments, one of which with a core of iron and one with a brass core, their mechanisms are very delicate, the temperature differences vary the induction coefficient of these inductors and therefore requires frequent retouching of the settings by the user, moreover they are non-existent on the market and their manufacturing is very expensive given the difficulty of manufacturing.
Dans le nouveau systéme employé,l'originalité réside dans le dispositif d'équilibrage électronique du pont d'induction mutuelle,celui-ci emploi deux amplis opérationnels associés avec des résistances,condensateurs et deuxpotentiométres à dix tours de préçisions qui permettent les réglages désirés.In the new system used, the originality lies in the electronic balancing device of the mutual induction bridge, which employs two operational amplifiers associated with resistors, capacitors and two potentiometers with ten precision laps which allow the desired settings.
Les avantages sont les suivants,deux réglages sont seulement nécessaires pour réaliser l'équilibrage du pont d'induction mutuelle,les différences de tempéra- ture n'ont pratiquement aucune influence sur ce dispositif,donc trés peu de retouche sur les réglages ce qui ce traduit par un gain de temps trés appréciable pour l'utilisateur,le temps de fabrication se trouve réduit par rapport aux selfs,prix de revient également réduit,l'ensemble peutse monter sur un circuit imprimé embrochable ce qui facilite l'entretient et le dépannage.The advantages are as follows, two adjustments are only necessary to achieve the balancing of the mutual induction bridge, the differences in temperature have practically no influence on this device, therefore very little retouching on the adjustments which translates into a saving of time very appreciable for the user, the manufacturing time is reduced compared to the chokes, cost price also reduced, the unit can be mounted on a plug-in printed circuit which facilitates maintenance and troubleshooting .
Un inverseur permet la mise en service d'un indicateur lumineux à diodes L.E.D.An inverter allows the commissioning of a L.E.D.
permettant la détection de nuit.allowing night detection.
Le dispositif électronique d'équilibrage se compose de 2 circuits intégrés opérationnels 22 et 23, de 12 résistances 1 à 12 de 2 condensateurs plastique 15 et 16, de 5 condensateurs électrochimiques 17 à 21 et de 2 potentiomètres de préçi sion à 10 tours 13 et 14.The electronic balancing device is made up of 2 operational integrated circuits 22 and 23, 12 resistors 1 to 12, 2 plastic capacitors 15 and 16, 5 electrochemical capacitors 17 to 21 and 2 10-turn precision potentiometers 13 and 14.
Le fonctionnement est le suivant,les inductances L2 et L4 contenues dans le disque d'exploration 25 sont connectées à une source de courant alternatif sinusoi- dal,ce courant est engendré par l'oscillateur 24,l'inductance L3 est connectée à un amplificateur à deux étages accordés dont le courant amplifié est appliqué au Haut-Parleur 27 et aux indicateurs 28 et 29.The operation is as follows, the inductors L2 and L4 contained in the exploration disc 25 are connected to a sinusoidal alternating current source, this current is generated by the oscillator 24, the inductance L3 is connected to an amplifier with two tuned stages whose amplified current is applied to the Speaker 27 and to the indicators 28 and 29.
Les inductances L2 et L sont connectées en série, de sorte que leurs champs magnétiques sont en opposition et leur coefficient d'induction mutuelle relativement à L3 est pratiquement nul.The inductors L2 and L are connected in series, so that their magnetic fields are in opposition and their mutual induction coefficient relative to L3 is practically zero.
Pour obtenir l'équilibre exact du pont d'induction,un signal prélevé sur l'oscillateur 24 est appliqué sur les entrées des C.I. 22 et 23 par l'intermédiaire du diviseur de tension constitué par les résistances 1 et 2 , des condensateurs 15 et 16 , les résistances 3,4,5,6 sont d'égales valeurs,les potentiomètres 13 et 14 étants en butées côté nasse nous avons deux inverseurs de gain unitaire G = - 1 par contresur les autres butées cela devient des non inverseurs de gain unitaire
G = + 1 et à mi course G = O d'ou tension de sortie nulle,grace aux résistances de charge 7 et 8 de valeur différente nous pouvons obtenir à la sortiede ce dispositif un courant de sens et intensité ré glable avec une trés grande préçision, ce courant est fabriqué par 2 amplis opérationnels en paralléles,le retour de l'inductance L3 se faisant sur le point de jonction des résistances 8 et 9 ( 9 étant de trés faible valeur ) il devient aisé en agissant sur les potentiomètres 13 et 14 d'obtenir un équilibre prévis du pont d'induction mutuelle du disque d'exploration,cela se traduit par une stabilité et une sensibilité plus grande des appareils.To obtain the exact balance of the induction bridge, a signal taken from the oscillator 24 is applied to the inputs of the ICs 22 and 23 via the voltage divider constituted by the resistors 1 and 2, the capacitors 15 and 16, the resistors 3,4,5,6 are equal values, the potentiometers 13 and 14 being in stops on the trap side we have two unit gain inverters G = - 1 by cons on the other stops it becomes non-gain inverters unitary
G = +1 and halfway G = O or zero output voltage, thanks to the load resistors 7 and 8 of different value we can get at the output of this device a current of adjustable direction and intensity with a very large precision, this current is produced by 2 operational amplifiers in parallel, the return of the inductor L3 being made on the junction point of the resistors 8 and 9 (9 being very low value) it becomes easy by acting on the potentiometers 13 and 14 to obtain a predicted balance of the mutual induction bridge of the exploration disc, this results in greater stability and sensitivity of the devices.
Un métal dans le champ du disque d'exploration provoque un déséquilibre du pont et induit uncourant dans L3 qui anplifié est dirigé vers les indicateurs. A metal in the field of the exploration disc causes an imbalance of the bridge and induces a current in L3 which, when amplified, is directed towards the indicators.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7916813A FR2459474A1 (en) | 1979-06-19 | 1979-06-19 | Metal detector in wood and animals - employs parallel amplifier circuit to provide corrective current for balancing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7916813A FR2459474A1 (en) | 1979-06-19 | 1979-06-19 | Metal detector in wood and animals - employs parallel amplifier circuit to provide corrective current for balancing |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2459474A1 true FR2459474A1 (en) | 1981-01-09 |
FR2459474B1 FR2459474B1 (en) | 1984-06-01 |
Family
ID=9227262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7916813A Granted FR2459474A1 (en) | 1979-06-19 | 1979-06-19 | Metal detector in wood and animals - employs parallel amplifier circuit to provide corrective current for balancing |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2459474A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2505167A1 (en) * | 1981-05-07 | 1982-11-12 | Mac Cormick Lab Inc | CIRCUIT AND METHOD FOR DETERMINING THE POSITION OF A DEVICE IN A BIOLOGICAL TISSUE |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2575447A (en) * | 1947-10-04 | 1951-11-20 | Rca Corp | Fail-safe feature for balanced bridge indicators |
US2711510A (en) * | 1950-06-21 | 1955-06-21 | Rca Corp | Metal detector balance controls |
US3758849A (en) * | 1972-03-31 | 1973-09-11 | Sperry Rand Corp | Metal detector system having identical balanced field coil system on opposite sides of a detection zone |
-
1979
- 1979-06-19 FR FR7916813A patent/FR2459474A1/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2575447A (en) * | 1947-10-04 | 1951-11-20 | Rca Corp | Fail-safe feature for balanced bridge indicators |
US2711510A (en) * | 1950-06-21 | 1955-06-21 | Rca Corp | Metal detector balance controls |
US3758849A (en) * | 1972-03-31 | 1973-09-11 | Sperry Rand Corp | Metal detector system having identical balanced field coil system on opposite sides of a detection zone |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2505167A1 (en) * | 1981-05-07 | 1982-11-12 | Mac Cormick Lab Inc | CIRCUIT AND METHOD FOR DETERMINING THE POSITION OF A DEVICE IN A BIOLOGICAL TISSUE |
Also Published As
Publication number | Publication date |
---|---|
FR2459474B1 (en) | 1984-06-01 |
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Legal Events
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TP | Transmission of property | ||
ST | Notification of lapse |