Patent Application
20160153829
Definition of Vibration:
Based on mechanic,
Following by this above short description is to find into the literature about vibration sensors different types of sensors are acting by optic, acoustic, common electric, piezoelectric and other signals which are created by nature and/or artificially by human.
Human vibration sensors are e.g. eyes, ears, fingertips and skin named “haptik” as human fine perceptual.
In this paper only the group of inductive sensors are involved e.g. operate by induction or acting like a differential transformer and/or perform inductive displacement transducer or distance sensor.
Patents about these vibration sensors are e.g. described in class 73, 517R and class 73, 654 R.
Patents describing the different vibration sensors are e.g. WO 2013029286 (A1) Entitled “Inertial measurement unit of unmanned aircraft”, patent document US 2013025346 (A1) entitled “Long-period vibration sensor and method for correcting output value of the long-period vibration sensor”, patent document WO2013007071 (A1) entitled “Sensor for probing geological disaster and monitoring and alarming device thereof”, patent document EP 2546185 (A1) entitled “Vibration absorber”, patent document HY131771 (A1) entitled “Multi-input, multi-output motion control for lithography system”, patent document EP2543619 (A1) entitled “Vibration damper system”, patent document US2013002244 (A1) entitled “Mems-based magnetic sensor with a lorentz force actuator used as force feedback”, US 2012319866(A1) entitled “Wireless sensor device and method for wirelessly communicating a sensed physical parameter”, Patent document US2012313784 (A1) entitled “Portable reverse alarm system”, patent document US2012287757 entitled “Forward looking seismics from drill-bit”, patent document RU2465557 (C1) entitled “Electromagnetic device, as well as vibration type sensor with said electromagnetic device”, patent document WO2012156507 (A2) entitled “System for making available information which represents a vibration state for the operation of vibration-emitting machines, in particular construction machines”. Prior art are further described in U.S. Pat. No. 2,852,243, U.S. Pat. No. 3,100,292, U.S. Pat. No. 3,129,347, U.S. Pat. No. 3,308,647 and U.S. Pat. No. 3,483,759.
All of this above patents are based mostly of the Lenz law, based originally on Faraday's law of induction and also Lorentz force.
In the above patents inductive effects are created by extraneous/outside vibrations affecting the movable permanent centre magnet and recorded by surrounded coils or inverse movable centre coil and surrounded permanent magnet.
Mostly—as will be find in this literature—one permanent magnet affects a surrounding coil.
Into this coil the “extraneous” movement of the permanent magnet create induction, which can be registered and recorded.
Inverted, the same applies for moving coil.
All kind of vibration sensors, that are available at the market, are made according this construction and design. By measurements and field trials the result are only low signals and also not specific spectrums—as a fingerprint for persons, vehicles or any traffic, or to create different fingerprints to detect intrusion into different objects.
Usually one permanent centre magnet is fixed on the top and/or bottom in this direction that the polarity is south to south movable magnet to fixed magnet and/or also the other side north to north.
By this arrangement the movable magnet is hold by repelling effect free to move but softly dumped.
This repelling effect create, that any kind of vibrations can be recorded only soft muted and also the “extraneous” movements of the centre magnet can create only “muffled” induction into the coil(s).
For better sensibility was found out by this invention that this above repelling/damped effect not created the expected sensibility.
So an other way was invented in this kind, that the fixed magnet on the top was not in repelling direction—as described before—but in attraction direction in this wise, that the moveable part is to the bottom hold by the fixed magnet in repelling direction and the fixed magnet on the top in attraction direction.
It was found out , that the distance between the top fixed attraction magnet to the moveable part (magnets) must be so adjusted, that the moveable part (magnets) is not lifting to the top.
By this adjustment the sensibility is optimized.
The “normal” effects detected by a lot of measurements and field tests with commercial sensors—as described in the patents listed above and found into the actual market—have indicated the idea for the following invention of a better and much more thin-skinned, telling and recording vibration sensor collecting more and better signals from the surroundings.
The invention therefore relates to an improved vibration sensor as follows:
The invention relates to an improved vibration sensor for registration of vibrations vertically and horizontally where a movable part, comprising at least one magnet, is movably arranged in a holder, where the holder comprises a in the upper part of the holder arranged magnet and a in the bottom part of the holder arranged magnet where the movable part is freely movable between the in the upper part of the holder arranged magnet and the in the bottom part of the holder arranged magnet, further the movable part is enclosed/environed by at least one coil in which the movable part, completely or partially, is freely movable.
The improved vibration sensor is further characterized by;
the magnets in the movable part being arranged to repel the in the bottom part of the holder arranged magnet and where the magnets in the moveable part are arranged to attract the in the upper part arranged magnet.
the moveable part being arranged so that the movable part is in equilibrium/balance between the upper part of the holder arranged magnet and the in the bottom part of the holder arranged magnet.
the movable part being arranged in a tube with a around the movable part surrounding air gap between the movable part and the tube.
the tube is arranged with at least one slot.
the number of coils are more than the number of magnets, where the magnets are arranged in the movable part and where the coils are separated by spacer rings between the coils.
an evaluation unit, a transmitter and receiver and a battery being arranged in the vibration sensor, where the transmitter and receiver are arranged for communication with other vibration sensors and where the battery provides the evaluation unit and the transmitter and receiver with electric energy.
the vibration sensor being arranged with a transformer coupling of a first coil and a second coil where the coils are electric arranged to the first coil and where the first coil is inductively connected to the second coil and where the second coil inductively transmits signals to the evaluation unit and transmitter and receiver.
The invention is described as follow. See drawings A+B+C in
Agenda
The goal for the work was therefore to find e.g. a better way and design to become e.g. signals from longer distances, spectrums for specific objects and also the possibility to build in GPS—systems as a part of the evaluation unit 11, and/or to locate the suspicious and/or unknown vibrations.
The first area to promote better signals was to see in which way—by the background how an induction signal was generated—the sensor can be made by any other, better or more sophisticated design.
In a lot of field trials it was found—and that was not preliminary expected—that more permanent magnets 7 and also relevant numbers of high numbered winding coils 6 bring more powerful induction signals and in combination, that the permanent magnets 7 where coupled to pairs in such form, like in part 9, that the resulting magnetic fields was compressed between the same polarities in a defined air gaps 10 to create higher induction in the relevant coils 6.
It was also found in these trials—what was not in knowledge before—, that the distance, of air gap 10, and the polarities of the permanent magnets 7 in part 9 were both important for the quality and quantity of the signals.
After more trials was a additional effect found—it was also not expected too—that the outer tube 4 through his special design produced a greater induction in part 6 due to the better mobility and larger amplitude of part 9, due to smaller damping of the metal tube 4.
The combination repelling magnet 5B and very exactly adjusted attraction magnet 5T has given the best sensibility and the best damping by external influences so that different vibrations are better indicated, determinated and indentified regarding what/who caused the interference/vibration.
Also, the combination of coils spaced apart by spacers 8, and located opposite the air gaps 10, has more than double the induction by more coils 6 and permanent magnets 7.
The connecting in series of the coils 6 together with the powerful magnetic influence coming from the air gap 10 areas, ensured that the sensibility became much better than the constructions and designs available on the market or described in the literature.
It was also found without expectation, that not only vertical vibrations where indicated, to surprise also horizontal vibrations where indicated many times better then from every other vibration induction sensors from the market.
Based on these unexpected but real results the following claims are for the vibration sensor:
| Number | Date | Country | Kind |
|---|---|---|---|
| 1300442-9 | Jun 2013 | SE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/SE2014/000086 | 6/19/2014 | WO | 00 |
