CN109031861B - Laser projector, and magnet polarity detection method and system - Google Patents
Laser projector, and magnet polarity detection method and system Download PDFInfo
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- CN109031861B CN109031861B CN201810865518.XA CN201810865518A CN109031861B CN 109031861 B CN109031861 B CN 109031861B CN 201810865518 A CN201810865518 A CN 201810865518A CN 109031861 B CN109031861 B CN 109031861B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
Abstract
The embodiment of the application provides a laser projector, and a magnet polarity detection method and system. The laser projector comprises a magnet, a coil assembly and a flexible arm, wherein one end of the flexible arm is fixed, the other end of the flexible arm is connected with the coil assembly, and the coil assembly extends into a magnetic field space formed between two poles of the magnet through the flexible arm and is suspended in the magnetic field space; a position information feedback circuit is arranged on the flexible arm; the coil assembly is electrified and then drives the flexible arm to twist and deform under the action of a magnetic field, and the position information feedback circuit is used for detecting the twisting deformation of the flexible arm and outputting voltage signals with opposite directions to the upper computer according to different twisting directions of the flexible arm so that the upper computer can determine the installation state of the magnet according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet. The laser projector of the embodiment of the application can accurately detect whether the magnet is reversely installed.
Description
Technical Field
The application relates to the technical field of laser projection, in particular to a laser projector, and a magnet polarity detection method and system.
Background
The internal execution mechanism of the laser projection comprises a coil, an MEMS (micro-electromechanical system) galvanometer (scanning galvanometer), a magnet and other components, wherein the coil and the MEMS galvanometer are fixed on the support, a magnetic field environment is formed between two poles of the magnet, the coil and the MEMS galvanometer on the support are suspended in the magnetic field environment, and after the coil is electrified, the scanning galvanometer is driven to rotate to a certain angle and then starts projection work.
If the polarity of the magnet is installed reversely, the projection of the scanning galvanometer will be wrong, however, at present, there is no method and device for effectively and rapidly detecting whether the polarity of the magnet is installed reversely.
Disclosure of Invention
Aspects of the application provide a laser projector, a magnet polarity detection method and a magnet polarity detection system, which are used for effectively and rapidly detecting whether the magnet polarity is reversely installed.
The embodiment of the present application provides a laser projector, includes: the coil assembly extends into a magnetic field space formed between two poles of the magnet 5 through the flexible arm 6 and is suspended in the magnetic field space;
a position information feedback circuit is arranged on the flexible arm 6; the coil assembly is electrified and then drives the flexible arm 6 to be twisted and deformed under the action of a magnetic field, the position information feedback circuit is used for detecting the twisting deformation of the flexible arm 6 and outputting voltage signals with opposite directions to the upper computer according to different twisting directions of the flexible arm 6, so that the upper computer can determine the installation state of the magnet 5 according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet.
Further, the position information feedback circuit includes: and the pressure sensitive element is subjected to different external pressures according to different torsion directions of the flexible arm 6, and the resistance value of the pressure sensitive element is changed differently, so that the two output ends output a positive voltage signal or a negative voltage signal.
Further, the position information feedback circuit further includes: the coil is connected with the first input end, the second input end, the first output end and the second output end, the pressure sensitive element is connected between the first input end, the second input end and the first output end or between the first input end, the second input end and the second output end before the coil is not electrified, and the voltage between the first output end and the second output end is zero; after the coil is electrified, the resistance value of the pressure sensitive element is increased or decreased according to different torsion directions of the flexible arm 6, and a negative voltage signal or a positive voltage signal is generated between the first output end and the second output end.
Further, the pressure sensitive element is a piezoresistor Rt.
Further, the position information feedback circuit further includes: a resistor R1, a resistor R2 and a resistor R3;
the resistor R1, the resistor R2, the resistor R3 and the piezoresistor Rt are connected in series, one group of opposite series points in the four series points form two input ends, and the other group of opposite series points form two output ends; the two input ends are used for connecting an external power supply, and the two output ends are used for outputting voltage signals; before the coil is not electrified, the voltage between the two output ends is zero; after the coil is electrified, the resistance value of the piezoresistor is increased or decreased according to different twisting directions of the flexible arm 6, so that a negative voltage signal or a positive voltage signal is generated between the two output ends.
Furthermore, the flexible arm is arranged on the support 2, the galvanometer 4 is arranged in the coil 3 in an inserting mode, and the other end of the flexible arm 6 is connected with the support 2.
Further, the galvanometer 4 is mounted on the bracket 2 through a horizontal flexible arm 7.
The application provides a magnet polarity detection system, includes: the system comprises a laser projector, a data acquisition unit and an upper computer;
the laser projector comprises a magnet 5, a coil assembly and a flexible arm 6, wherein one end of the flexible arm 6 is fixed, the other end of the flexible arm 6 is connected with the coil assembly, and the coil assembly extends into a magnetic field space formed between two poles of the magnet 5 through the flexible arm 6 and is suspended in the magnetic field space; a position information feedback circuit is arranged on the flexible arm 6; the coil assembly is electrified and then drives the flexible arm 6 to be twisted and deformed under the action of a magnetic field, and the position information feedback circuit is used for detecting the twisting deformation of the flexible arm 6 and outputting voltage signals with opposite directions to an upper computer according to different twisting directions of the flexible arm 6;
the data acquisition unit is used for acquiring the voltage signal and sending the voltage signal to an upper computer;
and the upper computer determines the installation state of the magnet 5 according to the preset corresponding relation between the voltage signal direction and the installation state of the magnet and the voltage signal output by the position information feedback circuit.
Further, still include: the power supply module, power supply module's input and host computer are connected, and power supply module's output is connected with coil pack and position information feedback circuit's first input and second input, and host computer control power supply module is the power supply of coil pack and position information feedback circuit.
The embodiment of the present application further provides a method for detecting a polarity of a magnet, including:
energizing a coil assembly in the laser projector, wherein the coil assembly extends into a magnetic field space formed between two poles of the magnet through the flexible arm and is suspended in the magnetic field space;
the position information feedback circuit arranged on the flexible arm 6 detects the torsional deformation of the coil assembly driven by the flexible arm 6 under the action of a magnetic field, and outputs voltage signals with opposite directions according to different torsional directions of the flexible arm 6;
and the upper computer determines the installation state of the magnet 5 according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet and the voltage signal output by the position information feedback circuit.
According to the laser projector provided by the embodiment of the application, the coil assembly deflects under the action of a magnetic field after being electrified, and the deflection direction is related to the installation state of the magnet polarity, and the flexible arm for fixing the coil assembly is provided with the position information feedback circuit; the coil assembly is driven by the action of a magnetic field to twist and deform the flexible arm after being electrified, the position information feedback circuit outputs voltage signals with opposite directions to the upper computer according to different twisting directions of the flexible arm, and the upper computer determines the installation state of the magnet according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a magnet polarity detection system according to an exemplary embodiment of the present application;
FIG. 2 is a schematic structural diagram of a laser projector according to an exemplary embodiment of the present application;
FIG. 3 is a partial block diagram of a laser projector according to an exemplary embodiment of the present application;
FIG. 4 is a circuit diagram of a position information feedback circuit according to an exemplary embodiment of the present application;
FIG. 5 is a circuit diagram of a position information feedback circuit according to yet another exemplary embodiment of the present application;
FIG. 6 is a flow chart of a magnet polarity detection method according to an exemplary embodiment of the present application;
fig. 7 is a schematic structural diagram of a host computer according to an exemplary embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Aiming at the problem that a method and equipment for effectively and rapidly detecting whether the polarity of a magnet is reversed do not exist in the prior art, the embodiment of the application provides a solution scheme, and the basic idea is as follows: according to the embodiment of the application, the coil assembly deflects under the action of a magnetic field after being electrified, and the deflection direction is related to the installation state of the magnet polarity, a position information feedback circuit is arranged on the flexible arm for fixing the coil assembly; the coil assembly is driven by the action of a magnetic field to twist and deform the flexible arm after being electrified, the position information feedback circuit outputs voltage signals with opposite directions to the upper computer according to different twisting directions of the flexible arm, and the upper computer determines the installation state of the magnet according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram illustrating an overall architecture of a magnet polarity detection system according to an exemplary embodiment of the present application. As shown in fig. 1, the magnet polarity detection system includes: laser projector, data acquisition ware and host computer.
In this embodiment, the upper computer refers to a computer device having functions of computing, accessing internet, communicating, and the like, and the implementation form thereof may be various, for example, the upper computer may be a smart phone, a personal computer, a wearable device, a tablet computer, and the like.
In this embodiment, the data acquisition device is a device capable of acquiring a voltage signal output by the laser projector, the data acquisition device has an analog-to-digital conversion function, and can convert an acquired voltage analog signal into a digital voltage signal and upload the digital voltage signal to an upper computer for analysis and processing, and the implementation form of the data acquisition device can be various, such as a data acquisition card, a palm computer, and the like.
The data collector and the laser projector can be in wireless or wired connection. For example, the data acquisition unit is provided with a corresponding signal output interface, and the laser projector is provided with a signal input interface, which are interconnected through data transmission lines such as a USB line. Or, inside wireless communication modules that are equipped with the adaptation of data collection station and laser projector, for example bluetooth module, WIFI module, network card etc. then data collection station and laser projector can realize wireless connection through wireless communication module.
The data collector and the upper computer can be in wireless or wired connection. For example, the data acquisition unit is provided with a corresponding signal output interface, and the upper computer is provided with a signal input interface which are interconnected through data transmission lines such as a USB line. Or, the data collection station and the upper computer are internally provided with adaptive wireless communication modules, such as a bluetooth module, a WIFI module, a network card and the like, and the data collection station and the upper computer can be wirelessly connected through the wireless communication modules.
Further, magnet polarity judgement system of this application embodiment still includes power module, and power module's input and host computer are connected, and power module's output and coil pack and the inside position information feedback circuit's of laser projector first input and second input are connected, and host computer control power module is the power supply of coil pack and position information feedback circuit. The power supply module provides a working power supply for the position information feedback circuit.
Fig. 2 is a schematic structural diagram of a laser projector according to an exemplary embodiment of the present application. The laser projector comprises a magnet 5, a coil assembly and a flexible arm 6, wherein one end of the flexible arm 6 is fixed, the other end of the flexible arm 6 is connected with the coil assembly, the coil assembly extends into a magnetic field space formed between two poles of the magnet 5 through the flexible arm 6 and is suspended in the magnetic field space, and a position information feedback circuit is arranged on the flexible arm 6; the coil assembly is electrified and then driven by the action of a magnetic field to drive the flexible arm 6 to be twisted and deformed, and the position information feedback circuit is used for detecting the twisting deformation of the flexible arm 6 and outputting voltage signals with opposite directions to an upper computer according to different twisting directions of the flexible arm 6.
In the laser projector of the embodiment, the coil assembly deflects under the action of a magnetic field after being electrified, and a position information feedback circuit is arranged on the flexible arm for fixing the coil assembly, wherein the deflection direction is related to the installation state of the magnet polarity; the coil assembly is electrified and then driven by the action of a magnetic field to drive the flexible arm to be twisted and deformed, the position information feedback circuit outputs voltage signals with opposite directions to the upper computer according to different twisting directions of the flexible arm, so that the upper computer can determine the installation state of the magnet according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet, and the laser projector can accurately detect whether the magnet is reversely installed.
As shown in fig. 2 and 3, the laser projector of the embodiment of the present application further includes a galvanometer 4, the coil assembly includes a support 2 and a coil 3 installed on the support 2, the coil 3 is powered by a power module, the galvanometer 4 is installed on the support 2 and the galvanometer 4 is inserted into the coil 3, and the other end of the flexible arm 6 is connected to the support 2. The galvanometer 4 is mounted on the bracket 2 through a horizontal flexible arm 7. In an alternative embodiment, the bracket for fixing the coil 3 is an oval, the coil 3 is fixed to the bracket 2 in a spiral shape, the scanning galvanometer 4 is installed on the bracket 2 through a horizontal flexible arm, and the scanning galvanometer 4 is installed in the middle of the coil 3 in an inserting manner, that is, the coil 3 surrounds the scanning galvanometer 4, the upper end and the lower end of the bracket 2 are respectively fixed through a flexible arm 6, the above description of the structure and the position relationship of the components is only an exemplary description, and the structure and the position relationship of the components are not limited to the above embodiments, for example: the shape of the holder 2 may be other shapes, the flexible arms 6 may be provided at only one end of the holder 2, etc.
In an alternative embodiment, the position information feedback circuit internally includes a pressure sensing element, and the pressure sensing element is subjected to different external pressures according to different torsion directions of the flexible arm 6, and the resistance value of the pressure sensing element changes differently, so that the two output terminals output a positive voltage signal or a negative voltage signal. It should be noted that, in the embodiment of the present application, the resistance value of the pressure sensing element has a positive correlation with the external pressure, when the resistance value of the pressure sensing element is increased by the external pressure, the resistance value of the pressure sensing element is also increased correspondingly, and when the resistance value of the pressure sensing element is decreased by the external pressure, the resistance value of the pressure sensing element is also decreased correspondingly.
In the above embodiment, the position information feedback circuit further includes: the coil is connected with the first input end, the second input end, the first output end and the second output end, the pressure sensitive element is connected between the first input end, the second input end and the first output end or between the first input end, the second input end and the second output end before the coil is not electrified, and the voltage between the first output end and the second output end is zero; after the coil is electrified, the resistance value of the pressure sensitive element is increased or decreased according to different torsion directions of the flexible arm 6, and a negative voltage signal or a positive voltage signal is generated between the first output end and the second output end.
It should be noted that, the increase or decrease of the resistance of the pressure sensitive element according to the different twisting directions of the flexible arm 6 is related to the installation relationship between the pressure sensitive element and the flexible arm 6. An optional embodiment of the installation relationship between the pressure sensitive element and the flexible arm 6 is that after the pressure sensitive element is installed in the flexible arm 6, because one end of the flexible arm 6 is fixed, the flexible arm 6 is twisted when the flexible arm 6 is rotated, so that the pressure sensitive element bears certain pressure, and after the coil assembly is electrified, if the flexible arm 6 continues to rotate in the direction of the rotation of the flexible arm 6 when the flexible arm 6 is installed, the pressure of the flexible arm 6 on the pressure sensitive element is gradually increased; conversely, when the coil assembly is energized, the flexible arm 6 rotates in a direction opposite to the direction in which the flexible arm 6 rotates during installation, the flexible arm 6 returns to the twisted state, and the pressure of the flexible arm 6 on the pressure-sensitive element gradually decreases. Optionally, the pressure sensitive element in the embodiment of the present application is a piezoresistor Rt or a piezoresistor sensor.
Fig. 4 shows a simplified embodiment of a position information feedback circuit according to an embodiment of the present application. The position information feedback circuit includes: a piezoresistor Rt, a resistor R1, a resistor R2 and a resistor R3; the resistor R1, the resistor R2, the resistor R3 and the piezoresistor Rt are connected in series, one group of opposite series points in the four series points form two input ends, and the other group of opposite series points form two output ends; the two input ends are used for connecting an external power supply, and the two output ends are used for outputting voltage signals; before the coil is not electrified, the voltage between the two output ends is zero; after the coil is electrified, the resistance value of the piezoresistor is increased or decreased according to different twisting directions of the flexible arm 6, so that a negative voltage signal or a positive voltage signal is generated between the two output ends. The circuit structure of the information feedback circuit is simple, and the cost is low.
The operation principle of the laser projector according to the embodiment of the present application will be described with reference to the position information feedback circuit according to the exemplary embodiment of fig. 5.
The exemplary embodiment of fig. 5 provides a position information feedback circuit as a bridge configuration circuit. The circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a piezoresistor Rt. The position information feedback circuit comprises two input ends (a1, a2) and two output ends (a3, a4), a resistor R1 is connected between an input end a1 and an output end a3, a resistor R2 and a piezoresistor Rt which are connected in series are connected between an input end a2 and an output end a3, a resistor R3 is connected between an input end a1 and an output end a4, a resistor R4 is connected between an input end a2 and an output end a4, the output voltage between the two output ends (a3, a4) is Uo, and the input voltage between the two input ends (a1, a2) is Ui.
and a, when the coil is not in a non-energized state, the position information feedback circuit is in a balanced state.
The resistance values of the resistors need to meet the conditions: r2 ═ R3 ═ R4 ═ R1+ Rt,
Uo＝R2*Ui/(R1+R2+Rt)-R4*Ui/(R3+R4)＝0；
b, when the polarities of the magnets are arranged according to the preset positions, when the coil is electrified, the current direction is shown as a dotted line in FIG. 2: half coil current direction on the left side from top to bottom, half coil current direction on the right side from bottom to top, half magnet on the left side is the S utmost point, and half magnet on the right side is the N utmost point, and the coil received the effect of magnetic field power this moment, and half coil on the left side pushes down, and half coil on the right side upwarps, and piezo-resistor Rt' S resistance can diminish, and output voltage UO is:
Uo＝R2*Ui/(R1+R2+Rt)-R4*Ui/(R3+R4)>0
c, when the installation of magnet polarity is reversed, half left side magnet is the N utmost point promptly, and half right side magnet is the S utmost point, and the coil receives the effect of magnetic field power this moment, and half left side coil upwarps, and half right side coil pushes down, and piezo-resistor Rt' S resistance can the grow, and output voltage UO is:
Uo＝R2*Ui/(R1+R2+Rt)-R4*Ui/(R3+R4)<0
therefore, the polarity of the magnet can be detected according to the positive and negative relation of the output voltage Uo, and the existence of the installation reversal of the magnet can be detected.
In the system shown in fig. 1, the laser projector, the data collector and the upper computer cooperate with each other to detect the polarity of the magnet. In conjunction with the system shown in fig. 1, an embodiment of the present application provides a magnet polarity detecting method, as shown in fig. 6, including the following steps:
s101: energizing a coil assembly in the laser projector, wherein the coil assembly extends into a magnetic field space formed between two poles of the magnet through the flexible arm and is suspended in the magnetic field space;
s102: the position information feedback circuit arranged on the flexible arm 6 detects the torsional deformation of the coil assembly driven by the flexible arm 6 under the action of a magnetic field, and outputs voltage signals with opposite directions according to different torsional directions of the flexible arm 6;
s103: and the upper computer determines the installation state of the magnet 5 according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet and the voltage signal output by the position information feedback circuit.
In the embodiment of the method, the laser projector is described in detail in the above embodiment, and is not described again in this embodiment.
It should be noted that the preset voltage signal direction is calculated by the upper computer according to the magnet polarity installed in the installation preset direction and the specific structure of the position information feedback circuit, and after the upper computer receives the voltage signal output by the position information feedback circuit, the upper computer only needs to compare the direction of the received voltage signal with the preset voltage signal direction, so as to obtain the installation state of the magnet.
Fig. 7 is a schematic structural diagram of an upper computer according to an exemplary embodiment of the present application. The control device comprises a memory 701, a processor 702 and a communication component 703;
the memory 701 is used for storing a computer program, and may be configured to store other various data, for example, voltage signal data.
The communication module 703 is configured to receive a voltage signal output by the position information feedback circuit, where the voltage signal is used to energize a coil module in the laser projector, the coil module extends into a magnetic field space formed between two poles of the magnet through the flexible arm and suspends in the magnetic field space, the position information feedback circuit mounted on the flexible arm detects a torsional deformation of the coil module driven by the magnetic field, and the flexible arm has different torsional directions so that the information feedback circuit outputs a voltage signal obtained by a voltage signal in an opposite direction.
A processor 702 for executing a computer program for:
and determining the installation state of the magnet according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet and the voltage signal output by the position information feedback circuit.
Correspondingly, the embodiment of the application also provides a computer readable storage medium storing the computer program. The computer readable storage medium stores a computer program, and the first computer program, when executed by the one or more processors, causes the one or more processors to perform: and determining the installation state of the magnet according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet and the voltage signal output by the position information feedback circuit.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A laser projector, comprising: the coil assembly extends into a magnetic field space formed between two poles of the magnet (5) through the flexible arm (6) and is suspended in the magnetic field space;
a position information feedback circuit is arranged on the flexible arm (6); the coil assembly is electrified and then drives the flexible arm (6) to be twisted and deformed under the action of a magnetic field, the position information feedback circuit is used for detecting the twisting deformation of the flexible arm (6) and outputting voltage signals with opposite directions to the upper computer according to different twisting directions of the flexible arm (6), so that the upper computer can determine the installation state of the magnet (5) according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet;
wherein the position information feedback circuit includes: the coil is connected with the first input end, the second input end and the first output end or the first input end, the second input end and the second output end, the pressure sensitive element is connected between the first input end, the second input end and the first output end or between the first input end, the second input end and the second output end before the coil is not electrified, and the voltage between the first output end and the second output end is zero; after the coil is electrified, the pressure sensitive element is subjected to different external pressures according to different torsion directions of the flexible arm (6), the resistance value of the pressure sensitive element is increased or decreased, and a negative voltage signal or a positive voltage signal is generated between the first output end and the second output end.
2. The laser projector of claim 1 wherein the pressure sensitive element is a piezo-resistor Rt.
3. The laser projector of claim 2 wherein the position information feedback circuit further comprises: a resistor R1, a resistor R2 and a resistor R3;
the resistor R1, the resistor R2, the resistor R3 and the piezoresistor Rt are connected in series, one group of opposite series points in the four series points form two input ends, and the other group of opposite series points form two output ends; the two input ends are used for connecting an external power supply, and the two output ends are used for outputting voltage signals; before the coil is not electrified, the voltage between the two output ends is zero; after the coil is electrified, the resistance value of the piezoresistor is increased or decreased according to the different twisting directions of the flexible arm (6), so that a negative voltage signal or a positive voltage signal is generated between the two output ends.
4. The laser projector according to claim 1, further comprising a galvanometer (4), wherein the coil assembly comprises a support (2) and a coil (3) installed on the support (2), the galvanometer (4) is installed on the support (2) and the galvanometer (4) is inserted into the coil (3), and the other end of the flexible arm (6) is connected with the support (2).
5. A laser projector as claimed in claim 1, characterized in that the galvanometer (4) is mounted on the support (2) by means of a horizontally flexible arm (7).
6. A magnet polarity detection system, comprising: the system comprises a laser projector, a data acquisition unit and an upper computer;
the laser projector comprises a magnet (5), a coil assembly and a flexible arm (6), one end of the flexible arm (6) is fixed, the other end of the flexible arm is connected with the coil assembly, and the coil assembly extends into a magnetic field space formed between two poles of the magnet (5) through the flexible arm (6) and is suspended in the magnetic field space; a position information feedback circuit is arranged on the flexible arm (6); the coil assembly is electrified and then drives the flexible arm (6) to be twisted and deformed under the action of a magnetic field, and the position information feedback circuit is used for detecting the twisting deformation of the flexible arm (6) and outputting voltage signals with opposite directions to the upper computer according to different twisting directions of the flexible arm (6);
the data acquisition unit is used for acquiring the voltage signal and sending the voltage signal to an upper computer;
the upper computer determines the installation state of the magnet (5) according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet and the voltage signal output by the position information feedback circuit;
wherein the position information feedback circuit includes: the coil is connected with the first input end, the second input end and the first output end or the first input end, the second input end and the second output end, the pressure sensitive element is connected between the first input end, the second input end and the first output end or between the first input end, the second input end and the second output end before the coil is not electrified, and the voltage between the first output end and the second output end is zero; after the coil is electrified, the pressure sensitive element is subjected to different external pressures according to different torsion directions of the flexible arm (6), the resistance value of the pressure sensitive element is increased or decreased, and a negative voltage signal or a positive voltage signal is generated between the first output end and the second output end.
7. The magnet polarity detection system according to claim 6, further comprising: the power supply module, power supply module's input and host computer are connected, and power supply module's output is connected with coil pack and position information feedback circuit's first input and second input, and host computer control power supply module is the power supply of coil pack and position information feedback circuit.
8. A method for detecting the polarity of a magnet, comprising:
energizing a coil assembly in the laser projector, wherein the coil assembly extends into a magnetic field space formed between two poles of the magnet through the flexible arm and is suspended in the magnetic field space;
a position information feedback circuit arranged on the flexible arm (6) detects the torsional deformation of the coil assembly driven by the flexible arm (6) under the action of a magnetic field, and outputs voltage signals with opposite directions according to different torsional directions of the flexible arm (6);
the upper computer determines the installation state of the magnet (5) according to the corresponding relation between the preset voltage signal direction and the installation state of the magnet and the voltage signal output by the position information feedback circuit;
wherein the position information feedback circuit includes: the coil is connected with the first input end, the second input end and the first output end or the first input end, the second input end and the second output end, the pressure sensitive element is connected between the first input end, the second input end and the first output end or between the first input end, the second input end and the second output end before the coil is not electrified, and the voltage between the first output end and the second output end is zero; after the coil is electrified, the pressure sensitive element is subjected to different external pressures according to different torsion directions of the flexible arm (6), the resistance value of the pressure sensitive element is increased or decreased, and a negative voltage signal or a positive voltage signal is generated between the first output end and the second output end.
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