Signal transmission device of laser correlation product

Abstract

The invention relates to a signal transmission device of a laser correlation product. The signal transmission device comprises a transmitting end, a receiving end and a transmitting end, wherein the transmitting end comprises a single-chip microcomputer unit, a signal modulation unit, a constant-current control unit, a driving tube unit and a laser diode unit; and the receiving end comprises a receiving photoelectric tube unit, a signal amplification unit, a signal shaping unit, a signal demodulation unit and a single chip microcomputer unit. The single-chip microcomputer of the transmitting end outputs a power signal, a carrier signal and a modulation signal respectively, the power signal, the carrier signal and the modulation signal are modulated by the signal modulation unit and then synthesized into one path of signal, and the signal is sent to the constant current control unit to control the driving tube to drive the laser diode to output laser with modulated frequency and perform constant current according to corresponding power. A receiving photoelectric tube of the receiving end converts a received optical signal into an electric signal, the electric signal is amplified by a signal amplification unit, is compared and shaped by a signal shaping unit and then is output, the electric signal is sent to a signal demodulation unit and is subjected to frequency signing with a local oscillator signal of the signal demodulation unit, and a demodulation signal with the same frequency as a modulation signal of the transmitting end is output; and the single-chip microcomputer identifies the demodulation signal and outputs a corresponding state.

Description

Technical Field

[0001] The invention relates to the technical field of perimeter security, and in particular to a signal transmission device for a laser beam-shooting product. Background Art

[0002] 1. In the field of perimeter protection, current laser beam products generally adopt the following description: Figure 1 The signal transmission method of the block diagram: the output signal of the transmitting microcontroller directly controls the driving tube to drive the laser diode to emit laser, and the photoelectric tube at the receiving end converts the optical signal into an electrical signal, which is amplified and shaped and then directly sent to the receiving microcontroller for processing. The microcontroller outputs the control result of the corresponding state after internal recognition.

[0003] 2. Defects of the existing technology:

[0004] (1) Figure 1 The signal transmission method is a method in which the signal has no modulation or demodulation, the transmitting microcontroller directly sends the code, and the receiving microcontroller directly reads the code.

[0005] (2) Since the receiving end reads the code directly, when there is other light with a similar wavelength from the outside, such as sunlight, building lights, remote controls, laser flashlights, etc., shining on the receiving photoelectric tube, the received signal will be amplified and shaped synchronously and sent to the receiving microcontroller together, forming a multi-signal superposition, turning the wrong signal into a correct signal, or the correct signal will be identified as an error signal due to the superposition of other signals, etc., causing the microcontroller to be easily interfered with and cause false alarms or missed alarms. Summary of the invention

[0006] In view of this, the purpose of the present invention is to address the problem of easy interference of signals in existing products. The present invention adds a signal carrier modulation circuit at the laser transmitting end, and adds a signal frequency discrimination demodulation circuit at the receiving end after signal amplification and shaping to improve the above-mentioned problem of easy interference of signals, and adds a constant current output circuit at the laser transmitting end to improve the stability of laser output, thereby improving the reliability of the equipment.

[0007] 1. The present invention is achieved through the following technical solutions:

[0008] 1. A signal transmission device for a laser beam product, comprising a transmitting end: a single-chip microcomputer unit, a signal modulation unit, a constant current control unit, a driving tube unit and a laser diode unit; a receiving end: a receiving photoelectric tube unit, a signal amplification unit, a signal shaping unit, a signal demodulation unit, and a single-chip microcomputer unit.

[0009] 2. The scheme is further as follows: the transmitting end outputs the laser power signal required to drive the laser, the low-frequency carrier signal for signal modulation, and the low-frequency modulation signal respectively by the single-chip unit, and after modulation by the signal modulation unit, a modulated frequency signal is synthesized and input into the constant current control unit, and the constant current control unit controls the output current of the driving tube unit and performs constant current, and the driving tube unit drives the laser diode unit to emit a laser with an output power and modulated frequency corresponding to the preset output power of the single-chip unit.

[0010] 3. The scheme is further as follows: the receiving end converts the laser signal received from the transmitting end into an electrical signal output by the receiving photoelectric tube, and the electrical signal is amplified by the signal amplification unit and sent to the signal shaping unit for comparison and shaping, and then the restored modulated pulse frequency signal is output to the signal demodulation unit. The signal demodulation unit discriminates the received modulation frequency signal and the local oscillator frequency and then outputs a demodulation signal that is the same as the low-frequency modulation frequency of the transmitting end. The single-chip unit identifies the received demodulation frequency signal and outputs the corresponding state.

[0011] 2. The beneficial effects of the present invention are:

[0012] Due to the addition of signal modulation at the transmitting end and signal demodulation at the receiving end, external interference light signals are not received or demodulated, which greatly reduces the problem of misidentification, improves the product's anti-interference ability, effectively reduces missed reports and false alarms during use, and improves the reliability and safety of the equipment; and adds an output constant current circuit at the laser transmitting end to ensure the stability of the output laser, thereby improving the stability of the equipment.

[0013] 3. The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0015] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description, wherein the attached drawings are as follows: Figure 1 is a signal transmission block diagram of the prior art implementation scheme in the above background technology, Figure 2 to Figure 4These are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is a circuit signal logic block diagram of a signal transmission device for a common laser beam product;

[0018] Figure 2 A circuit signal logic block diagram of a signal transmission device for a laser beam product provided by an embodiment of the present invention;

[0019] Figure 3 A circuit diagram of a transmitting end of a signal transmission device of a laser beam transmitting product provided by an embodiment of the present invention;

[0020] Figure 4 A circuit diagram of a receiving end of a signal transmission device of a laser beam transmitting product provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] To facilitate understanding of this embodiment, the embodiment of the present invention is described in detail below:

[0023] 1. The embodiment of the present invention provides a signal transmission device for a laser beam product, such as Figure 2 As shown, it includes a transmitting end: a single-chip microcomputer unit, a signal modulation unit, a constant current control unit, a driving tube unit and a laser diode unit; a receiving end: a receiving photoelectric tube unit, a signal amplification unit, a signal shaping unit, a signal demodulation unit, and a single-chip microcomputer unit.

[0024] 2. Figure 3 This is a connection diagram of the transmitting end of the above-mentioned signal transmission device.

[0025] (1) In the embodiment: pin 1 of the single-chip unit (1) is connected to the upper end of the capacitor C3 and the power supply 3.3V network, pin 2 of the single-chip unit (1) is grounded to the lower end of the capacitor C3, pin 3 of the single-chip unit (1) is connected to the upper end of R10 of the signal modulation unit (2), pin 4 of the single-chip unit (1) is connected to pin 6 of the chip U4 of the signal modulation unit (2), and pin 5 of the single-chip unit (1) is connected to pin 6 of the chip U5 of the signal modulation unit (2).

[0026] (2) In the embodiment: the lower end of R10 of the signal modulation unit (2) is respectively connected to the upper end of the capacitor C20 and the pin1 of the chip U4, the pin2 and pin3 of the chip U4 are grounded, the pin5 of the chip U4 is connected to the upper end of the capacitor C22 and the power supply 3.3V network, the lower end of the capacitor C22 is grounded, the pin4 of the chip U4 is connected to the pin1 of U5, the pin2 and pin3 of the chip U5 are grounded, the pin5 of the chip U5 is connected to the upper end of the capacitor C23 and the power supply 3.3V network, the lower end of the capacitor C23 is grounded, and the pin4 of the chip U5 is connected to the left end of the resistor R2 of the constant current control unit (3).

[0027] (3) In the embodiment: the right end of the resistor R2 of the constant current control unit (3) is connected to the pin1 of the operational amplifier chip U2, the pin2 of the chip U2 is grounded, the pin5 of the chip U2 is connected to the right ends of the capacitors C1 and C2 and the power supply VCC network, the left ends of the capacitors C1 and C2 are grounded, the pin3 of the chip U2 is connected to the left end of the resistor R4, the right end of the resistor R4 is respectively connected to the upper end of the resistor R5 and the S end of the driving tube unit (4) Q1, the lower end of the resistor R5 is grounded, the pin4 of the chip U2 is connected to the left end of the resistor R3, and the right end of the resistor R3 is connected to the G end of the driving tube unit (4) Q1.

[0028] (4) In the embodiment: the D end of the driving tube unit (4) Q1 is connected to the pin1 of the laser diode unit (5) LED1.

[0029] (5) In the embodiment: the pin 2 of the laser diode unit (5) LED1 is connected to the VCC power supply network, and the pin 3 of LED1 is left floating.

[0030] 3. Figure 4 This is a connection diagram of the receiving end of the above signal transmission device.

[0031] (1) In the embodiment: the negative end of D5 of the receiving photoelectric tube unit (A) is respectively connected to pin 3 of chip U1 of the signal amplifying unit (B), capacitor C14 and the left end of resistor R17, and the positive end of D5 is grounded.

[0032] (2) In the embodiment: pin1 and pin2 of the chip U1 of the signal amplification unit (B) are both grounded, pin5 of the chip U1 is connected to the upper ends of capacitors C16 and C15 and the power supply +5V network, the lower ends of capacitors C16 and C15 are grounded, pin4 of the chip U1 is respectively connected to the right end of capacitor C14 and resistor R17, the upper end of resistor R13 and the left end of R36 of the signal shaping unit (C), and the lower end of resistor R13 is grounded.

[0033] (3). In the embodiment: pin3 of chip U8-A of the signal shaping unit (C) is connected to the right end of resistor R36, pin4 of chip U8-A is grounded, pin2 of chip U8-A is respectively connected to the lower end of resistor R37 and the upper end of resistor R38 and capacitor C4, the lower ends of resistor R38 and capacitor C4 are grounded, pin8 of chip U8-A is respectively connected to the upper end of resistor R37, the left ends of capacitors C36 and C37, the upper end of resistor R43 and the power supply +5V network, the right ends of capacitors C36 and C37 are grounded, pin1 of chip U8-A is respectively connected to the lower end of resistor R43 and the left end of capacitor C30, and the right end of capacitor C30 is connected to pin3 of chip U7 of the signal demodulation unit (D).

[0034] (4) In the embodiment: pin1 of the chip U7 of the signal demodulation unit (D) is connected to the upper end of the capacitor C31, the lower end of the capacitor C31 is grounded, pin2 of the chip U7 is connected to the upper end of the capacitor C32, the lower end of the capacitor C32 is grounded, pin4 of the chip U7 is respectively connected to the left ends of the capacitors C17 and C19 and the power supply +5V network, the right ends of the capacitors C17 and C19 are grounded, pin7 of the chip U7 is grounded, pin5 of the chip U7 is connected to the upper end of the resistor R29, the lower end of the resistor R29 is respectively connected to pin6 of the chip U7 and the upper end of the capacitor C33, the lower end of the capacitor C33 is grounded, pin8 of the chip U7 is respectively connected to the lower end of the resistor R32 and the left end of the resistor R45, the upper end of the resistor R32 is connected to the power supply +5V network, the right end of the resistor R45 is respectively connected to the upper end of the capacitor C39 and pin1 of the chip U9 of the single-chip unit (E), and the lower end of the capacitor C39 is grounded.

[0035] (5). In the embodiment: pin2 of the chip U9 of the single-chip unit (E) is grounded, pin3 of the chip U9 is connected to the upper end of the buzzer SP1, the lower end of the buzzer SP1 is grounded, pin4 of the chip U9 is connected to the left end of the resistor R46, the right end of the resistor R46 is connected to the positive electrode of the light-emitting diode D1, the negative electrode of the light-emitting diode D1 is grounded, pin5 of the chip U9 is respectively connected to the upper ends of the capacitors C34 and C25 and the power supply +5V network, and the lower ends of the capacitors C34 and C25 are grounded.

[0036] 4. The working process of the transmitter of the signal transmission device is as follows:

[0037] (1) In the embodiment: Figure 3As shown, the power supply 3.3V supplies power to the three chips through pin1 of microcontroller U1, pin6 of chips U4 and U5, and capacitors C3, C22, and C23 perform power filtering; the power supply VCC supplies power to the operational amplifier and laser diode through pin5 of chip U2 and pin2 of laser diode LED1, and capacitors C1 and C2 perform power filtering.

[0038] (2) In the embodiment: the pin2 of the single-chip microcomputer outputs a set laser power level signal, which is isolated by R10 and filtered by C10 before being sent to pin1 of chip U4; the pin4 of the single-chip microcomputer outputs a set carrier frequency signal to pin6 of chip U4, which is used to control the conduction of the signal transmitted from pin1 of chip U4 to pin4; the pin4 of chip U4 outputs an analog level signal with the carrier frequency added to it and sends it to pin1 of chip U5; the pin5 of the single-chip microcomputer outputs a set modulation frequency signal to pin6 of chip U5, which is used to control the conduction of the signal transmitted from pin1 of chip U5 to pin4, and the pin4 of chip U5 outputs an analog level signal with the carrier frequency and modulation frequency added to it.

[0039] (3) In the embodiment: the analog level signal with carrier frequency and modulation frequency added to the output of pin4 of the chip U5 is coupled by resistor R2 and input to the positive input terminal pin1 of the operational amplifier chip U2, amplified by the operational amplifier and output from pin4, coupled by resistor R3 and sent to the G pole of the driver tube Q1, so that the driver MOS tube Q1 is turned on, and the laser diode LED1 is turned on through the resistor R5 connected in series with Q1 to emit a laser with corresponding carrier frequency and modulation frequency, and the current is sampled by resistor R5 and coupled by R4 and input to the negative input terminal pin3 of the operational amplifier chip U2, and the output current is stabilized to the set corresponding analog level signal value after negative feedback, so that the laser diode outputs a constant current.

[0040] 5. The working process of the receiving end of the signal transmission device is as follows:

[0041] (1) In the embodiment: Figure 4 As shown, the receiving photoelectric tube D5 converts the laser light signal received from the transmitting end into an electrical signal, which is output from the negative electrode of D5 to the input terminal pin3 of the chip U1. The signal is amplified and output from pin4. The resistor R17 and the capacitor C14 are connected in parallel to control the amplification factor and frequency selection of the chip.

[0042] (2) In the embodiment: the amplified electrical signal is coupled to pin3 of U8-A via R36, and is compared and shaped with the voltage divider input pin2 composed of resistors R37 and R38 inside the chip, and the shaped pulse signal is output from pin1. This signal corresponds to the carrier frequency and modulation frequency of the transmitting end.

[0043] (3) In the embodiment: the shaped pulse signal is coupled by capacitor C30 and input to pin3 of U7. When the chip detects that the input carrier frequency is consistent with the local oscillator frequency formed by R29 and C33, a demodulated signal consistent with the modulation frequency is output from pin8.

[0044] (4) In the embodiment: the demodulated signal is coupled through resistor R45, and capacitor C39 filters out interference and is sent to pin1 of microcontroller U9. The microcontroller internally identifies whether the signal input by pin1 meets the frequency set by the software. When it is identified as a correct signal, both pin3 and pin4 output a low level, and the microcontroller does not act or alarm.

[0045] (5) In the embodiment: When someone passes through the optical path between the transmitting end and the receiving end, the received laser signal is interrupted and the single chip microcomputer does not receive the signal. The single chip microcomputer activates an alarm: pin 4 of U9 outputs a high level to drive the D1 light on, and pin 3 outputs a high level to cause the buzzer to sound an alarm.

[0046] (6) In the embodiment: when the received interference signal frequency is not consistent with the carrier frequency, it will not be demodulated and the single chip microcomputer will not be interfered; when the received interference signal is consistent with the carrier frequency but the modulation signal frequency is inconsistent, although it will be demodulated, the demodulation signal frequency is incorrect and the single chip microcomputer will not be interfered.

[0047] 6. In summary, the present invention increases the signal modulation at the transmitting end and the signal demodulation at the receiving end, so that the general external optical signal is not received or demodulated, thereby greatly reducing the problem of misidentification, improving the anti-interference ability of the product, effectively reducing the missed alarms and false alarms during use, and improving the reliability and safety of the equipment; and adding an output constant current circuit at the laser transmitting end to ensure the stability of the output laser, improve the stability of the equipment, and achieve the purpose of safety and reliability.

[0048] 7. The modulation frequency configuration of the present invention can be flexibly controlled and modified by software. Even when a digital potentiometer is used in the receiving local oscillator frequency part, its carrier frequency can also be flexibly controlled and modified by software, which greatly improves the convenience of application.

[0049] Furthermore, an embodiment of the present invention provides a signal transmission device for a laser beam product, which has good practical value and can be used in the fields of perimeter security, electronic fences, etc.

[0050] The device provided in the embodiment of the present invention may be specific hardware on the device or software or firmware installed on the device. The implementation principle and technical effects of the device provided in the embodiment of the present invention are the same as those of the aforementioned method embodiment. For the sake of brief description, the contents not mentioned in the device embodiment, such as the replacement of the digital potentiometer, etc., can refer to the corresponding contents in the aforementioned method embodiment.

[0051] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can all refer to the corresponding processes in the above method embodiments and will not be repeated here.

[0052] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0053] In addition, each functional unit in the embodiment provided by the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0054] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0055] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as "left end", "right end", "upper end", "lower end", "pinX (X represents a number)" and the like are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the above terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A signal transmission device for a laser beam product, comprising a transmitting end: a single-chip microcomputer unit, a signal modulation unit, a constant current control unit, a driving tube unit and a laser diode unit; a receiving end: a receiving photoelectric tube unit, a signal amplification unit, a signal shaping unit, a signal demodulation unit, and a single-chip microcomputer unit.

2. The transmitting end of the signal transmission device of the laser beam product according to claim 1, characterized in that: The transmitting end outputs the laser power signal required to drive the laser, the low-frequency carrier signal for signal modulation, and the low-frequency modulation signal respectively by the single-chip unit chip U1. After modulation by the signal modulation unit chips U4 and U5, a modulated signal is synthesized and input into the constant current control unit. The constant current control unit operational amplifier chip U2 controls the output current of the driving tube unit and performs constant current. The driving tube unit Q1 drives the laser diode unit LED1 to emit a laser with a power and modulated frequency corresponding to the output value of the single-chip unit.

3. The receiving end of the signal transmission device of the laser beam product according to claim 2, characterized in that: The receiving photoelectric tube D5 converts the laser signal received from the transmitting end into an electrical signal for output. The electrical signal is amplified by the signal amplification unit U1 and sent to the signal shaping unit U8-A for comparison. After shaping, the restored modulated pulse frequency signal is output to the signal demodulation unit U7. The signal demodulation unit U7 signs the received modulation frequency signal and the local oscillation frequency signal generated by U7 itself, and then outputs a demodulation signal that is the same as the low-frequency modulation frequency signal of the transmitting end. The single-chip microcomputer unit U9 identifies the received demodulation frequency signal and outputs the corresponding state.

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