Infrared grating with signal strength indication function

Abstract

The utility model relates to an echelette grating with a signal strength indication function. The echelette grating comprises a photosensitive module, an amplification module electrically connected to the photosensitive module, a band-pass filtering module electrically connected to the amplification module, a control module electrically connected to the band-pass filtering module, and an indication module. The photosensitive module is used for receiving infrared signals. The photosensitive module outputs an initial signal to the amplification module. The amplification module is used for amplifying the initial signal into an amplified signal, and the amplified signal is output to the band-pass filtering module. And the band-pass filtering module is used for filtering the amplified signal into a de-noised signal, and the de-noised signal is output to the control module. And the control module outputs receiving strength information to the indication module, and the strength of the receiving strength information is associated with the strength of the de-noised signal, so that the strength of the de-noised signal can be integrally greater than a preset threshold value in a fluctuation range under the condition that the infrared signal is not shielded in an operation state, and the condition that the infrared grating triggers an alarm by mistake is avoided.

Description

Technical Field

[0001] This application relates to the field of perimeter protection technology, and in particular to an infrared grating with signal strength indication function. Background Technology

[0002] Infrared blinds are primarily used for monitoring, early warning, and preventing unauthorized intrusions into border areas. They can identify intrusion targets crossing the border. An infrared blind consists of an infrared emitting unit and an infrared receiver. The emitting unit transmits the infrared signal, and the receiver receives it. When the infrared signal is blocked, causing the receiver to not receive the signal, it triggers an alarm to indicate the presence of an intrusion target.

[0003] Traditional infrared gratings typically use infrared receiver heads that output digital signals. However, the digital signals output by these receiver heads cannot distinguish the strength of the received infrared signals; they can only indicate whether an infrared signal has been received. Therefore, during installation and debugging, traditional infrared gratings cannot achieve their strongest signal reception, resulting in poor interference resistance.

[0004] After installation, traditional infrared gratings are prone to generating false alarms due to power fluctuations or other interference factors in the transmitting section. Utility Model Content

[0005] Based on this, the present invention provides an infrared grating with signal strength indication function that can solve or at least alleviate the above-mentioned technical problems.

[0006] This utility model provides an infrared grating with signal strength indication function, comprising:

[0007] A photosensitive module is used to receive infrared signals and output an initial signal associated with the intensity of the infrared signals;

[0008] An amplification module, electrically connected to the photosensitive module, is used to amplify the initial signal into an amplified signal;

[0009] A bandpass filter module is electrically connected to the amplification module and is used to filter the amplified signal into a denoised signal;

[0010] The control module, electrically connected to the bandpass filter module, outputs received signal strength information correlated with the strength of the denoised signal; when the strength of the denoised signal is lower than a preset threshold, the control module outputs an alarm drive signal; and

[0011] An indication module is used to receive reception strength information output by the control module, has at least two indication states, and switches between the at least two indication states according to changes in the reception strength information.

[0012] The infrared grating with signal strength indication function in this application has a photosensitive module that generates an initial signal related to the intensity of the received infrared signal after receiving the infrared signal. An amplification module amplifies the initial signal so that its voltage level reaches the input recognition range of the control module. The photosensitive module often receives both the infrared signal and environmental interference signals simultaneously. A bandpass filter module filters out the portion of the amplified signal corresponding to environmental interference signals, preventing the control module from being affected by environmental interference. When the intensity of the denoised signal is lower than a preset threshold, the control module outputs an alarm drive signal to promptly alert the user to the presence of an intrusion target. Based on the intensity of the denoised signal, the control module outputs corresponding received signal strength information. The specific content of the received signal strength information varies depending on the intensity of the denoised signal. Based on the specific content of the received signal strength information, the indication module switches to the corresponding indication state. When adjusting the installation position and angle of the infrared grating, the construction personnel can confirm the infrared signal reception strength according to the indication status of the indicator module, and can optimize the installation position and angle of the infrared grating in a timely manner. This ensures that the intensity of the noise reduction signal is greater than the preset threshold within the fluctuation range when the infrared signal is not blocked during operation, thus avoiding the infrared grating from triggering alarms erroneously.

[0013] In one embodiment, the photosensitive module includes a photodiode RD1 and a resistor R1; the anode of the photodiode RD1 is electrically connected to one end of the resistor R1, and the anode of the photodiode RD1 is electrically connected to the input terminal of the amplification module; the cathode of the photodiode RD1 is used to electrically connect to a reference voltage point; and the other end of the resistor R1 is used to ground.

[0014] In one embodiment, the photosensitive module further includes a capacitor C1 and a resistor R2; the capacitor C1 is electrically connected between the anode of the photodiode RD1 and the input terminal of the amplification module; one end of the resistor R2 is electrically connected to the input terminal of the amplification module, and the other end is used for grounding.

[0015] In one embodiment, the amplification module includes at least two amplification units; the at least two amplification units are connected in series between the photosensitive module and the bandpass filter module.

[0016] In one embodiment, the amplification module further includes a capacitor C2 and a resistor R5; the capacitor C2 is electrically connected between the output terminal of one amplification unit and the input terminal of another amplification unit; one end of the resistor R5 is electrically connected to the input terminal of the other amplification unit, and the other end is used for grounding.

[0017] In one embodiment, one amplification unit includes an operational amplifier U1B, resistor R3, and resistor R13; the non-inverting input of the operational amplifier U1B is electrically connected to the output of the photosensitive module; resistors R3 and R13 are connected in series between the output of the operational amplifier U1B and ground; the connection point between resistors R3 and R13 is electrically connected to the inverting input of the operational amplifier U1B; and the output of the operational amplifier U1B is electrically connected to another amplification unit.

[0018] In one embodiment, the bandpass filter module includes capacitor C3, capacitor C4, resistor R6, and resistor R7; one end of capacitor C3 is electrically connected to the output terminal of the amplification module, and the other end is electrically connected to one end of resistor R7; the other end of one end of resistor R7 is electrically connected to the input terminal of the control module; resistor R6 is electrically connected between one end of resistor R7 and ground; and capacitor C4 is electrically connected between the other end of resistor R7 and ground.

[0019] In one embodiment, the indicating module includes a light-emitting element.

[0020] In one embodiment, the indicating module includes a sound-emitting element.

[0021] In one embodiment, a slave module is also included; in operation, the slave module is used to send infrared signals to the photosensitive module. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an infrared grating host with signal strength indication according to an embodiment of this application.

[0023] Figure 2 This is a partial circuit diagram of an infrared grating host with signal strength indication according to an embodiment of this application.

[0024] Reference numerals: 100, Infrared grating with signal strength indication function; 20, Slave module; 40, Photosensitive module; 50, Amplification module; 51, Amplification unit; 60, Bandpass filter module; 70, Control module; 80, Indication module; S1, Infrared signal. Detailed Implementation

[0025] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, direct connections, indirect connections via an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] The technical solutions provided by the embodiments of this application are described below with reference to the accompanying drawings.

[0029] Combination Figure 1 As shown, this application also provides an infrared grating 100 with signal strength indication function. Exemplarily, the infrared grating 100 with signal strength indication function is used to detect the boundary of a specific area, and promptly detect intrusion targets illegally entering the specific area.

[0030] Specifically, in combination Figure 1 As shown, the infrared grating 100 with signal strength indication function includes a slave module 20. The slave module 20 is capable of generating an infrared signal S1.

[0031] In some implementations, combined Figure 1 and Figure 2As shown, the infrared grating 100 with signal strength indication function includes: a photosensitive module 40, an amplification module 50 electrically connected to the photosensitive module 40, a bandpass filter module 60 electrically connected to the amplification module 50, a control module 70 electrically connected to the bandpass filter module 60, and an indication module 80. The photosensitive module 40 receives the infrared signal S1. The photosensitive module 40 outputs an initial signal to the amplification module 50, the intensity of which is correlated with the intensity of the infrared signal S1. The amplification module 50 amplifies the initial signal into an amplified signal, which is then output to the bandpass filter module 60. The bandpass filter module 60 filters the amplified signal into a denoised signal, which is then output to the control module 70. The control module 70 outputs received intensity information to the indication module 80, the content of which is correlated with the intensity of the denoised signal. When the intensity of the denoised signal is lower than a preset threshold, the control module 70 outputs an alarm drive signal. The indication module 80 has at least two indication states, and switches between these states according to changes in the received intensity information.

[0032] The infrared grating 100 with signal strength indication function of this application generates an initial signal associated with the intensity of the received infrared signal S1 after the photosensitive module 40 receives the infrared signal S1. The amplification module 50 amplifies the initial signal so that the voltage level of the amplified signal can reach the input recognition range of the control module 70. The photosensitive module 40 often receives both the infrared signal S1 and environmental interference signals simultaneously. The bandpass filter module 60 can filter out the portion of the amplified signal corresponding to the environmental interference signal, preventing the control module 70 from being interfered with by environmental interference signals. When the intensity of the denoised signal is lower than a preset threshold, the control module 70 outputs an alarm drive signal to promptly alert the user to the presence of an intrusion target. Based on the intensity of the denoised signal, the control module 70 outputs corresponding received strength information. The specific content of the received strength information varies depending on the intensity of the denoised signal. Based on the specific content of the received strength information, the indication module 80 switches to the corresponding indication state. When adjusting the installation position and angle of the infrared grating, the construction personnel can confirm the received strength of the infrared signal S1 according to the indication status of the indicator module 80, and can optimize the installation position and angle of the infrared grating in a timely manner. This ensures that the strength of the noise reduction signal is greater than the preset threshold within the fluctuation range when the infrared signal S1 is not blocked during operation, thus avoiding the infrared grating from triggering alarms erroneously.

[0033] Understandably, in operation, the slave module 20 and the photosensitive module 40 are distributed at intervals along the boundary of a specific area, and the slave module 20 sends an infrared signal S1 to the photosensitive module 40. When an intrusion target passes between the slave module 20 and the photosensitive module 40, the intrusion target blocks the infrared signal S1, and the photosensitive module 40 cannot receive the infrared signal S1, so the infrared grating 100 with signal strength indication function enters the alarm state.

[0034] Understandably, the infrared light grid 100 with signal strength indication function will alert the user to the presence of an intrusion target in an alarm state. Optionally, the infrared light grid 100 with signal strength indication function will emit an audible alarm signal or a visual alarm signal in an alarm state.

[0035] For example, during installation and commissioning, the indicator module 80 is used to distinguish the signal strength of the received infrared signal S1. In operation, the indicator module 80 emits an alarm light or alarm sound according to the alarm drive signal.

[0036] For example, the infrared grating 100 with signal strength indication function also includes a communication module. Optionally, the alarm drive signal is sent from the communication module to other modules of the infrared grating 100 with signal strength indication function. Optionally, the alarm drive signal is sent from the communication module to the security system host. Optionally, the communication module can send the alarm drive signal in the form of a wired signal. Optionally, the communication module can send the alarm drive signal in the form of a wireless signal.

[0037] For example, environmental interference signals include natural light or artificial light sources that may cause interference.

[0038] In some implementations, combined Figure 2 As shown, the photosensitive module 40 includes a photodiode RD1 and a resistor R1. The anode of photodiode RD1 is electrically connected to one end of resistor R1, and the anode of photodiode RD1 is indirectly or directly electrically connected to the input terminal of amplifier module 50. The cathode of photodiode RD1 is used to electrically connect to a reference voltage point. The other end of resistor R1 is used for grounding. Understandably, photodiode RD1 is in a reverse bias state, and the reverse current of photodiode RD1 increases with the increase of external light intensity. When infrared signal S1 irradiates photodiode RD1, the reverse current of photodiode RD1 increases. Since the reverse current through photodiode RD1 flows to resistor R1, a changing voltage can be generated at one end of resistor R1. When infrared signal S1 irradiates photodiode RD1, the voltage at one end of resistor R1 rises, thereby converting the light intensity change of infrared signal S1 into a voltage intensity change.

[0039] In some implementations, the infrared signal S1 is a flashing signal. For example, the infrared signal S1 flashes on and off at a certain frequency.

[0040] In some implementations, combined Figure 2 As shown, the photosensitive module 40 also includes a capacitor C1 and a resistor R2. Capacitor C1 is electrically connected between the anode of photodiode RD1 and the input terminal of amplifier module 50. One end of resistor R2 is electrically connected to the input terminal of amplifier module 50, and the other end is grounded. Understandably, capacitor C1 acts as a AC-passing, DC-blocking capacitor between the anode of photodiode RD1 and the input terminal of amplifier module 50. When photodiode RD1 does not receive the infrared signal S1, the voltage across capacitor C1 remains unchanged, and therefore no current flows through resistor R2. At this time, the input terminal of amplifier module 50 is locked at a low level, thus preventing amplifier module 50 from amplifying environmental interference signals.

[0041] When photodiode RD1 receives an alternating on / off infrared signal S1, its reverse current changes accordingly, causing the voltage across resistor R2 to fluctuate repeatedly. Consequently, charge alternately flows into and out of capacitor C1. The current corresponding to this charge flow passes through resistor R2, thus creating an alternating voltage at the input of amplifier module 50, the amplitude of which corresponds to the intensity of the infrared signal S1.

[0042] In some implementations, combined Figure 2 As shown, the amplification module 50 includes at least two amplification units 51. The at least two amplification units 51 are connected in series between the photosensitive module 40 and the bandpass filter module 60, thereby amplifying the initial signal more than twice to ensure that the voltage level of the amplified signal can reach the input recognition range of the control module 70.

[0043] For example, the amplification module 50 includes two amplification units 51. The input terminal of one amplification unit 51 is electrically connected to the output terminal of the photosensitive module 40. The input terminal of the other amplification unit 51 is electrically connected to the output terminal of the aforementioned amplification unit 51, and the output terminal of the other amplification unit 51 is electrically connected to the bandpass filter module 60.

[0044] In some implementations, combined Figure 2As shown, the amplification module 50 also includes a capacitor C2 and a resistor R5. The capacitor C2 is electrically connected between the output terminal of one amplification unit 51 and the input terminal of the other amplification unit 51. One end of the resistor R5 is electrically connected to the input terminal of the other amplification unit 51, and the other end is grounded. Understandably, the input terminal of one amplification unit 51 is electrically connected to the photosensitive module 40. The signal output by this amplification unit 51 can be understood as consisting of an AC signal component and a small amount of DC signal component. Under the action of the capacitor C2 and resistor R5, the small amount of DC signal component in the output signal of one amplification unit 51 can be filtered, more thoroughly eliminating interference from environmental interference signals or eliminating errors caused by the photosensitive module 40. This allows the subsequent amplification unit 51 to more effectively amplify the AC signal component corresponding to the infrared signal S1, resulting in a larger difference between the peaks and troughs of the final amplified signal, allowing the control module 70 to more accurately identify changes in the amplified signal.

[0045] In some implementations, combined Figure 2 As shown, one amplification unit 51 includes an operational amplifier U1B, resistors R3 and R13. The non-inverting input of operational amplifier U1B is electrically connected to the output of the photosensitive module 40. Resistors R3 and R13 are connected in series between the output of operational amplifier U1B and ground. The connection point between resistors R3 and R13 is electrically connected to the inverting input of operational amplifier U1B. The output of operational amplifier U1B is electrically connected to another amplification unit 51, thus enabling amplification unit 51 to amplify the initial signal. By setting the ratio of resistors R3 and R13, the amplification factor of the initial signal by amplification unit 51 can be controlled.

[0046] For example, combined Figure 2 As shown, the amplification unit 51 includes an operational amplifier U1A, resistors R4 and R14. The non-inverting input of operational amplifier U1A is electrically connected to the output of operational amplifier U1B. Resistors R4 and R14 are connected in series between the output of operational amplifier U1A and ground. The connection point between resistors R4 and R14 is electrically connected to the inverting input of operational amplifier U1A. The output of operational amplifier U1A outputs an amplified signal to the bandpass filter module 60. Understandably, by setting the ratio of resistors R4 and R14, the amplification factor of the initial signal by this amplification unit 51 can be controlled.

[0047] Understandably, in the transmission environment of infrared signal S1, in addition to low-frequency signals such as natural light that have almost no flicker, there may also be other signals with higher frequencies than infrared signal S1, which may interfere with the identification of control module 70.

[0048] In some implementations, combined Figure 2 As shown, the bandpass filter module 60 includes capacitors C3 and C4, resistors R6 and R7. One end of capacitor C3 is electrically connected to the output terminal of amplifier module 50, and the other end is electrically connected to one end of resistor R7. The other end of one end of resistor R7 is electrically connected to the input terminal of control module 70. Resistor R6 is electrically connected between one end of resistor R7 and ground. Capacitor C4 is electrically connected between the other end of resistor R7 and ground. Understandably, capacitor C3 and resistor R6 work together to filter the lower frequency portion of the amplified signal. Capacitor C4 and resistor R7 work together to filter the higher frequency portion of the amplified signal, thereby enabling control module 70 to obtain a more ideal frequency input range and allowing control module 70 to more accurately identify the amplified signal corresponding to the frequency band of infrared signal S1.

[0049] For example, the control module 70 is a microcontroller. Understandably, the control module 70 has an analog input terminal electrically connected to the output of the bandpass filter module 60 to receive the noise-reducing signal. More specifically, the analog input terminal is electrically connected to the other end of resistor R7.

[0050] For example, the control module 70 may also be a hardware circuit structure capable of outputting received strength information based on the denoised signal.

[0051] Optionally, the indicating module 80 includes a light-emitting element. Understandably, the indicating module 80 uses light to represent the received intensity of the indicating infrared signal S1. Exemplarily, the light-emitting element is a plurality of LED elements, with a larger number of LED elements in the lit state when the received intensity of the infrared signal S1 is high, and a smaller number of LED elements in the lit state when the received intensity of the infrared signal S1 is low.

[0052] For example, the light-emitting element is a digital tube. Understandably, the value displayed by the indicator module 80 through the digital tube represents the received intensity of the infrared signal S1.

[0053] In some other embodiments, the indicator module 80 includes a display screen. That is, the indicator module 80 uses patterns or characters displayed on the display screen to represent the received strength of the infrared signal S1.

[0054] In some embodiments, the indicating module 80 includes a sound-emitting element. Optionally, the indicating module 80 represents the received strength of the infrared signal S1 by the intensity of the sound. Understandably, the indicating module 80 represents the received strength of the infrared signal S1 by the frequency of the sound. Exemplarily, the sound-emitting element is a loudspeaker.

[0055] Optionally, light-emitting components and sound-emitting components.

[0056] The above embodiments are merely preferred embodiments of this application and are not intended to limit the scope of this application. Any modifications and improvements made by those skilled in the art to the technical solutions of this application without departing from the spirit of this application should fall within the protection scope defined by the claims of this application.

Claims

1. An infrared grating with signal strength indication function, characterized in that, include: A photosensitive module is used to receive infrared signals and output an initial signal associated with the intensity of the infrared signals; An amplification module, electrically connected to the photosensitive module, is used to amplify the initial signal into an amplified signal; A bandpass filter module is electrically connected to the amplification module and is used to filter the amplified signal into a denoised signal; The control module is electrically connected to the bandpass filter module and outputs received strength information associated with the strength of the denoised signal; when the strength of the denoised signal is lower than a preset threshold, the control module outputs an alarm drive signal. and An indication module is used to receive reception strength information output by the control module, has at least two indication states, and switches between the at least two indication states according to changes in the reception strength information.

2. The infrared grating with signal strength indication function according to claim 1, characterized in that, The photosensitive module includes a photodiode RD1 and a resistor R1; the anode of the photodiode RD1 is electrically connected to one end of the resistor R1, and the anode of the photodiode RD1 is electrically connected to the input terminal of the amplification module; the cathode of the photodiode RD1 is used to electrically connect to a reference voltage point; the other end of the resistor R1 is used to ground.

3. The infrared grating with signal strength indication function according to claim 2, characterized in that, The photosensitive module also includes a capacitor C1 and a resistor R2; the capacitor C1 is electrically connected between the anode of the photodiode RD1 and the input terminal of the amplification module; one end of the resistor R2 is electrically connected to the input terminal of the amplification module, and the other end is used for grounding.

4. The infrared grating with signal strength indication function according to claim 1, characterized in that, The amplification module includes at least two amplification units; the at least two amplification units are connected in series between the photosensitive module and the bandpass filter module.

5. The infrared grating with signal strength indication function according to claim 4, characterized in that, The amplification module also includes a capacitor C2 and a resistor R5; the capacitor C2 is electrically connected between the output terminal of one amplification unit and the input terminal of another amplification unit; one end of the resistor R5 is electrically connected to the input terminal of the other amplification unit, and the other end is used for grounding.

6. The infrared grating with signal strength indication function according to claim 4, characterized in that, One of the amplification units includes an operational amplifier U1B, resistors R3 and R13; the non-inverting input of the operational amplifier U1B is electrically connected to the output of the photosensitive module; resistors R3 and R13 are connected in series between the output of the operational amplifier U1B and ground; the connection point between resistors R3 and R13 is electrically connected to the inverting input of the operational amplifier U1B; the output of the operational amplifier U1B is electrically connected to another amplification unit.

7. The infrared grating with signal strength indication function according to claim 1, characterized in that, The bandpass filter module includes capacitor C3, capacitor C4, resistor R6, and resistor R7; one end of capacitor C3 is electrically connected to the output terminal of the amplification module, and the other end is electrically connected to one end of resistor R7; the other end of one end of resistor R7 is electrically connected to the input terminal of the control module; resistor R6 is electrically connected between one end of resistor R7 and ground; and capacitor C4 is electrically connected between the other end of resistor R7 and ground.

8. The infrared grating with signal strength indication function according to claim 1, characterized in that, The indicator module includes a light-emitting element.

9. The infrared grating with signal strength indication function according to claim 1, characterized in that, The indicator module includes a sound-emitting element.

10. The infrared grating with signal strength indication function according to claim 9, characterized in that, It also includes a slave module; in operation, the slave module is used to send infrared signals to the photosensitive module.

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