TW202244532A - Laser jammer and detection method thereof - Google Patents

Abstract

A laser jammer and detection method thereof are provided, the laser jammer including: an optical receiver; an optical transmitter; a processing unit; wherein the processing unit drives the optical transmitter to transmit a test laser beam when the laser jammer is in turn-on state, and the processing unit determines the functional status of the laser jammer according to a state of receiving of the test laser beam.

Description

Laser jammer and detection method thereof

The invention relates to a laser jammer and a detection method thereof.

The principle of laser detection is to use laser light of a specific wavelength and a specific emission signal frequency to the object to be detected, and receive the laser light reflected by the object to detect the object to be detected.

Conventional laser jammers generally cover the reflected laser light by continuously emitting a disturbing laser light after receiving the laser light from the detector. However, such conventional technologies have not further analyzed and compared the properties of the laser light of the detector, such as the wavelength, signal emission frequency, and amplitude, and the effect is poor.

In addition, generally known laser jammers do not have a self-test function, so in actual operation, it is impossible to predict whether the laser jammer can operate normally, and it may continue to be used without any effect, losing the effect of laser jamming.

Therefore, it is necessary to provide a novel and progressive laser jammer and its detection method to solve the above problems.

The main purpose of the present invention is to provide a laser jammer and its detection method, which can effectively detect the functional state.

To achieve the above object, the present invention provides a laser jammer, comprising: an optical receiver; an optical transmitter; a processing unit; wherein, the processing unit drives the optical transmitter when the laser jammer is in an activated state A test laser light is generated, and the processing unit judges the functional state of the laser jammer according to the state of the light receiver receiving the test laser light.

In order to achieve the above object, the present invention further provides a detection method of a laser jammer, comprising the following steps: starting the laser jammer; a processing unit of the laser jammer drives the laser jammer when the laser jammer is in the activated state The light transmitter generates a test laser light, and the processing unit judges the function status of the laser jammer according to the state of the test laser light received by the light receiver of the laser jammer.

The following examples illustrate possible implementations of the present invention, but are not intended to limit the scope of protection of the present invention.

Please refer to FIGS. 1 to 6 , which show a preferred embodiment of the present invention. The laser jammer 1 of the present invention includes an optical receiver 10 , an optical transmitter 20 and a processing unit 30 .

The optical receiver is capable of receiving an incident laser light including at least one incident pulse wave and generating an incident light signal associated with the at least one incident pulse wave; the processing unit can drive the light transmitter to generate according to the incident light signal A test laser light including at least one test pulse. In this embodiment, the optical receiver 10 is configured to receive an incident laser light 40 including a complex number of incident pulse waves 41 and generate an incident light signal 11 associated with the complex number of incident pulse waves 41 . The processing unit 30 calculates the interval time T between adjacent two of the complex incident pulse waves 41 according to the incident light signal 11, and drives the light emitter 20 to generate an interfering laser light 21, the interfering laser light 21 includes complex The interference pulse wave 22, the plurality of the interference pulse waves 22 are intermittently emitted in the interval time T between the plurality of the incident pulse waves 41 with a first time interval T1 and each continues to overlap at least one of the incident pulse waves 41, wherein, The processing unit 30 drives the optical transmitter 20 to generate a test laser light including a plurality of test pulse waves when the laser jammer 1 is in the activated state, and the processing unit 30 receives the test laser light according to the light receiver 10. The state of the pulse wave is used to judge the functional state of the laser jammer 1 . The start-up in the present invention can be the open state at any time, as long as the laser jammer 1 is powered and can be activated. Wherein, the incident pulse wave 41 and the interference pulse wave 22 respectively include complex laser pulse waves. In this embodiment, the test laser light can be the same as the interfering laser light 21, having the same light wavelength, signal emission frequency, amplitude and other properties; however, the test laser light can be set to have other light wavelengths, signal emission frequencies , amplitude and other properties. In this way, the functional state can be effectively detected, and the use of the laser jammer 1 in an invalid state can be avoided.

In addition, preferably, a subsequent interference pulse wave 22 a is transmitted at a time interval T2 different from the first time interval T1 relative to the previous interference pulse wave 22 . It should be noted that the subsequent interfering pulse wave 22a can be the incident pulse wave below the previous plural number of the incident pulse waves 41 , or it can be the next incident pulse wave after the previous plural number of the incident pulse waves 41 . In this way, the laser detector that emits the incident laser light 40 can be disturbed, and the incident state of the incident laser light 40 (continuous, intermittent or stopped) can be judged during the disturbance process.

The emission signal frequency of the interfering laser light 21 is the same as the emission signal frequency of the incident laser light 40, and the first time interval T1 is the same as the time length of the interval time T, so as to ensure synchronous interference with the laser detector receiving reflected incident laser light. The amplitude of the interference pulse wave 22 is preferably larger than the amplitude of the incident pulse wave 41 so as to effectively cover the incident pulse wave 41 . Each of the interference pulse waves 22 continues to overlap more than 1/2 of one of the incident pulse waves 41, preferably overlaps more than 3/4, or even completely overlaps, so as to completely block and interfere with the laser detector receiving reflection of incident laser light. Preferably, the number of the complex incident pulse waves 41 is at least three, and the interfering laser light 21 is emitted relatively after the first three incident pulse waves 41 to determine the light wavelength of the received incident pulse waves 41 , signal transmission frequency, amplitude and other properties, the incident laser is indeed the target of the desired interference, avoiding misjudgment and unnecessary emission of the interfering laser light 21 by the optical transmitter 20, accurate and energy-saving.

In this embodiment, the subsequent one of the disturbance pulses 22 a is transmitted at a time interval T2 greater than the first time interval T1 relative to the previous disturbance pulse 22 . For example but not limited to, after an interval of the incident pulse wave 41 (or a plurality of incident pulse waves 41), the interfering pulse wave is intermittently emitted at the first time interval, so that it can be based on whether there is a pulse wave in the time interval T2 The incident state of the incident laser light 40 is judged upon receiving the incident pulse wave 41 . Wherein, if the incident pulse wave 41 is received within the time interval T2, then continue to emit the interfering laser light 21; if the incident pulse wave 41 is not received within the time interval T2 (for example, the incident pulse wave 41 stops emission), then the interfering laser light 21 will not be emitted. In addition, the time interval T2 can also be used to evaluate whether the emission timing of the interfering laser light 21 is offset or inaccurate, and can also be used to precisely adjust the emission timing of the interfering laser light 21 . In other present embodiments, the subsequent one of the interference pulse wave 22b is transmitted at a time interval T3 greater than the first time interval T1 relative to the previous interference pulse wave 22, and the subsequent one of the interference pulse wave 22b (which can be obtained by modulation of the interference pulse wave 22, or an interference pulse wave generated independently, which can be regarded as a test pulse wave (which may not be calculated based on the incident light signal)) can be located at a Within the duration range of the incident pulse wave 41 (as shown in FIG. 7 ), it also has the function of judging the incident state of the incident laser light 40 and precisely adjusting the emission time point of the interfering laser light 21 accordingly.

In detail, the photoreceiver 10 includes at least one photodiode 12, the photodiode 12 has a light receiving angle between 40 degrees and 80 degrees, and a plurality of photodiodes 12 are preferably provided to improve The receiving range of the optical receiver 10 is not missed. The light emitter 20 includes at least one laser diode 23. The laser diode 23 has a light emission angle between 15° and 45°, so that the interfering laser light 21 is concentrated in a more effective light emission range as much as possible. inside, which contributes to the interference effect. The number of the at least one laser diode 23 can be plural, and can include laser diodes capable of emitting different wavelengths. The wavelengths of the interfering laser light 21, the test laser light and the incident laser light 40 are between 850 nm and 910 nm, and the frequency of the emission signal is between 100 Hz and 600 Hz. The wavelength range used by common laser detectors can actually be different according to different needs, and even the laser jammer 1 can also be provided with a transmission signal frequency adjustment circuit to adjust the interference laser light 21 and/or the Test the emission signal frequency of laser light.

The processing unit 30 includes a first-stage amplifier 31 communicating with the optical receiver 10, a second-stage amplifier 32 communicating with the first-stage amplifier 31, a processor 33 communicating with the second-stage amplifier 32, The processor 33 communicates with the optical transmitter 20, the first stage amplifier 31 processes the incident light signal 11 into an amplified signal 11a, and the second stage amplifier 32 processes the amplified signal 11a into an amplified signal 11b, the processor 33 according to The amplified signal 11 b is separated by a time T, and is driven by a driving circuit 34 to drive the light emitter 20 to generate the interfering laser light 21 . The first-stage amplifier 31 is a transistor amplifier, which can amplify the original waveform signal, and the second-stage amplifier 32 is preferably a video amplifier, which can further amplify and convert the amplified signal 11a processed and amplified by the transistor amplifier into a square wave pattern. The processing unit 30 further includes a comparator 35 connected between the video amplifier and the processor 33, the comparator 35 is provided with a threshold, and the comparator 35 only allows the amplified signal 11b processed by the video amplifier to be greater than The peak portion 11c of the threshold passes through, and the interval time T is spaced between adjacent two of the peak portions 11c. The amplified signal 11a is processed into a square wave form by the video amplifier, which can facilitate the processor 33 to digitize and filter out other noises (possibly from different noises in the environment) that are not desired by the comparator 35. Light), can increase processing speed and judge the correctness of signal source, and reduce the load of this processor 33. Of course, both the first-stage amplifier 31 and the second-stage amplifier 32 can also be transistor amplifiers, as long as the processor 33 has sufficient data processing capability. The threshold value can be set as the voltage value, current value or amplitude value of the amplified signal 11b, for example, the threshold value is set as the voltage value of the amplified signal 11b, and the voltage value is set as 2 volts (V), for example. The laser jammer 1 can also be further provided with a threshold adjustment or switching circuit to adjust the threshold according to different needs, or switch and set the threshold to any one of voltage value, current value and amplitude value. The communications mentioned above generally refer to wired or wireless methods.

The first-stage amplifier 31, the second-stage amplifier 32, the comparator 35, and the circuit 36 electrically connected therebetween are preferably shielded by a metal cover 37, which can reduce external signals, electromagnetic waves and the laser interference Interference with other circuits of the optical device 1 (such as the optical transmitter 20 and the circuits connected thereto) ensures that the signal received by the optical receiver 10 is free from interference and distortion, and improves the accuracy of signal judgment. Wherein, the circuit 36 is arranged on a circuit board 38, and preferably a metal cover 37 is provided on opposite sides of the circuit board 38, and there is a gap 39 between the metal cover 37 and the circuit board 38, The gap 39 , for example, straddles the portion of the circuit 36 connected between the optical receiver 10 and the optical transmitter 20 to prevent the metal cover 37 from interfering or causing a short circuit.

Preferably, a filter lens 50 is additionally provided in front of the light receiver 10. For example, the filter lens 50 only allows 700 nm to 950 nm (preferably and limited to between 700 nm and 900 nm) The filter lens 50 is preferably made of plastic material, which has good light transmittance, is strong and not brittle, and is cheap. The filter lens 50 first filters unnecessary wavelengths to a certain extent, so as to reduce the data processing load of the processing unit 30, increase the processing speed and determine the accuracy of the signal source. Preferably, if only laser light of a specific wavelength is accurately allowed to pass through the filter lens 50, the light emitter 20 can be driven to generate the interference even after receiving the incident pulse wave 41 of the two incident laser lights 40 Laser light 21, the interference is faster and more accurate.

The laser jammer 1 preferably further includes a plastic or metal casing 60 to protect its internal components. The housing 60 is provided with an external structure 61 for installation. The external structure 61 is, for example, a screw hole, a buckle, a magnetic element, or any mechanism that can be relatively fixedly connected to a corresponding installation component.

The present invention further provides a detection method of a laser jammer, which can be implemented through the above-mentioned laser jammer 1 . Please cooperate with reference to Fig. 1-4 and Fig. 4a, the detection method of this laser jammer comprises the following steps: (S1): start this laser jammer 1, wherein this laser jammer is for receiving a complex incident pulse wave 41 the incident laser light 40 and generate an incident light signal 11 associated with the complex incident pulse wave 41; (S2): the laser jammer 1 can calculate the adjacent of the complex incident pulse wave 41 according to the incident light signal 11 The interval between the two is T, and the light emitter 20 is driven to generate a disturbing laser light 21, wherein the processing unit 30 drives the light emitter 20 to generate a complex number when the laser disruptor 1 is in the activated state. The test laser light of the test pulse wave; (S3): the processing unit 30 judges the functional state of the laser jammer 1 according to the state of the test pulse wave of the test laser light received by the optical receiver 10.

For example, it generates the test laser light with the same frequency as the emission signal of the interference laser light 21, and controls the plurality of laser diodes 23 of the light emitter 20 to emit the test laser light respectively. Preferably, it is to control the plurality of laser diodes 23 of the light transmitter 20 to emit the test laser light respectively, and respectively set a specified one of the plurality of photodiodes 12 of the light receiver 10 to receive the test Laser light, such as numbering the plurality of laser diodes 23 and the plurality of photodiodes 12, the test laser light emitted by a certain number of laser diodes 23 is designated by a certain number of photodiodes 12 receiving, so that each of the laser diodes 23 has carried out emission detection, and each of the photodiodes 12 has also carried out reception detection, except that it can be judged whether the functional state of the laser jammer 1 is normal, and It is beneficial to quickly and accurately determine the abnormal component. Wherein, when the photodiode 12 receives the test laser light normally, the processing unit 30 judges that the functional state of the laser jammer 1 is normal; when the photodiode 12 does not receive the test laser light or/and If the laser diode 23 does not emit laser light, the processing unit 30 judges that the functional state of the laser jammer 1 is abnormal.

In addition, preferably, a subsequent interference pulse wave 22 a is transmitted at a time interval T2 different from the first time interval T1 relative to the previous interference pulse wave 22 . Wherein, after the subsequent one of the interference pulse waves 22a, the plurality of the interference pulse waves 22 can be controlled to be intermittently emitted within the interval time T between the plurality of the incident pulse waves 41 at the first time interval T1 and each lasts to overlap one of the incident pulse waves 41 to continue to interfere with the incident laser light 40 .

Wherein, the subsequent one of the interference pulse wave 22a can be controlled to be transmitted at a time interval T2 greater than the first time interval T1 relative to the previous interference pulse wave 22 (as shown in FIG. 6 ), or the subsequent one can be controlled The duration of the interference pulse wave 22b is within the range of the duration of the incident pulse wave 41 (as shown in FIG. 7 ), and the incident state of the incident laser light 40 can be judged during the interference process.

Wherein, the opening and closing of the laser jammer 1, and the state of the laser jammer 1, such as but not limited to the normal/abnormal state of the function of the laser jammer 1, the data status of receiving the incident laser light 40 (distance , frequency band, position, time, etc.), obtained motion status (such as the speed of the device installed in the laser jammer 1), can be transmitted via wired transmission (as shown in Figure 4) or/and wireless transmission (as shown in Figure 4b) It communicates with a prompting device 70, and the prompting device 70 sends out corresponding prompts (audio, light, and vibration) for prompting, notification, and warning. The prompting device 70 can be arranged inside or outside a device, or can be a device that can communicate with the laser jammer 1 remotely.

It should be noted that, in the above embodiment, the interference pulse wave 22, 22a, 22b can be transmitted earlier than the incident pulse wave 41 within the interval time T and overlap with one or more of the incident pulse wave 41; or, The interference pulse wave 22, 22a, 22b may be emitted later than the incident pulse wave 41 within the interval time T and overlap with one or more of the incident pulse wave 41; or, the interference pulse wave 22, 22a, 22b may Simultaneously, the incident pulse wave 41 is emitted and overlapped with one or more incident pulse waves 41 . Wherein, the above-mentioned overlapping can be partially or completely overlapping; the end time points of the interference pulse wave 22, 22a, 22b and the incident pulse wave 41 can be at the same time or not.

1: Laser jammer 10: Optical receiver 11: Incident light signal 11a, 11b: amplified signal 11c: peak part 12: Photodiode 20: Optical transmitter 21: Interfering with laser light 22, 22a, 22b: Interference pulse wave 23:Laser diode 30: Processing unit 31: First stage amplifier 32: second stage amplifier 33: Processor 34: Drive circuit 35: Comparator 36: circuit 37: metal cover 38: circuit board 39: Gap 40: Incident laser light 41: Incident pulse wave 50: filter lens 60: shell 61: External structure 70: Prompt device S1~S3: steps T: interval time T1: first interval time T2: time interval T3: time interval

Fig. 1 is a perspective view of a preferred embodiment of the present invention. Fig. 2 is an exploded view of a preferred embodiment of the present invention. Fig. 3 is a sectional view of a preferred embodiment of the present invention. Fig. 4 is a block diagram of the structural relationship of a preferred embodiment of the present invention. Fig. 4a is a flowchart of a detection method of a laser jammer according to a preferred embodiment of the present invention. Fig. 4b is another structural relationship block diagram of a preferred embodiment of the present invention. FIG. 5 is a schematic diagram of signal processing in a preferred embodiment of the present invention. FIG. 6 is a schematic diagram of signal interference in a preferred embodiment of the present invention. FIG. 7 is another schematic diagram of signal interference in a preferred embodiment of the present invention.

1: Laser jammer

37: metal cover

50: filter lens

60: shell

61: External structure

Claims (10)

A laser jammer comprising: a light receiver; a light emitter; a processing unit; Wherein, the processing unit drives the light transmitter to generate a test laser light when the laser jammer is in the activated state, and the processing unit judges the function of the laser jammer according to the state of the light receiver receiving the test laser light state. The laser jammer as described in Claim 1, wherein the processing unit calculates the interval time between adjacent two of the plurality of incident pulse waves of the incident laser light according to the incident light signal of the incident laser light, and drives the light The emitter generates an interfering laser light, the interfering laser light includes a plurality of interfering pulses, the plurality of interfering pulses are intermittently emitted at intervals between the plurality of incident pulses at a first time interval and each continues until overlapping at least - the incident pulse wave. The laser jammer as claimed in claim 2, wherein the subsequent one of the interference pulses is transmitted at a time interval different from the first time interval relative to the previous interference pulse, and the subsequent one of the interference The pulse is transmitted at a time interval greater than the first time interval relative to the previous interference pulse. The laser jammer as claimed in claim 3, wherein the duration of the subsequent one of the interference pulses is within a duration range of the incident pulse. The laser jammer according to any one of claims 2 to 4, wherein the processing unit includes a first-stage amplifier in communication with the optical receiver, a second-stage amplifier in communication with the first-stage amplifier, A processor in communication with the second-stage amplifier, the processor in communication with the optical transmitter, the first-stage and second-stage amplifiers process the incident light signal into an amplified signal, the processor depends on the amplified signal interval time, And driving the light emitter to generate the interfering laser light. The laser jammer as described in claim 5, wherein the first-stage amplifier is a transistor amplifier, the second-stage amplifier is a video amplifier, and the processing unit further includes a communication link between the video amplifier and the processor A comparator, the comparator is provided with a threshold value, the comparator only allows the peak part of the amplified signal processed by the video amplifier to be greater than the threshold value to pass through, and the adjacent two of the peak parts are separated by the Intervals. A method for detecting a laser jammer, comprising the following steps: Activate the laser jammer; A processing unit of the laser jammer drives the light emitter to generate a test laser light when the laser jammer is in the activated state, and the processing unit receives the test laser light according to an optical receiver of the laser jammer Status, to judge the functional status of the laser jammer. The method for detecting a laser jammer as described in Claim 7, wherein the test laser light is generated at the same frequency as the emission signal of the interfering laser light. The method for detecting a laser jammer according to claim 7, wherein the plurality of laser diodes of the light transmitter are controlled to emit the test laser light respectively. The detection method of the laser jammer as described in Claim 7, wherein the plurality of laser diodes of the light transmitter are controlled to emit the test laser light respectively, and the plurality of photodiodes of the light receiver are respectively set The specified one receives the test laser light.

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