CN108132068B - Photoelectric reflection type sensor array - Google Patents
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- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/28—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication
- G01D5/30—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication the beams of light being detected by photocells
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Abstract
The invention discloses a photoelectric reflection type sensor array, comprising: the photoelectric reflection type sensors are placed at different positions and used for transmitting detection light to a detection object, receiving reflected light of the detection object and performing resonance demodulation on the reflected light to obtain resonance demodulation pulses; and the integrated controller is used for determining the maximum amplitude of each received resonance demodulation pulse when a target condition is triggered, determining the intensity of the generated emitted light intensity control signal according to the comparison result of the maximum amplitude with the first amplitude threshold and the second amplitude threshold, and sending the emitted light intensity control signal to each photoelectric reflective sensor so as to control the emission intensity of the detection light of each photoelectric reflective sensor. By applying the technical scheme provided by the embodiment of the invention, the photoelectric reflective sensors are controlled to detect the light emission intensity, the accuracy of each photoelectric reflective sensor is improved, and meanwhile, the photoelectric reflective sensors are uniformly adjusted to reduce the adjustment cost.
Description
Technical Field
The invention relates to the technical field of safety monitoring, in particular to a photoelectric reflection type sensor array.
Background
A large number of electric vehicles in rail transit use a pantograph to take power from an overhead dedicated power grid, and when the vehicles run, detection of a power grid motion range, detection of a pull-out value and the like are required, where the pull-out value refers to a distance from a center of a rail when the pantograph and the power grid are in contact at a positioning point. The non-contact sensor can avoid direct contact to meet the detection requirement, and when the non-contact sensor is placed specifically, the non-contact sensor is usually placed densely beside a track or a plurality of sensors close to a detected object are installed limitedly at part of key monitoring points.
These sensors, when operated, transmit optical signals to the detection object and recognize reflected light of the detection object. The emission intensity of the sensor determines the optimal recognition distance between the detection object and the sensor, and the distance between the sensor and the detection object is usually designed to be short, and the distance between the interfering object and the sensor is far shorter than the distance between the detection object and the sensor, so that when the sensor transmits an optical signal to the detection object with a certain emission intensity, the detection object can be accurately recognized. However, in practical applications, due to complex field conditions, the emission intensity of the sensor is still not appropriate, specifically, when the emission intensity is too high, reflected light of an interfering object such as a subway hanger or a tunnel roof reflection, which is farther away, can be identified, and accordingly, the emission intensity of an optical signal of the sensor is lower, and the condition that a detection object cannot be detected can affect the accuracy of identification performed by the sensor. Moreover, the distance between the detection object and the sensor may change constantly, for example, when the carbon brush of the pantograph is worn, the distance between each sensor and the power grid changes synchronously, which may also affect the accuracy of the identification of the sensor. In addition, the number of sensors is large, and the requirements on the volume and the cost of each sensor are high due to the independent adjustment, so that the uniform adjustment is needed.
In summary, how to improve the accuracy of the identification of the sensor array is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a photoelectric reflection type sensor array, which is used for controlling the detection light emission intensity of each photoelectric reflection type sensor, improving the accuracy of each photoelectric reflection type sensor, and simultaneously uniformly adjusting each photoelectric reflection type sensor, thereby reducing the adjustment cost.
In order to solve the technical problems, the invention provides the following technical scheme:
an electro-optical reflective sensor array, comprising:
the photoelectric reflection type sensors are placed at different positions and used for transmitting detection light to a detection object, receiving reflected light of the detection object and performing resonance demodulation on the reflected light to obtain resonance demodulation pulses;
the integrated controller is used for determining the maximum amplitude of each received resonance demodulation pulse when a target condition is triggered, generating a transmission light intensity control signal for reducing the transmission intensity of the detection light of each photoelectric reflective sensor when the maximum amplitude exceeds a first amplitude threshold, and sending the transmission light intensity control signal to each photoelectric reflective sensor; when the maximum amplitude is lower than a second amplitude threshold, generating the emission light intensity control signal for increasing the emission intensity of the detection light of each photoelectric reflective sensor, and sending the emission light intensity control signal to each photoelectric reflective sensor;
the target condition is that the centralized controller receives the resonance demodulation pulse sent by the same photoelectric reflection sensor twice, and the second amplitude threshold is smaller than or equal to the first amplitude threshold.
Preferably, each of the photoelectric reflective sensors includes:
the pulse light emitting module is used for sending pulse light to a detection object and receiving the emitted light intensity control signal sent by the centralized controller;
the resonance filtering module is used for receiving the reflected light of the detection object and performing resonance filtering on the reflected light to obtain a resonance filtering signal;
and the demodulation module is used for receiving the resonance filtering signal and demodulating the resonance filtering signal to obtain resonance demodulation pulse.
Preferably, the resonance filtering module includes:
the parallel resonance type photoelectric receiver is used for receiving the reflected light of the detection object based on the same frequency as the emitted light intensity control signal and carrying out resonance amplification on the reflected light to obtain a photoelectric output signal;
and the resonance filter is used for receiving the photoelectric output signal and performing resonance filtering to obtain a resonance filtering signal.
Preferably, the demodulation module includes:
a detector for determining a detection value of the resonance filtered signal received and generating a detection signal;
a demodulation filter for receiving and demodulating the detection signal to generate a demodulation pulse signal;
and the sensitivity normalization regulator is used for receiving the demodulation pulse signal and carrying out amplitude regulation to obtain the resonance demodulation pulse.
Preferably, the centralized controller includes:
the adder is used for receiving each resonance demodulation pulse, generating a multi-set result signal containing each resonance demodulation pulse and sending the multi-set result signal to the peak detector;
the peak detector is used for performing peak detection on the received multi-set result signal to determine the maximum amplitude of each resonance demodulation pulse, generating a set peak signal carrying the maximum amplitude and sending the set peak signal to the transmitted light intensity controller;
the emission light intensity controller is configured to determine an emission light intensity control signal with a corresponding intensity according to the magnitude of the maximum amplitude of the aggregate peak signal, wherein when the maximum amplitude exceeds a first amplitude threshold, an emission light intensity control signal for reducing the emission intensity of the detection light of each of the photoelectric reflective sensors is generated, and the emission light intensity control signal is sent to each of the photoelectric reflective sensors; and when the maximum amplitude is lower than a second amplitude threshold value, generating the emission light intensity control signal for increasing the emission intensity of the detection light of each photoelectric reflective sensor, and sending the emission light intensity control signal to each photoelectric reflective sensor.
Preferably, the centralized controller further includes an object identifier, configured to perform quantization detection on each received resonance demodulation pulse according to a preset quantization threshold, and output each object identification signal corresponding to each resonance demodulation pulse one to one.
Preferably, the photoelectric reflective sensor array further includes a first interference suppressor for receiving each of the object identification signals, and when the number of outputs of each of the object identification signals at a certain time is greater than 1, each of the object identification signals at the certain time is determined as an interference signal.
Preferably, the photoelectric reflective sensor array further includes a second interference suppressor for receiving each of the object identification signals, and determining that the two object identification signals are non-interference signals when the detection object is determined to be a dual-cable partially parallel structure and only two of the object identification signals are output at a certain time.
Preferably, the centralized controller further includes an aggregation discriminator, configured to receive the multiple aggregation result signals, perform quantization detection on the multiple aggregation result signals according to the quantization threshold, and output an aggregation identification signal.
Preferably, the set identifier further comprises a reference voltage unit for providing a reference voltage to the adder, the peak detector and the emitted light intensity controller.
By applying the technical scheme provided by the embodiment of the invention, the photoelectric reflection type sensor array comprises: the photoelectric reflection type sensors are placed at different positions and used for transmitting detection light to a detection object, receiving reflected light of the detection object and performing resonance demodulation on the reflected light to obtain resonance demodulation pulses; the integrated controller is used for determining the maximum amplitude of each received resonance demodulation pulse when a target condition is triggered, generating a transmission light intensity control signal for reducing the transmission intensity of the detection light of each photoelectric reflective sensor when the maximum amplitude exceeds a first amplitude threshold, and sending the transmission light intensity control signal to each photoelectric reflective sensor; when the maximum amplitude is lower than a second amplitude threshold value, generating a transmission light intensity control signal for improving the transmission intensity of the detection light of each photoelectric reflective sensor, and sending the transmission light intensity control signal to each photoelectric reflective sensor; the target condition is that the integrated controller receives two resonance demodulation pulses sent by the same photoelectric reflection type sensor, and the second amplitude threshold value is smaller than or equal to the first amplitude threshold value.
Due to the scheme of the invention, the integrated controller is used for receiving the resonance demodulation pulses sent by each photoelectric reflection type sensor, determining the maximum amplitude of each resonance demodulation pulse, and determining the emission light intensity control signal with corresponding intensity according to the comparison result of the maximum amplitude and the first threshold and the second threshold. After the emitted light intensity control signal is sent to each photoelectric reflective sensor, the intensity of the emitted light intensity control signal determines the emission intensity of the detection light of each photoelectric reflective sensor. That is, the emission intensity of the detection light is determined according to the amplitude of the resonance demodulation pulse output by each photoelectric reflective sensor, and the gain adjustment is realized for each photoelectric reflective sensor by the centralized controller, that is, the emission intensity of each photoelectric reflective sensor can be adjusted. And because the integrated controller sends the control signal of the intensity of the emitted light to each photoelectric reflective sensor at the same time, the unified adjustment of each photoelectric reflective sensor is realized.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a photoreflective sensor array according to the present invention;
FIG. 2 is a schematic structural diagram of a photoreflective sensor in accordance with one embodiment of the present invention;
FIG. 3 is a circuit diagram of an embodiment of an array of photoelectric reflective sensors according to the present invention;
FIG. 4 is a schematic structural diagram of a centralized controller according to an embodiment of the present invention;
FIG. 5 is a simulation diagram of the correct output detection object information for interference identification and suppression in accordance with one embodiment of the present invention;
FIG. 6 is a simulation diagram illustrating suppression of synchronous interference according to an embodiment of the present invention;
fig. 7 is a schematic diagram of the output after suppressing and eliminating interference according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a photoelectric reflection type sensor array, which improves the accuracy of each photoelectric reflection type sensor by controlling the detection light emission intensity of each photoelectric reflection type sensor, avoids interference, and simultaneously carries out unified adjustment on each photoelectric reflection type sensor, thereby reducing the adjustment cost.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
Referring to fig. 1, a schematic structural diagram of a photoelectric reflective sensor array according to the present invention is shown, the sensor array including:
the plurality of photoelectric reflective sensors 100 placed at different positions transmit detection light to a detection target, receive reflected light from the detection target, and perform resonance demodulation on the reflected light to obtain resonance demodulation pulses.
It should be noted that fig. 1 shows 3 photoelectric reflective sensors 100, and in practical applications, the number of the photoelectric reflective sensors 100 and the placement position of each photoelectric reflective sensor 100 may be set according to actual situations, and usually, after each photoelectric reflective sensor 100 is installed, each photoelectric reflective sensor 100 may sequentially detect a detection object when detecting the detection object. The detection object is usually a power grid line.
For convenience of description, the sensor No. 1 is not illustrated in the present application, and the sensor No. 1 may be any one of the photoreflective sensors 100 in the photoreflective sensor array. The sensor No. 1 can transmit detection light, which may be a light pulse in general, to a detection object. The detection object reflects the light pulse, and the No. 1 sensor can receive the reflected light of the detection object. After receiving the reflected light of the detection target, the No. 1 sensor performs resonance demodulation on the reflected light to obtain a resonance demodulation pulse. The sensor No. 1 may send the resonance pulse to the centralized controller 200, and of course, each of the other sensors may also send the resonance demodulation pulse obtained by each sensor to the centralized controller 200 in sequence, and usually, only one photoelectric reflective sensor 100 detects the detection object at the same time and obtains the corresponding resonance demodulation pulse.
The integrated controller 200 is configured to determine a maximum amplitude of each received resonance demodulation pulse when a target condition is triggered, generate a transmission light intensity control signal for reducing the transmission intensity of the detection light of each photoelectric reflective sensor 100 when the maximum amplitude exceeds a first amplitude threshold, and send the transmission light intensity control signal to each photoelectric reflective sensor 100; when the maximum amplitude is lower than the second amplitude threshold, generating a transmission light intensity control signal for increasing the transmission intensity of the detection light of each of the photoelectric reflective sensors 100, and transmitting the transmission light intensity control signal to each of the photoelectric reflective sensors 100; the target condition is that the integrated controller 200 receives two resonance demodulation pulses sent by the same photoelectric reflective sensor 100, and the second amplitude threshold is smaller than or equal to the first amplitude threshold.
When a target condition is triggered, the centralized controller 200 may determine the maximum amplitude of each resonant demodulation pulse that it receives. The target condition refers to the centralized controller 200 receiving twice the resonance demodulation pulses sent by the same photo-reflective sensor 100. Taking sensor nos. 1 to 5 as an example, sensor No. 1 sends one resonance demodulation pulse to the centralized controller 200, and then sensor nos. 2 to 5 send respective resonance demodulation pulses in sequence, that is, there are 5 resonance demodulation pulses in total. When the resonance demodulation pulse sent by sensor No. 1 is received again, it is considered as a target condition trigger, and the centralized controller 200 determines the maximum amplitude of the received 5 resonance demodulation pulses.
After the maximum amplitude is determined, the maximum amplitude is compared with the first amplitude threshold and the second amplitude threshold to obtain the emission light intensity control signals with corresponding intensities, and after the emission light intensity control signals with different intensities are sent to each photoelectric reflective sensor 100, the emission intensity of each photoelectric reflective sensor 100 can be adjusted.
Specifically, when the maximum amplitude exceeds the first amplitude threshold, the centralized controller 200 may generate a transmission light intensity control signal for reducing the transmission intensity of the detection light of each of the photoelectric reflective sensors 100, and transmit the transmission light intensity control signal to each of the photoelectric reflective sensors 100. When the maximum amplitude exceeds the first amplitude threshold, which indicates that the detected light emission intensity of each of the photo-reflective sensors 100 in the photo-reflective sensor array is higher, the centralized controller 200 may decrease the intensity of the emitted light intensity control signal generated by the controller, for example, by decreasing the duty cycle of the emitted light intensity control signal so as to decrease the intensity of the emitted light intensity control signal, and after the intensity of the emitted light intensity control signal is decreased, the controller may send the signal to each of the photo-reflective sensors 100 so as to decrease the emission intensity of the detected light of each of the photo-reflective sensors 100.
Accordingly, when the maximum amplitude is lower than the second amplitude threshold, the centralized controller 200 may generate an emission light intensity control signal for increasing the emission intensity of the detection light of each of the photo-reflective sensors 100, and transmit the emission light intensity control signal to each of the photo-reflective sensors 100.
It should be noted that when the maximum amplitude exceeds the first amplitude threshold, that is, the intensity of the detected light emission of each of the photoreflective sensors 100 is high and needs to be reduced, there is usually a case where an interference signal is detected, for example, due to the high intensity of the detected light emission, at the top of the tunnel. When the maximum amplitude is lower than the second amplitude threshold, there is a case where the emission intensity of the detection light is low and the detection object cannot be detected, and therefore it is necessary to increase the emission intensity of the detection light.
The second amplitude threshold is less than or equal to the first amplitude threshold, when the second amplitude threshold is equal to the first amplitude threshold, the emission intensity of the detection light is controlled by taking one threshold as a standard, and both the first amplitude threshold and the second amplitude threshold can be set and adjusted according to actual conditions without affecting the implementation of the invention.
By applying the technical scheme provided by the embodiment of the invention, the photoelectric reflection type sensor array comprises: the photoelectric reflection type sensors are placed at different positions and used for transmitting detection light to a detection object, receiving reflected light of the detection object and performing resonance demodulation on the reflected light to obtain resonance demodulation pulses; the integrated controller is used for determining the maximum amplitude of each received resonance demodulation pulse when a target condition is triggered, generating a transmission light intensity control signal for reducing the transmission intensity of the detection light of each photoelectric reflective sensor when the maximum amplitude exceeds a first amplitude threshold, and sending the transmission light intensity control signal to each photoelectric reflective sensor; when the maximum amplitude is lower than a second amplitude threshold value, generating a transmission light intensity control signal for improving the transmission intensity of the detection light of each photoelectric reflective sensor, and sending the transmission light intensity control signal to each photoelectric reflective sensor; the target condition is that the integrated controller receives two resonance demodulation pulses sent by the same photoelectric reflection type sensor, and the second amplitude threshold value is smaller than or equal to the first amplitude threshold value.
Due to the scheme of the invention, the integrated controller is used for receiving the resonance demodulation pulses sent by each photoelectric reflection type sensor, determining the maximum amplitude of each resonance demodulation pulse, and determining the emission light intensity control signal with corresponding intensity according to the comparison result of the maximum amplitude and the first threshold and the second threshold. After the emitted light intensity control signal is sent to each photoelectric reflective sensor, the intensity of the emitted light intensity control signal determines the emission intensity of the detection light of each photoelectric reflective sensor. That is, the emission intensity of the detection light is determined according to the amplitude of the resonance demodulation pulse output by each photoelectric reflective sensor, and the gain adjustment is realized for each photoelectric reflective sensor by the centralized controller, that is, the emission intensity of each photoelectric reflective sensor can be adjusted. And because the integrated controller sends the control signal of the intensity of the emitted light to each photoelectric reflective sensor at the same time, the unified adjustment of each photoelectric reflective sensor is realized.
In one embodiment of the present invention, the photoelectric reflective sensor 100 may include:
and a pulsed light emitting module for sending pulsed light to the detection object and collecting the emitted light intensity control signal sent by the controller 200.
The detection light transmitted by each of the photo-reflective sensors 100 to the detection object may be pulsed light, the frequency of the pulsed light may be set and adjusted according to actual conditions, and the pulse light emitting module may be used to transmit the pulsed light and receive the emission light intensity control signal transmitted by the centralized controller 200.
In a specific implementation, the pulsed light emitting module may be a pulsed light emitter 110, as shown in fig. 2, and the pulsed light emitter 110 transmits the detection light and receives the emission light intensity control signal. A circuit diagram of an embodiment of the pulsed light emitter 110 can be seen in fig. 3.
And the resonance filtering module is used for receiving the reflected light of the detection object and performing resonance filtering on the reflected light to obtain a resonance filtering signal.
After the pulsed light emitting module sends pulsed light to the detection object, the detection object reflects the pulsed light, and the resonance filtering module can be used for receiving reflected light of the detection object and performing resonance filtering on the reflected light to obtain a resonance filtering signal.
The resonance filtering module can send the generated resonance filtering signal to the demodulation module, and the demodulation module receives and demodulates the resonance filtering signal to obtain the resonance demodulation pulse.
In one embodiment of the present invention, the resonance filtering module may include:
a parallel resonance type photoelectric receiver 120 for receiving reflected light of the detection object based on the same frequency as the emitted light intensity control signal and performing resonance amplification on the reflected light to obtain a photoelectric output signal;
and the resonance filter 130 is used for receiving the photoelectric output signal and performing resonance filtering to obtain a resonance filtering signal.
Since the light received by the photoelectric reflective sensor 100 not only has the reflected light of the detection object, but also may have the interference of sunlight, light and other accidental light, the received reflected light can be subjected to resonance filtering, so as to overcome the interference of the light which cannot be solved by adopting same-frequency filtering in the prior art. In a specific implementation, the resonance filtering module may specifically include the following components shown in fig. 2: a resonant photo-receiver 120 and a resonant filter 130 are connected in parallel. The parallel resonance type photoelectric receiver 120 receives the reflected light of the detection object using the same frequency as the emitted light intensity control signal, and performs resonance amplification to obtain a photoelectric output signal. The parallel resonant photoelectric receiver 120 sends the photoelectric output signal to the resonant filter 130, and the resonant filter 130 performs resonant filtering on the photoelectric output signal, so that the anti-interference capability is further enhanced, and a resonant filtering signal is obtained. The parallel resonant photoelectric receiver 120 and the resonant filter 130 are implemented in a circuit as shown in fig. 3.
In one embodiment of the present invention, the demodulation module includes:
a detector 140 for determining a detected value of the received resonance filtered signal to generate a detected signal;
a demodulation filter 150 for receiving and demodulating the detection signal to generate a demodulation pulse signal;
and the sensitivity normalization regulator 160 is used for receiving the demodulation pulse signal and carrying out amplitude regulation to obtain the resonance demodulation pulse.
After obtaining the resonance filtering signal, it is necessary to demodulate the low frequency information carried on the high frequency carrier by using a demodulation module to obtain a resonance demodulation pulse. In one embodiment of the present invention, and with reference to FIG. 2, an input of detector 140 may be coupled to an output of resonant filter 130 to receive the resonance filtered signal and determine a detected value, e.g., an absolute value, of the resonance filtered signal to generate a detected signal. The input of the demodulation filter 150 may be connected to the output of the detector 140, and receives the detected signal, demodulates the detected signal, and generates a demodulated pulse signal. The sensitivity normalization adjuster 160 may receive the demodulated pulse signal and perform amplitude adjustment to obtain the resonance demodulated pulse. The implementation circuit of the detector 140, the demodulation filter 150 and the sensitivity normalization adjuster 160 can refer to fig. 3.
In one embodiment of the present invention, the centralized controller 200 includes:
an adder 210, configured to receive each resonance demodulation pulse, generate a multi-set result signal including each resonance demodulation pulse, and send the multi-set result signal to a peak detector 220;
a peak detector 220, configured to perform peak detection on the received multi-set result signal to determine a maximum amplitude of each resonance demodulation pulse, generate a set peak signal carrying the maximum amplitude, and send the set peak signal to the emitted light intensity controller 230;
an emission light intensity controller 230 for determining an emission light intensity control signal of a corresponding intensity according to a magnitude of a maximum amplitude of the aggregate peak signal, wherein when the maximum amplitude exceeds a first amplitude threshold, an emission light intensity control signal for reducing an emission intensity of the detection light of each of the photo-reflective sensors 100 is generated and transmitted to each of the photo-reflective sensors 100; when the maximum amplitude is lower than the second amplitude threshold value, an emission light intensity control signal for increasing the emission intensity of the detection light of each of the photoelectric reflective sensors 100 is generated, and the emission light intensity control signal is transmitted to each of the photoelectric reflective sensors 100.
Referring to fig. 4, the adder 210 may receive the resonance demodulation pulses transmitted by each of the photoreflective sensors 100, generate a multi-set resultant signal containing each of the resonance demodulation pulses, and transmit the multi-set resultant signal to the peak detector 220. The input of the peak detector 220 is connected to the output of the adder 210, and the received multi-ensemble resultant signal can be subjected to peak detection to determine the maximum amplitude of each resonance demodulation pulse, so as to generate an ensemble peak signal carrying the maximum amplitude, which is sent to the transmitted light intensity controller 230. The input end of the emitted light intensity controller 230 is connected to the output end of the peak detector 220, and when a target condition is triggered, that is, when resonance demodulation pulses sent by the same photo electric reflective sensor 100 are received twice, the maximum amplitude of each resonance demodulation pulse obtained in the period is determined, and the maximum amplitude is compared with the first amplitude threshold and the second amplitude threshold to obtain an emitted light intensity control signal with corresponding intensity, so as to control the emitted intensity of the detection light of each photo electric reflective sensor 100. The circuit for implementing the adder 210, the peak detector 220 and the emitted light intensity controller 230 can be seen in fig. 3.
In an embodiment of the present invention, the centralized controller 200 may further include an object identifier 240, configured to perform quantization detection on the received resonance demodulation pulses according to a preset quantization threshold, and output object identification signals corresponding to the resonance demodulation pulses one to one.
The object identifier 240 may quantitatively detect the resonance demodulation pulse output by each of the photoreflective sensors 100, and the object identifier 240, the peak detector 220, the emitted light intensity controller 230, and other devices are incorporated into the integrated controller 200, so that the design of the integrated controller 200 may reduce the circuit and volume of each of the photoreflective sensors 100, compared to incorporating these components into each of the photoreflective sensors 100, so as to save resources.
The specific operation of the quantization detection is to compare each resonance demodulation pulse with a preset quantization threshold, and in practical implementation, when the resonance demodulation pulse is higher than the preset quantization threshold, a high-level object identification signal can be obtained, which is generally indicated by 1, that is, at the time, the photoelectric reflective sensor 100 corresponding to the object identification signal identifies the detected object. Conversely, when the resonance demodulation pulse is below a preset quantization threshold, a low level of the object identification signal, which may be generally represented by 0, may be obtained.
Of course, the emitted light of the interferent may also affect the accuracy of the object identification signal, and reference is made to fig. 5, which is a simulation diagram of the correct output of the detected object information for identifying and suppressing the interference in the embodiment of the present invention. In the embodiment of fig. 5, the abscissa represents time, the ordinate represents the amplitude of each signal, and the emitted light intensity control signal, the simulated reflected light, the photoelectric output signal of sensor No. 1, the resonance filtering signal of sensor No. 1, the detection signal of sensor No. 1, the resonance demodulation pulse of sensor No. 1, the object identification signal of sensor No. 1, the multi-aggregation result signal obtained from the resonance demodulation pulses of sensors No. 1 to 5, the aggregation peak signal including the maximum amplitude information in the multi-aggregation result signal, the aggregation identification signal, and the reference voltage signal are sequentially represented from top to bottom. In this embodiment, sensor No. 1 detects a reflected signal at a timing of 10 milliseconds, and after finally determining that the reflected signal is a disturbance signal, the emission intensity of the emission light intensity control signal produced is decreased so that the emission intensity of the detection light of each sensor is decreased. Since the distance between the detection object and the sensor is closest, when the sensor No. 1 detects the reflected light of the interfering object, it indicates that the emission intensity of the detection light is higher, so that the sensor No. 1 detects the reflection of the interfering object farther than the detection object, after the emission signal of the detection light of each photoelectric reflective sensor 100 including the sensor No. 1 is reduced, it can be found in fig. 5 that when the resonance demodulation pulse of the sensor No. 1 is obtained for the second time, the intensity of the detected interference signal is reduced, and since the intensity of the interference signal is reduced, when the corresponding object identification signal and the set identification signal are obtained, the interference signal does not affect the sensor No. 1 any more, thereby improving the accuracy of the sensor No. 1.
In an embodiment of the present invention, the centralized controller 200 further includes an aggregation discriminator 250 for receiving the multi-aggregation result signal, performing quantization detection on the multi-aggregation result signal according to a quantization threshold, and outputting an aggregation identification signal.
Referring to fig. 4, the input terminal of the set discriminator 250 is connected to the output terminal of the adder 210, and the multi-set result signal output by the adder 210 is quantized and detected to obtain the set identification signal, and the setting of the quantization threshold of the set identification signal may refer to the setting of the object identification signal.
In particular implementations, the set identifier may further include a reference voltage 260 for providing a reference voltage to the summer 210, the peak detector 220, and the emitted light intensity controller 230. The reference voltage may be 5 volts.
Referring to fig. 3, the circuit for implementing the object identifier 240, the set discriminator 250 and the reference voltage 260 may be represented by 5 object identification signals output by the object identifier 240 in fig. 3, which represents 5 object identification signals respectively corresponding to the 5 resonance demodulation pulses output by the sensors in one embodiment. It should be noted that the implementation circuit in fig. 3 is an example of an implementation circuit of each component, and in the specific implementation, the implementation circuit includes selection of components such as resistors and capacitors and a circuit structure, and certain adjustment can be performed on the premise that the requirements of the present solution are met, without affecting the implementation of the present invention.
In an embodiment of the present invention, the photoelectric reflective sensor array may further include a first interference suppressor for receiving each object identification signal, and when the number of outputs of each object identification signal at a certain time is greater than 1, each object identification signal at the certain time is determined as an interference signal.
In specific implementation, the first interference suppressor may be disposed inside the centralized controller 200, or may be disposed separately according to actual needs, without affecting the implementation of the present invention. Normally, 2 or more photoelectric reflective sensors 100 do not detect and output network information at the same time, but a network cable boom and other objects perpendicular to the center line of the track and crossing over the track may simultaneously reflect light to each photoelectric reflective sensor 100 and generate signals, or sunlight, light, etc. simultaneously direct light to each photoelectric reflective sensor 100 and generate signals. Therefore, each object identification signal can be received by using the first interference suppressor, and when the number of outputs of each object identification signal at a certain time is greater than 1, each object identification signal at the certain time is determined as an interference signal, and the interference signal in this case can be referred to as a synchronous interference signal.
The first interference suppressor can determine the interference signal according to the Boolean algebraic expression and complete the elimination of the interference signal. The boolean algebraic expression may be:
F(i)＝IN(i)；IN(i)＝0；O(i)＝not[IN(1)or IN(2)or IN(3)or……IN(n)]and F(i)
wherein i is 1, 2, 3, … … n, and o (i) is an output signal from which the synchronous interference signal is removed.
IN the case of removing the synchronous interference, the synchronous interference may be implemented by software, or may be implemented by a hardware digital circuit, where the implementation of the hardware digital circuit can be shown IN fig. 6, interference removal is implemented on synchronous interference signals IN (0) to IN (4) received by n-0 to 5 sensors, and IN the specific implementation, the output after the synchronous interference removal may be shown IN fig. 7, that is, waveform diagrams of O (0) to O (4) IN fig. 7.
In an embodiment of the present invention, the photoelectric reflective sensor array may further include a second interference suppressor, and the second interference suppressor may receive each object identification signal, and determine that two object identification signals are non-interference signals when the detection object is determined to be a dual-cable partially parallel structure and only two object identification signals are output at a certain time.
The contact network line of the subway has a structure in which two lines are parallel locally, and therefore, there is a possibility that two photoelectric reflective sensors 100 detect a detection object at the same time, that is, the network line is detected at the same time, and detection signals of the two photoelectric reflective sensors 100 are both correct. And receiving each object identification signal by using a second interference suppressor, and determining that the two object identification signals are non-interference signals when the detected object is determined to be a dual-network-line local parallel structure and only two object identification signals are output at a certain moment. In one embodiment, the following software implementation may be used:
FOR K＝1TO L；
FOR I＝1TO N；
HE＝0；
FOR J＝1TO N；
IF IN(J)＝1THEN HE＝HE+1；
NEXT J；
IF(HE＝1OR HE＝2)AND IN(I)＝1THEN O(I)＝1；
NEXT I；
NEXT K。
the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The principle and the implementation of the present invention are explained in the present application by using specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. An optoelectronic reflective sensor array, comprising:
the photoelectric reflection type sensors are placed at different positions and used for transmitting detection light to a detection object, receiving reflected light of the detection object and performing resonance demodulation on the reflected light to obtain resonance demodulation pulses;
the integrated controller is used for determining the maximum amplitude of each received resonance demodulation pulse when a target condition is triggered, generating a transmission light intensity control signal for reducing the transmission intensity of the detection light of each photoelectric reflective sensor when the maximum amplitude exceeds a first amplitude threshold, and sending the transmission light intensity control signal to each photoelectric reflective sensor; when the maximum amplitude is lower than a second amplitude threshold, generating the emission light intensity control signal for increasing the emission intensity of the detection light of each photoelectric reflective sensor, and sending the emission light intensity control signal to each photoelectric reflective sensor;
the target condition is that the centralized controller receives the resonance demodulation pulses sent by the same photoelectric reflection type sensor twice, and the second amplitude threshold is smaller than or equal to the first amplitude threshold;
the integrated controller further comprises an object identifier, which is used for carrying out quantitative detection on each received resonance demodulation pulse according to a preset quantitative threshold value and outputting each object identification signal corresponding to each resonance demodulation pulse one to one;
the photoelectric reflection type sensor array further comprises a first interference suppressor, wherein the first interference suppressor is used for receiving each object identification signal, and when the number of the output object identification signals at a certain moment is greater than 1, each object identification signal at the moment is determined as an interference signal.
2. The sensor array of claim 1, wherein each of the photoelectric reflective sensors comprises:
the pulse light emitting module is used for sending pulse light to a detection object and receiving the emitted light intensity control signal sent by the centralized controller;
the resonance filtering module is used for receiving the reflected light of the detection object and performing resonance filtering on the reflected light to obtain a resonance filtering signal;
and the demodulation module is used for receiving the resonance filtering signal and demodulating the resonance filtering signal to obtain resonance demodulation pulse.
3. The sensor array of claim 2, wherein the resonance filtering module comprises:
the parallel resonance type photoelectric receiver is used for receiving the reflected light of the detection object based on the same frequency as the emitted light intensity control signal and carrying out resonance amplification on the reflected light to obtain a photoelectric output signal;
and the resonance filter is used for receiving the photoelectric output signal and performing resonance filtering to obtain a resonance filtering signal.
4. The sensor array of claim 2, wherein the demodulation module comprises:
a detector for determining a detection value of the resonance filtered signal received and generating a detection signal;
a demodulation filter for receiving and demodulating the detection signal to generate a demodulation pulse signal;
and the sensitivity normalization regulator is used for receiving the demodulation pulse signal and carrying out amplitude regulation to obtain the resonance demodulation pulse.
5. The sensor array of any one of claims 1 to 4, wherein the centralized controller comprises:
the adder is used for receiving each resonance demodulation pulse, generating a multi-set result signal containing each resonance demodulation pulse and sending the multi-set result signal to the peak detector;
the peak detector is used for performing peak detection on the received multi-set result signal to determine the maximum amplitude of each resonance demodulation pulse, generating a set peak signal carrying the maximum amplitude and sending the set peak signal to the transmitted light intensity controller;
the emission light intensity controller is configured to determine an emission light intensity control signal with a corresponding intensity according to the magnitude of the maximum amplitude of the aggregate peak signal, wherein when the maximum amplitude exceeds a first amplitude threshold, an emission light intensity control signal for reducing the emission intensity of the detection light of each of the photoelectric reflective sensors is generated, and the emission light intensity control signal is sent to each of the photoelectric reflective sensors; and when the maximum amplitude is lower than a second amplitude threshold value, generating the emission light intensity control signal for increasing the emission intensity of the detection light of each photoelectric reflective sensor, and sending the emission light intensity control signal to each photoelectric reflective sensor.
6. The sensor array of claim 1, wherein the photoelectric reflective sensor array further comprises a second interference suppressor for receiving each of the object identification signals, and determining that the two object identification signals are non-interfering signals when the detection object is determined to be a dual-cable partially parallel structure and there are and only two of the object identification signals at a time that are output.
7. The sensor array of claim 5, wherein the centralized controller further comprises an aggregate discriminator for receiving the multiple aggregate result signals, performing a quantization detection on the multiple aggregate result signals according to the quantization threshold, and outputting an aggregate identification signal.
8. The sensor array of claim 5, wherein the set identifier further comprises a reference voltage for providing a reference voltage to the summer, the peak detector, and the emitted light intensity controller.
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