CN111077584A - Filtering processing method for laser correlation device - Google Patents
Filtering processing method for laser correlation device Download PDFInfo
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- CN111077584A CN111077584A CN201811219409.7A CN201811219409A CN111077584A CN 111077584 A CN111077584 A CN 111077584A CN 201811219409 A CN201811219409 A CN 201811219409A CN 111077584 A CN111077584 A CN 111077584A
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Abstract
The invention discloses a filtering processing method for a laser correlation device, which comprises the steps of determination of a light-passing threshold and a light-shielding threshold, light intensity judgment, filtering processing and signal receiving and processing. The filtering processing method for the laser correlation device provided by the invention can timely respond to voltage fluctuation and signal fluctuation caused by piston wind, ensures the timeliness and accuracy of signal feedback, and has better environmental adaptability.
Description
Technical Field
The invention relates to the field of rail transit safety, in particular to a filtering processing method for a laser correlation device in a rail transit system safety detection system.
Background
The laser correlation device is widely applied to interval protection equipment and used for detecting the safety detection field of a rail transit system. In the use process of the laser correlation device, the change of the light intensity along with the time is as shown in fig. 1, and along with the increase of the light intensity, the fluctuation of the signal can occur to cause the signal to be unstable, and the reasons of the potential safety hazard include the following three points:
(1) the receiving end of the laser correlation device is a phototriode, the feedback signal is an analog quantity signal, and the normally selected switching threshold (50%) is unscientific;
(2) certain voltage fluctuation can be generated in the on-off process of the laser correlation device, and the fluctuation causes the instability of reading of the feedback signal;
(3) the laser correlation device is usually a remote (30m or more than 100 m) detection device, and due to problems or application occasions, air density between the transmitting device and the receiving device changes (piston wind), and fluctuation of signals at the receiving end occurs.
In the above situations, the generated fluctuation is very likely to cause the receiving device to fluctuate around the threshold value, which causes the potential safety hazard.
The current filtering solution is to perform signal processing after the signal is stabilized without processing when the signal received by the receiving end fluctuates rapidly. The method has the problems of long filtering time and untimely feedback and response.
Disclosure of Invention
The invention aims to solve the problem of feedback hysteresis of a laser correlation device in response to voltage fluctuation and piston wind in the prior art, and provides a filtering processing method for the laser correlation device, which can respond to voltage fluctuation and signal fluctuation caused by piston wind in time and ensure timeliness and accuracy of signal feedback.
The invention provides a filtering processing method for a laser correlation device, which comprises the following steps:
s1, determination of a light passing threshold and a light shielding threshold: the lowest light intensity value of the stable light-passing state is used as a light-passing threshold value through experiments, the highest light intensity value of the stable shading state is used as a shading threshold value, and the light intensity is divided into the following three sections by the light-passing threshold value and the shading threshold value:
and (3) light-on state: the light intensity is greater than a light-passing threshold value;
intermediate state: the light intensity is between the light-passing threshold and the light-shielding threshold;
shading state: the light intensity is less than the shading threshold value;
s2, light intensity judgment: when the light intensity crosses the light-on threshold from the light-on state to the intermediate state, step S3 is performed; when the light intensity crosses the light shielding threshold from the intermediate state to the light shielding state, step S4 is executed; when the light intensity crosses the light shielding threshold from the light shielding state to the intermediate state, step S5 is executed; when the light intensity crosses the light-on threshold from the intermediate state to the light-on state, performing step S6;
s3, filtering: judging the laser correlation state as a light-transmitting state, forming a light-transmitting signal and feeding the light-transmitting signal back to a signal receiving device of the laser correlation device, and executing step S7;
s4, filtering: judging the laser correlation state as a light shielding state, forming a light shielding signal and feeding the light shielding signal back to a signal receiving device of the laser correlation device, and executing step S7;
s5, filtering: judging the laser correlation state as a light shielding state, forming a light shielding signal and feeding the light shielding signal back to a signal receiving device of the laser correlation device, and executing step S7;
s6, filtering: judging the laser correlation state as a light-transmitting state, forming a light-transmitting signal and feeding the light-transmitting signal back to a signal receiving device of the laser correlation device, and executing step S7;
s7, signal receiving and processing: and a signal processing device for receiving the light blocking signal or the light transmitting signal transmitted in the steps S3-S6 and transmitting the light blocking signal or the light transmitting signal to the laser correlation device.
The intermediate state is kept, the state is a light-on state above a light-on threshold value, and the state is a light-off state below a light-off threshold value. When the light is stepped from the light-passing threshold to the intermediate state, the light is kept in the light-passing state until the light is lower than the light-shielding threshold, and the light is changed into the light-shielding state; and the light-shielding state is kept when the light-shielding state is stepped from the lower light-shielding threshold to the intermediate state, and the light-transmitting state is changed to the light-transmitting state when the light-shielding state is stepped from the lower light-shielding threshold to the intermediate state.
In the filter processing method for a laser correlation device according to the present invention, preferably, the determining of the light-transmitting threshold and the light-blocking threshold in step S1 includes:
s11, gradually increasing the intensity of the laser emitted by the laser correlation device along with the change of time, and recording all the light intensity values changed from the shading state to the light-on state and the light intensity values changed from the light-on state to the shading state by the signal recording device;
s12, repeating the step S11 for 10-100 times, and recording all the light intensity values changed from the shading state to the light-on state and the light intensity values changed from the light-on state to the shading state;
and S13, summarizing the light intensity values recorded in the step S12, eliminating abnormal values, and taking the lowest light intensity value in the stable light-passing state as a light-passing threshold value and the highest light intensity value in the stable light-shielding state as a light-shielding threshold value.
The light passing threshold and the light shading threshold of the use environment can be accurately deduced through multiple simulation experiments in different use environments, and the signal stability can be effectively improved through the transmission of two switch control signals of the light passing threshold and the light shading threshold.
According to the filtering processing method for the laser correlation device, as an optimal mode, the light-passing threshold is 60-80% of the maximum light intensity, and the light-shielding threshold is 20-40% of the maximum light intensity.
In a preferred embodiment of the filter processing method for a laser correlation device according to the present invention, the light-passing threshold is 70% of the maximum light intensity, and the light-blocking threshold is 30% of the maximum light intensity.
According to the invention, the switch of the control signal is set to be the light-passing threshold and the light-shading threshold, so that the feedback hysteresis caused by voltage fluctuation and piston wind can be effectively avoided, the stability and the accuracy of signal judgment are improved, and the potential safety hazard can be timely discovered by the laser correlation device.
The invention further determines the two switches of the light-passing threshold and the light-shading threshold by simulating the field environment, so that the invention has better environmental adaptability and improves the accuracy and timeliness of signal judgment.
Drawings
FIG. 1 is a graph illustrating light intensity in the prior art;
FIG. 2 is a schematic diagram of the light intensity of a filtering method for a laser correlation device;
FIG. 3 is a flow chart of a filtering method for a laser correlation device;
fig. 4 is a flowchart of a filtering processing method step S1 for the laser correlation device.
Detailed Description
As shown in fig. 3, the present invention provides a filtering processing method for a laser correlation device, including the following steps:
s1, determination of a light passing threshold and a light shielding threshold: the lowest light intensity value of the stable light-passing state is used as a light-passing threshold value through experiments, the highest light intensity value of the stable shading state is used as a shading threshold value, and the light intensity is divided into the following three sections by the light-passing threshold value and the shading threshold value:
and (3) light-on state: the light intensity is greater than a light-passing threshold value;
intermediate state: the light intensity is between the light-passing threshold and the light-shielding threshold;
shading state: the light intensity is less than the shading threshold value;
as shown in fig. 4, the method comprises the following steps:
s11, gradually increasing the intensity of the laser emitted by the laser correlation device along with the change of time, and recording all the light intensity values changed from the shading state to the light-on state and the light intensity values changed from the light-on state to the shading state by the signal recording device;
s12, repeating the step S11 for 10-100 times, and recording all the light intensity values changed from the shading state to the light-on state and the light intensity values changed from the light-on state to the shading state;
s13, summarizing the light intensity values recorded in the step S12, eliminating abnormal values, taking the lowest light intensity value in the stable light-passing state as a light-passing threshold value, and taking the highest light intensity value in the stable light-shielding state as a light-shielding threshold value;
s2, light intensity judgment: when the light intensity crosses the light-on threshold from the light-on state to the intermediate state, step S3 is performed; when the light intensity crosses the light shielding threshold from the intermediate state to the light shielding state, step S4 is executed; when the light intensity crosses the light shielding threshold from the light shielding state to the intermediate state, step S5 is executed; when the light intensity crosses the light-on threshold from the intermediate state to the light-on state, performing step S6;
s3, filtering: judging the laser correlation state as a light-transmitting state, forming a light-transmitting signal and feeding the light-transmitting signal back to a signal receiving device of the laser correlation device, and executing step S7;
s4, filtering: judging the laser correlation state as a light shielding state, forming a light shielding signal and feeding the light shielding signal back to a signal receiving device of the laser correlation device, and executing step S7;
s5, filtering: judging the laser correlation state as a light shielding state, forming a light shielding signal and feeding the light shielding signal back to a signal receiving device of the laser correlation device, and executing step S7;
s6, filtering: judging the laser correlation state as a light-transmitting state, forming a light-transmitting signal and feeding the light-transmitting signal back to a signal receiving device of the laser correlation device, and executing step S7;
s7, signal receiving and processing: and a signal processing device for receiving the light blocking signal or the light transmitting signal transmitted in the steps S3-S6 and transmitting the light blocking signal or the light transmitting signal to the laser correlation device.
The light intensity diagram is shown in fig. 2, when the light intensity is stepped from being higher than the light-passing threshold to the intermediate state, the light intensity is kept in the light-passing state until being lower than the light-shielding threshold, and the light intensity is changed into the light-shielding state; when the light intensity is stepped from below the shading threshold to the intermediate state, the shading state is kept, and until the light intensity is higher than the light passing threshold, the light intensity is changed into the light passing state.
This embodiment can effectually avoid because of the feedback hysteresis quality that voltage fluctuation and piston wind lead to, improves the stability and the accuracy that the signal was judged.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that any and all changes, modifications or equivalents may be made thereto without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. A filtering processing method for a laser correlation device is characterized in that: the method comprises the following steps:
s1, determination of a light passing threshold and a light shielding threshold: the minimum light intensity value of the stable light-passing state is used as a light-passing threshold value through experiments, the maximum light intensity value of the stable light-shading state is used as a light-shading threshold value, and the light intensity is divided into the following three sections by the light-passing threshold value and the light-shading threshold value:
and (3) light-on state: the light intensity is greater than the light-passing threshold;
intermediate state: the light intensity is between the light-passing threshold and the light-shading threshold;
shading state: the light intensity is less than the shading threshold value;
s2, light intensity judgment: when the light intensity crosses the light-on threshold from the light-on state to the intermediate state, performing step S3; when the light intensity crosses the light shielding threshold from the intermediate state to the light shielding state, performing step S4; when the light intensity crosses the light shielding threshold from the light shielding state to the intermediate state, performing step S5; when the light intensity crosses the light-on threshold from the intermediate state to the light-on state, performing step S6;
s3, filtering: judging the laser correlation state as a light-transmitting state, forming a light-transmitting signal and feeding the light-transmitting signal back to a signal receiving device of the laser correlation device, and executing step S7;
s4, filtering: judging the laser correlation state as a light shielding state, forming a light shielding signal and feeding the light shielding signal back to a signal receiving device of the laser correlation device, and executing step S7;
s5, filtering: judging the laser correlation state as a light shielding state, forming a light shielding signal and feeding the light shielding signal back to a signal receiving device of the laser correlation device, and executing step S7;
s6, filtering: judging the laser correlation state as a light-transmitting state, forming a light-transmitting signal and feeding the light-transmitting signal back to a signal receiving device of the laser correlation device, and executing step S7;
s7, signal receiving and processing: and a signal processing device for receiving the light shielding signal or the light transmitting signal transmitted in the steps S3-S6 and transmitting the light shielding signal or the light transmitting signal to a laser correlation device.
2. The filter processing method for the laser correlation device according to claim 1, wherein: the determination of the light-passing threshold and the light-blocking threshold in step S1 includes the steps of:
s11, gradually increasing the intensity of the laser emitted by the laser correlation device along with the change of time, and recording all the light intensity values changed from the shading state to the light-on state and the light intensity values changed from the light-on state to the shading state by the signal recording device;
s12, repeating the step S11 for 10-100 times, and recording all the light intensity values changed from the shading state to the light-on state and the light intensity values changed from the light-on state to the shading state;
and S13, summarizing the light intensity values recorded in the step S12, eliminating abnormal values, and taking the lowest light intensity value in the stable light-passing state as the light-passing threshold value and the highest light intensity value in the stable light-shielding state as the light-shielding threshold value.
3. The filter processing method for the laser correlation device according to any one of claims 1 to 2, wherein: the light-passing threshold is 60-80% of the maximum light intensity, and the light-shading threshold is 20-40% of the maximum light intensity.
4. The filter processing method for the laser correlation device according to claim 3, wherein: the light-passing threshold is 70% of the maximum light intensity, and the light-blocking threshold is 30% of the maximum light intensity.
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