CN102143379A - Reliability detection device for automatic switchover filter disc of vidicon and control method thereof - Google Patents
Reliability detection device for automatic switchover filter disc of vidicon and control method thereof Download PDFInfo
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- CN102143379A CN102143379A CN2011100731658A CN201110073165A CN102143379A CN 102143379 A CN102143379 A CN 102143379A CN 2011100731658 A CN2011100731658 A CN 2011100731658A CN 201110073165 A CN201110073165 A CN 201110073165A CN 102143379 A CN102143379 A CN 102143379A
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Abstract
The invention relates to a reliability detection device for an automatic switchover filter disc of a vidicon. The reliability detection device mainly comprises a main circuit board, an LCD (liquid crystal display) screen, a brightness adjustable LED (light-emitting diode) light source, a brightness detection circuit, a filter disc switch-over drive circuit and an audible and visual reminder, wherein the main circuit board mainly comprises a single-chip microcomputer and a toggle switch, the audible and visual reminder mainly comprises a warning LED and a buzzer, a driving signal is automatically output through the brightness adjustable light source and the brightness detection circuit to ensure that the filter disc is automatically switched over, different light conditions are simulated, and whether the automatic switchover filter disc of the vidicon operates reliably in different environments is detected. The reliability detection device of the invention has a compact structure, a small size and high reliability and is convenient to install, the LCD screen can display the detection frequency and the error number, and the price reliability detection device has low price and good versatility, adopts the GPIO (general purpose input/output) control, is simple and convenient to control, occupies less chip resources, has moderate production cost and is suitable for general application.
Description
Technical field
The present invention relates to video monitoring, image processing field, be specifically related to a kind of reliability checkout gear of video camera automatic switchover filter disc.
Background technology
Along with technology and expanding economy, video camera is applied to every field widely, and the video camera filter disc that can automatically switch is also more and more used.For the automatic switchover of video camera filter disc, mature technique is all arranged both at home and abroad, however still immature to the reliability detection technique of filter disc switching.Because the video camera filter disc uses under various environment, the problem that some are difficult to expect can occur, the reliability of video camera automatic switchover filter disc is difficult to guarantee that this has also restricted applying of video camera automatic switchover filter disc to a certain extent.
Summary of the invention
Deficiency at prior art, the invention provides a kind of reliability checkout gear of video camera automatic switchover filter disc, by variable-brightness light source and testing circuit thereof, automatically output drive signal automaticallyes switch filter disc, simulation different light rays environment, can detect video camera automatic switchover filter disc reliably working under varying environment.
Technical scheme of the present invention is: a kind of reliability checkout gear of video camera automatic switchover filter disc mainly comprises: the led light source of main circuit board, LCD display, adjustable brightness, light luminance testing circuit, filter disc switch driving circuit and acousto-optic hint;
Main circuit board comprises single-chip microcomputer and toggle switch, and main circuit board is powered by power module;
The led light source of adjustable brightness is regulated brightness with simulation different light rays environment by adjusting the adjustable resistance resistance;
LCD display shows the number of times that detects and the number of times of makeing mistakes;
Whether the light luminance testing circuit detects led light source luminous, and testing result is passed to single-chip microcomputer;
The filter disc switch driving circuit provides and drives the electric current that filter disc switches;
Acousto-optic hint mainly comprises alarm led and buzzer, points out current filter disc switching state and the warning that makes mistakes;
The led light source of adjustable brightness places the lower end of the photo resistance of luminance detection circuit, the output of luminance detection circuit is received on the P2.0 port of single-chip microcomputer, detect lighting and extinguishing of led light source, the signal that single-chip microcomputer detects outputs to the filter disc switch driving circuit by P0.0 and P0.1 port, be connected with the BIN pin with the AIN of chip for driving, the filter disc switch driving circuit is output as the AOUT and the BOUT pin of chip for driving, be directly connected to two inputs of filter disc switching device shifter, filter disc is placed between the infrared transmitting tube and receiving tube of infrared correlation module, to detect the filter disc switching state, testing result is by infrared output output to module, the output of infrared correlation module is connected to the P2.6 port of single-chip microcomputer, the input control that the P2.7 port of single-chip microcomputer is received the adjustable LED circuit of light sources is lighted and is extinguished, so far constitute the major loop of this device, in addition, P0.2 to the P0.6 port of single-chip microcomputer is connected respectively to pin 1 in the LCD display module to pin 5, the P0.7 of single-chip microcomputer and P2.1 port are connected respectively to the input of buzzer circuit of sound and light alarm module and the input of warning led circuit, and 8 road toggle switchs are connected to P1.0 to the P1.7 port of single-chip microcomputer.
The control method of the reliability checkout gear of video camera automatic switchover filter disc of the present invention comprises the steps:
Comprise the steps:
Step 5 by infrared correlation testing circuit, judges whether filter disc normally switches;
In the described step 1, at first, definite mode of operation that needs is provided with mode of operation by the toggle switch on the main circuit board:
The first step is provided with the detection number of times, and the invention provides four kinds and detect the different mode of operation of number of times, be respectively 100,1000,10000,100000 times, use different detection number of times at different filter discs;
Second step was provided with detecting pattern, the invention provides two kinds of detecting patterns, be respectively make mistakes stop mode and continuous detecting pattern, under the stop mode of makeing mistakes, mistake occur if detect the filter disc switching, stop immediately detecting and reporting an error, if there is not the wrong detection number of times that then detects setting always; Under the continuous detecting pattern, switch and mistake to occur if detect filter disc, report an error and show errors number, detection is proceeded, and up to the detection number of times of setting, detection stops;
Secondly, by toggle switch the filter disc switching frequency can be set, the invention provides 5 kinds of different filter disc switching frequencies, be respectively 0.1Hz, 0.5Hz, 1Hz, 2.5Hz, 5Hz, after setting the detection number of times, the switching frequency of selection is fast more, and then the relevant detection time is short more; Otherwise then detection time is long more; As required, use different switching frequencies.
In the described step 2, by mcu programming, control LED produces the light source of lighting repeatedly-extinguishing:
The first step, read the detection number of times: the mode of operation signal that is produced by toggle switch draws the detection number of times, and LED once lights-extinguishes is a light period, detects number of times and is led light source light period number;
Second step, read detecting pattern: the mode of operation signal that is produced by toggle switch draws detecting pattern, detecting pattern is divided into make mistakes stop mode and continuous detecting pattern, under the stop mode of makeing mistakes, the led light source dwelling period is luminous when mistake occurring, keep extinguishing state, if there is not the wrong number of times that then detects setting always; Under the continuous detecting pattern, when mistake occurring, the led light source hold period is luminous, and up to the detection number of times that reaches setting, led light source extinguishes;
In the 3rd step, read the filter disc switching frequency:
In the formula, f
LPBe the filter disc switching frequency,
T
LEDBe the LED light period.
If the switching frequency of selecting is 0.5 time/second, then can draw led light source light period T by formula 1
LEDIt is 2 seconds; If the switching frequency of selecting is 1 time/second, then can draw led light source light period T by formula 1
LEDIt is 1 second;
The 4th step, by GPIO led light source is controlled, led light source is lighted when being output as high level, and led light source extinguishes when being output as low level, makes by the programming Control output signal and lights the fall time and equate;
In the described step 3, at first, the anode of led light source connects power supply, and negative electrode is received GPIO through an adjustable resistance; Change the voltage at led light source two ends by the resistance of adjusting adjustable resistance, thereby control the brightness of led light source, simulate various light environments by the variation of brightness;
Secondly, add a light luminance detection module on LED, the photo resistance resistance difference under different light rays intensity in this circuit can be come out the light on and off state feedback of led light source by a comparison circuit.
In the described step 4, at first, use single-chip microcomputer output consecutive pulses width modulated (PWM) signal, its duty ratio (high level lasting time with cycle ratio) is
In the formula, DutyCycle is a duty ratio,
T
WBe high level lasting time,
T
LEDBe the led light source light period,
Wherein, T
WAnd T
LEDBe value that can programmed settings,
The corresponding relation that exists is switched in lighting-extinguish with filter disc of LED, and when LED lights the environment that expression has illumination, this moment, filter disc switched to infrared fileter, when LED extinguishes unglazed photograph of expression or environment with dark light, should switch to common filter at this moment; Because LED lights and time of extinguishing equates, promptly use the time of infrared fileter and common filter to equate in each cycle, can draw T
W=T
LED-T
W, therefore when the switching cycle that needs filter disc be that the LED light period is n during second, just can set T
LEDBe n second, T
WBe n/2 second;
Secondly, this pwm signal is input in the filter disc switch driving circuit, drives filter disc by drive circuit again.
In the described step 5, at first, infrared correlation circuit mainly is made up of infrared correlation pipe and comparison circuit, infrared correlation pipe has an infrared transmitting tube and an infrared receiving tube, when the infrared signal of infrared transmitting tube after reflection is received by infrared receiving tube, the resistance of infrared receiving tube changes, and generally the version with voltage embodies on circuit, and through the output result after obtaining handling after the comparison circuit shaping;
Secondly, filter disc places between infrared transmitting tube and the infrared receiving tube, after normally powering on, can switch to infrared fileter, when the input voltage both positive and negative polarity is put upside down, switches to common filter; When filter disc switched to infrared fileter, infrared light was filtered, and infrared receiving tube can not be received infrared signal like this, if then the filter disc switch operating is normal for infrared circuit output this moment high level, otherwise if the infrared circuit output low level, then the filter disc switch operating is made mistakes; When filter disc switched to common filter, infrared receiving tube can receive signal, and then the filter disc switch operating is normal as if the infrared circuit output low level, otherwise if infrared circuit output high level, then the filter disc switch operating is made mistakes; Whether thus, can detect filter disc switches normally;
In the described step 6, adopting resolution is the LCD display of 84 * 48 resolution, and LCD display shows switching times, filter disc switches to infrared fileter from common filter, switch back, be designated as switching once, LCD display shows current switching times in real time;
In the described step 7, when makeing mistakes, at first, by buzzer of a GPIO control, report to the police, light-emitting diode of another GPIO control makes its flicker;
Secondly, when the filter disc switching makes mistakes, show errors number in real time.
Advantage of the present invention is:
1, compact conformation of the present invention, compact size, the reliability height, easy for installation;
2, LCD display of the present invention can show and detects number of times and errors number, and low price, versatility are good;
3, adjust led light source brightness flexibly, can simulate various different light rays environment;
4, can mode of operation and filter disc switching frequency be set flexibly by toggle switch;
5, adopt GPIO control, versatility is good, controls simple and conveniently, and it is few to take mcu resource;
6, production cost of the present invention is moderate, is suitable for widespread usage.
Description of drawings
Fig. 1 system architecture diagram of the present invention;
Fig. 2 power circuit of the present invention;
Fig. 3 light luminance testing circuit of the present invention;
Fig. 4 filter disc switch driving circuit of the present invention;
Fig. 5 single chip circuit of the present invention;
Fig. 6 system program flow chart of the present invention;
Fig. 7 LCD display interface circuit of the present invention;
Fig. 8 toggle switch interface circuit of the present invention;
Fig. 9 LED of the present invention lights and extinguishes flow chart;
The led circuit of the adjustable brightness of Figure 10 the present invention;
Figure 11 output pwm signal flow chart of the present invention;
The infrared correlation testing circuit of Figure 12 the present invention;
Figure 13 filter disc of the present invention switches the LCD flow for displaying figure that makes mistakes;
Figure 14 audible and visual alarm cue circuit.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
A kind of reliability checkout gear of video camera automatic switchover filter disc, mainly comprise: the led light source of main circuit board, LCD display, adjustable brightness, light luminance testing circuit, filter disc switch driving circuit and acousto-optic hint, system architecture diagram of the present invention is as shown in Figure 1;
Main circuit board comprises single-chip microcomputer and toggle switch, and single chip circuit and toggle switch interface circuit are respectively Fig. 5 and shown in Figure 8, and main circuit board is powered by power module, and power circuit as shown in Figure 2;
The led light source of adjustable brightness is regulated brightness with simulation different light rays environment by adjusting the adjustable resistance resistance, and the led circuit of adjustable brightness as shown in figure 10;
LCD display shows the number of times that detects and the number of times of makeing mistakes, and the LCD display interface circuit as shown in Figure 7;
Whether the light luminance testing circuit detects led light source luminous, and testing result is passed to single-chip microcomputer, and the light luminance testing circuit as shown in Figure 3;
The filter disc switch driving circuit provides and drives the electric current that filter disc switches, and filter disc switch driving circuit such as Fig. 4 institute are not;
Acousto-optic hint mainly comprises alarm led and buzzer, points out current filter disc switching state and the warning that makes mistakes, and the audible and visual alarm cue circuit as shown in figure 14;
The adjustable LED light source places the lower end of the photo resistance of luminance detection circuit, the output of light luminance testing circuit is received on the P2.0 port of single-chip microcomputer, detect lighting and extinguishing of led light source, the signal that single-chip microcomputer detects outputs to the filter disc switch driving circuit by P0.0 and P0.1 port, be connected with the BIN pin with the AIN of chip for driving, the filter disc switch driving circuit is output as the AOUT and the BOUT pin of chip for driving, be directly connected to two inputs of filter disc switching device shifter, filter disc is placed between the infrared transmitting tube and receiving tube of infrared correlation module, to detect the filter disc switching state, testing result is by infrared output output to module, the output of infrared correlation module is connected to the P2.6 port of single-chip microcomputer, the input control that the P2.7 port of single-chip microcomputer is received the adjustable LED circuit of light sources is lighted and is extinguished, so far constitute the major loop of this device, in addition, P0.2 to the P0.6 port of single-chip microcomputer is connected respectively to pin 1 in the LCD display module to pin 5, the P0.7 of single-chip microcomputer and P2.1 port are connected respectively to the input of buzzer circuit of sound and light alarm module and the input of warning led circuit, and 8 road toggle switchs are connected to P1.0 to the P1.7 port of single-chip microcomputer.
The acp chip of main circuit board is the C8051F320 single-chip microcomputer, circuit as shown in Figure 5, the programming of inner Flash memory feasible system both can have been made program storage and also can make non-volatile data storage.The JTAG artificial circuit provides in-circuit emulation at full speed in the chip, does not take user resources in the chip.Debug commands such as supporting breakpoint, single step, point of observation, move and stop, and support memory and register check and modification.This device adopts this chip, can satisfy the needs of detection, and the global procedures design flow diagram as shown in Figure 6.
LCD display adopts the LCD MODULE by the 5110 LCD exploitation repacking of Nokia, the LCD display interface circuit as shown in Figure 7, the resolution of this LCD display is 84 * 48.Because content displayed is few, this LCD display can be satisfied the demand, and also has advantages such as low price, versatility are good simultaneously.The Wiring port of this LCD display is as shown in table 1.
Table 1LCD display screen Wiring port
The control method of video camera automatic switchover filter disc reliability checkout gear comprises the steps:
At first, the mode of operation that determine to need has one eight tunnel toggle switch on the main circuit board of device, the toggle switch interface circuit as shown in Figure 8, the toggle switch operating state is as shown in table 2, can mode of operation be set by toggle switch:
Table 2 toggle switch operating state
(1) the detection number of times being set, the invention provides four kinds and detect the different mode of operation of number of times, is respectively 100,1000,10000,100000 times, and the user can use different detection number of times at different filter discs.
(2) detecting pattern being set, the invention provides two kinds of detecting patterns, is respectively make mistakes stop mode and continuous detecting pattern, under the stop mode of makeing mistakes, mistake appears in case detect the filter disc switching, stop immediately detecting, and report an error, if there is not the wrong number of times that then detects setting always; Under the continuous detecting pattern, switch and mistake to occur in case detect filter disc, report an error and show errors number, detection is proceeded, and up to the number of times that reaches setting, detection stops;
Secondly, by toggle switch the filter disc switching frequency can be set, the invention provides 5 kinds of different filter disc switching frequencies, be respectively 0.1Hz, 0.5Hz, 1Hz, 2.5Hz, 5Hz, after having set the detection number of times, the switching frequency of selection is fast more, and then the relevant detection time is short more; Otherwise then detection time is long more; The user can use different switching frequencies as required.
At first, adopt GPIO control, versatility is good, controls simple and conveniently, and it is few to take mcu resource.
Secondly, by mcu programming, flow chart is controlled led light source and is produced the light source of lighting repeatedly-extinguishing as shown in Figure 6:
(1) read the detection number of times, the mode of operation signal that is produced by toggle switch draws the detection number of times; Led light source is once lighted-extinguished is a light period, detects number of times and is led light source light period number, and LED lights and extinguishes flow chart as shown in Figure 9;
(2) read detecting pattern, the mode of operation signal that is produced by toggle switch draws detecting pattern; Detecting pattern is divided into make mistakes stop mode and continuous detecting pattern; Under the stop mode of makeing mistakes, the led light source dwelling period is luminous when mistake occurring, keeps extinguishing state, if there is not the wrong number of times that then detects setting always; Under the continuous detecting pattern, when mistake occurring, the led light source hold period is luminous, and up to the detection number of times that reaches setting, led light source extinguishes;
(3) read the filter disc switching frequency, filter disc switching frequency and LED light period are reciprocal relation:
In the formula, f
LPBe the filter disc switching frequency,
T
LEDBe the LED light period;
If the switching frequency of selecting is 0.5 time/second, then can draw LED light period TLED by formula 1 is 2 seconds; If the switching frequency of selecting is 1 time/second, then can draw LED light period TLED by formula 1 is 1 second;
(4) by GPIO led light source is controlled, led light source is lighted when being output as high level, and led light source extinguishes when being output as low level, makes by the programming Control output signal and lights the fall time and equate.
At first, the anode of led light source connects power supply, negative electrode is received GPIO through an adjustable resistance, by adjusting the resistance of adjustable resistance, can change the voltage at led light source two ends, thereby the brightness of control led light source, physical circuit connected mode are as shown in figure 10, simulate the different based environments that close by the variation of brightness;
Secondly, add a light luminance detection module on led light source, circuit as shown in Figure 3; In this module photo resistance is arranged, resistance difference under different light rays intensity can be come out the light on and off state feedback of led light source by a comparison circuit; Concrete comparative approach is, changes both end voltage by the resistance of adjusting adjustable resistance, sets the threshold values of a comparison, adjustable resistance resistance when this threshold values is exactly the led light source minimum brightness that allows, this circuit feed back to single-chip microcomputer voltage this can be expressed as
Wherein V is an output voltage,
R is the resistance of adjustable resistance,
α is a threshold values.
At first, use the single-chip microcomputer output pwm signal, its duty ratio (high level lasting time with cycle ratio) is
In the formula, DutyCycle is a duty ratio,
T
WBe high level lasting time,
T
LEDBe the led light source light period;
Wherein, T
WAnd T
LEDBe value that can programmed settings, the flow chart of output pwm signal as shown in figure 11, the corresponding relation that exists is switched in lighting-extinguish with filter disc of led light source, when led light source is lighted the environment that expression has illumination, this moment, filter disc should switch to infrared fileter, when led light source extinguishes unglazed photograph of expression or environment with dark light, should switch to common filter at this moment; Because led light source is lighted and time of extinguishing equates, promptly use the time of infrared fileter and common filter to equate in each cycle, can draw T
W=T
LED-T
W, therefore when the switching cycle that needs filter disc be that the LED light period is n during second, just can set T
LEDBe n second, T
WBe n/2 second;
Secondly, this pwm signal is input in the filter disc switch driving circuit, drives filter disc by drive circuit again; Driver element adopts the BA6208 chip, if directly the output with MUC drives the filter disc switching, can be because undercurrent causes most of filter disc normally not switch, the maximum output current of BA6208 chip is 500 milliamperes, come output current by this chip, enough drive filter disc and switch, physical circuit as shown in Figure 4.
Step 5 by infrared correlation testing circuit, judges whether filter disc normally switches.
At first, infrared correlation circuit is made up of infrared correlation pipe and comparison circuit, the concrete connection as shown in figure 12, infrared correlation pipe has an infrared transmitting tube and an infrared receiving tube, filter disc places between transmitting tube and the receiving tube, when the infrared signal of transmitting tube after reflection is received pipe and receives, the resistance of receiving tube can change, generally the version with voltage embodies on circuit, and through the output result after obtaining handling after the comparison circuit shaping;
Secondly, filter disc places between infrared transmitting tube and the infrared receiving tube, after normally powering on, can switch to infrared fileter, when the input voltage both positive and negative polarity is put upside down, switches to common filter; When filter disc switched to infrared fileter, infrared light was filtered, and infrared receiving tube can not be received infrared signal like this, if then the filter disc switch operating is normal for infrared circuit output this moment high level, otherwise if the infrared circuit output low level, then the filter disc switch operating is made mistakes; When filter disc switched to common filter, infrared receiving tube can receive signal, and then the filter disc switch operating is normal as if the infrared circuit output low level, otherwise if infrared circuit output high level, then the filter disc switch operating is made mistakes; Whether thus, can detect filter disc switches normally.
At first, because required content displayed is few, therefore adopting resolution is the LCD of 84 * 48 resolution, both can satisfy the demonstration needs, has saved cost again; LCD shows English alphabet and numeral, and size is 8 * 16.The LCD display demonstration is divided into 3 parts, and first is 16 row of top, and second portion is middle 16 row, and third part is that bottom 16 goes.Current toggle count shows in the first of LCD display, with " CNT " expression counting, is 10 times as current detection number of times, then is shown as on the LCD " CNT00010 ".
Secondly, LCD shows switching times, and filter disc switches to infrared fileter from common filter, switches back again, is designated as switching once; LCD shows current switching times in real time.
At first, when makeing mistakes, carry out sound and light alarm by a GPIO buzzer of control and a light-emitting diode:
(1) owing to directly be connected with buzzer, is difficult to drive buzzer, therefore adopts triode to carry out power amplification herein with GPIO.Triode is selected C8550 for use, low price, and multiplication factor can reach 85 to 300 times, can satisfy the demand;
(2) with light-emitting diode of a GPIO control, can realize that by programming frequency is that 2Hz is to be the flicker of 0.5s in the cycle;
Secondly, when the filter disc switching makes mistakes, show errors number in real time; Errors number promptly shows on 16 row down in the LCD display third part, with " ERR " expression, is 10 times as current errors number, then is shown as on the LCD display " ERR00010 ".
Claims (9)
1. the reliability checkout gear of a video camera automatic switchover filter disc mainly comprises: the led light source of main circuit board, LCD display, adjustable brightness, light luminance testing circuit, filter disc switch driving circuit and acousto-optic hint;
Main circuit board comprises single-chip microcomputer and toggle switch, and main circuit board is powered by power module;
The led light source of adjustable brightness is regulated brightness with simulation different light rays environment by adjusting the adjustable resistance resistance;
LCD display shows the number of times that detects and the number of times of makeing mistakes;
Whether the light luminance testing circuit detects led light source luminous, and testing result is passed to single-chip microcomputer;
The filter disc switch driving circuit provides and drives the electric current that filter disc switches;
Acousto-optic hint mainly comprises alarm led and buzzer, points out current filter disc switching state and the warning that makes mistakes;
The led light source of adjustable brightness places the lower end of the photo resistance of luminance detection circuit, the output of light luminance testing circuit is received on the P2.0 port of single-chip microcomputer, detect lighting and extinguishing of led light source, the signal that single-chip microcomputer detects outputs to the filter disc switch driving circuit by P0.0 and P0.1 port, be connected with the BIN pin with the AIN of chip for driving, the filter disc switch driving circuit is output as the AOUT and the BOUT pin of chip for driving, be directly connected to two inputs of filter disc switching device shifter, filter disc is placed between the infrared transmitting tube and receiving tube of infrared correlation module, to detect the filter disc switching state, testing result is by infrared output output to module, the output of infrared correlation module is connected to the P2.6 port of single-chip microcomputer, the input control that the P2.7 port of single-chip microcomputer is received the adjustable LED circuit of light sources is lighted and is extinguished, so far constitute the major loop of this device, in addition, P0.2 to the P0.6 port of single-chip microcomputer is connected respectively to pin 1 in the LCD display module to pin 5, the P0.7 of single-chip microcomputer and P2.1 port are connected respectively to the input of buzzer circuit of sound and light alarm module and the input of warning led circuit, and 8 road toggle switchs are connected to P1.0 to the P1.7 port of single-chip microcomputer.
2. the control method of the described video camera automatic switchover of claim 1 filter disc reliability checkout gear comprises the steps:
Step 1 is provided with mode of operation and filter disc switching frequency by toggle switch;
Step 2 produces the light source of lighting repeatedly-extinguishing by GPIO control led light source;
Step 3, the brightness by adjustable resistance adjustment led light source produces control logic by the light luminance testing circuit;
Step 4 produces pulse width modulation (PWM) signal by MCU, exports by the filter disc switch driving circuit;
Step 5 by infrared correlation testing circuit, judges whether filter disc normally switches;
Step 6, LCD display show current switching times;
Step 7, if make mistakes, then buzzer warnings of ringing, alarm led is with the frequency scintillation of 2Hz, simultaneously the demonstration number of times of makeing mistakes on LCD display.
3. the control method of the reliability checkout gear of video camera automatic switchover filter disc according to claim 2 is characterized in that in the described step 1,
At first, definite mode of operation that needs is provided with mode of operation by the toggle switch on the main circuit board:
The first step is provided with the detection number of times;
In second step, detecting pattern is set;
Secondly, by toggle switch the filter disc switching frequency is set.
4. the control method of the reliability checkout gear of video camera automatic switchover filter disc according to claim 2 is characterized in that in the described step 2, and by mcu programming, the control led light source produces the light source of lighting repeatedly-extinguishing:
The first step reads the detection number of times;
In second step, read detecting pattern;
In the 3rd step, read the filter disc switching frequency;
The 4th step, by GPIO led light source is controlled, led light source is lighted when being output as high level, and led light source extinguishes when being output as low level, makes led light source light the fall time by the programming Control output signal and equates.
5. the control method of the reliability checkout gear of video camera automatic switchover filter disc according to claim 2 is characterized in that described step 3 produces control logic by the light luminance testing circuit and is:
At first, the anode of led light source connects power supply, and negative electrode is received GPIO through an adjustable resistance; Change the voltage at led light source two ends by the resistance of adjusting adjustable resistance, thereby control the brightness of led light source, simulate the different light rays environment by the variation of brightness;
Secondly, on led light source, add a light luminance detection module, can extinguish state feedback to lighting of led light source by a comparison circuit and come out.
6. the control method of the reliability checkout gear of video camera automatic switchover filter disc according to claim 2 is characterized in that producing pulse width modulation (PWM) signal by MCU described in the described step 4, exports by the filter disc switch driving circuit:
At first, by single-chip microcomputer output consecutive pulses width modulated (PWM) signal;
Secondly, this pwm signal is input in the filter disc switch driving circuit, drives filter disc by drive circuit again.
7. the control method of the reliability checkout gear of video camera automatic switchover filter disc according to claim 2 is characterized in that described in the described step 5 by infrared correlation testing circuit, judges whether filter disc normally switches:
At first, infrared correlation circuit mainly is made up of infrared correlation pipe and comparison circuit, infrared correlation pipe has an infrared transmitting tube and an infrared receiving tube, when the infrared signal of infrared transmitting tube after reflection is received by infrared receiving tube, the resistance of infrared receiving tube changes, and shaping obtains exporting the result through comparison circuit;
Secondly, filter disc places between infrared transmitting tube and the infrared receiving tube, after normally powering on, switch to infrared fileter, infrared light is filtered, and infrared receiving tube can not be received infrared signal, if then the filter disc switch operating is normal for infrared circuit output this moment high level, otherwise if the infrared circuit output low level, then the filter disc switch operating is made mistakes; When the input voltage both positive and negative polarity is put upside down, switch to common filter, infrared receiving tube can receive signal, then the filter disc switch operating is normal as if the infrared circuit output low level, otherwise, if infrared circuit output high level, whether then the filter disc switch operating is made mistakes, detect filter disc thus and switch normally.
8. the control method of the reliability checkout gear of video camera automatic switchover filter disc according to claim 2, it is characterized in that in the described step 6, employing resolution is 84 * 48 LCD display demonstration switching times, filter disc switches to infrared fileter from common filter, switch back again, be designated as switching once, LCD display shows current switching times in real time.
9. the control method of the reliability checkout gear of video camera automatic switchover filter disc according to claim 2, it is characterized in that in the described step 7, when makeing mistakes, at first, by the warning of ringing of buzzer of GPIO control, light-emitting diode of another GPIO control makes the frequency scintillation of alarm led with 2Hz; Secondly, when the filter disc switching made mistakes, LCD display showed errors number in real time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110073165A CN102143379B (en) | 2011-03-25 | 2011-03-25 | Reliability detection device for automatic switchover filter disc of vidicon and control method thereof |
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| CN108111843A (en) * | 2017-12-25 | 2018-06-01 | 信利光电股份有限公司 | A kind of test method of movable optical filter camera module and test system |
| WO2019127176A1 (en) * | 2017-12-28 | 2019-07-04 | 天彩电子（深圳）有限公司 | Method and device for realizing ir-cut state feedback on the basis of infrared luminance change |
| CN109996061A (en) * | 2017-12-29 | 2019-07-09 | 浙江宇视科技有限公司 | The method for detecting abnormality and device of IR-CUT |
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| CN110296815A (en) * | 2019-07-02 | 2019-10-01 | 舜宇光学(中山)有限公司 | Detection device and detection method for electromotive focusing camera lens |
| CN110505477A (en) * | 2019-09-17 | 2019-11-26 | 普联技术有限公司 | Double filter test methods, device, equipment and storage medium |
| CN112770021A (en) * | 2019-11-06 | 2021-05-07 | 中磊电子（苏州）有限公司 | Camera and filter switching method |
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