CN103616897A - Intelligent control system and method for double-field of view thermal imager - Google Patents
Intelligent control system and method for double-field of view thermal imager Download PDFInfo
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Abstract
The invention discloses an intelligent control system of a double-field of view thermal imager. The intelligent control system comprises an infrared lens, a thermal imaging detector, a microprocessor, a stepping motor and a limit switch. The intelligent control system is characterized in that the microprocessor drives the stepping motor to operate through a motor driving circuit, and the input end of the microprocessor is connected with a photoelectric encoder and a temperature sensor. A control method of the intelligent control system of the double-field of view thermal imager comprises the steps of (a) detecting states, (b) moving to a starting position, (c) determining the distance of a large field of view, (d) moving to the position of the large field of view, (e) judging whether switching of fields of view is needed, (f) determining the position and temperature, (g) acquiring a reference temperature, (h) judging whether position compensation is needed, (i) switching to a small field of view, (j) determining focus bias quantity, (k) conducting forward compensation, and (l) conducting reverse compensation. The double-field of view thermal imager can be used for focus position compensation of the fields of view at different temperatures, is accurate, reliable, stable in operation, capable of meeting quick switching between the fields of view, and capable of being widely applied to many fields including weaponry, scout monitoring, people search and rescue and the like.
Description
Technical field
The present invention relates to a kind of double-view field thermal imaging system intelligent control system and method, in particular, relate in particular to and a kind ofly to double-view field thermal imaging system, can carry out double-view field thermal imaging system intelligent control system and the method that visual field is quick and precisely switched, carried out focal position intelligent compensation according to variation of ambient temperature.
Background technology
Infrared ray is long because of its wavelength, cannot, by Human Perception, belong to invisible light.As a part for electromagnetic spectrum, our detectable its temperature.As long as the temperature of object outside radiations heat energy more than absolute zero.Thermal imaging is a kind of by using infrared imaging measuring instrument " to check " or the technology of " measurement " object radiation heat energy.Infrared optical lens on thermal imaging detector focuses on the infrared ray sending from object.Detector sends information to sensor electronics, to carry out image processing.The data that electronic component is sent detector are translated into the image that can check on view finder or normal video monitor.Infrared acquisition is particularly useful for the target detection under night and bad-weather condition, has certain abilities such as cigarette, mist, haze, snow that penetrate, and can realize remote, round-the-clock observation, is widely used in the fields such as national defence, industry, medical treatment, safety monitoring.
Double-view field thermal imaging system can be realized the target search aiming of large visual field and the tracking of small field of view, compares with monoscopic thermal imaging system, and complete function, application is convenient, can meet under a plurality of patterns and work; Compare with continuous zoom thermal imaging system, cost of development is low, and the design cycle is short, and optical system is simpler and more direct, practical.
In actual applications, double-view field thermal imaging system, carrying out visual field while switching, requires quick and precisely, to meet the search of target and the requirement of catching.When larger variation occurs environment temperature, because infrared eyeglass self character, focal position can be offset, and causes imaging clear not, affects monitoring effect.
Summary of the invention
The present invention, in order to overcome the shortcoming of above-mentioned technical matters, provides a kind of double-view field thermal imaging system intelligent control system and method.
Double-view field thermal imaging system intelligent control system of the present invention, comprise infrared lens, thermal imaging detector, microprocessor, order about infrared lens motion stepper motor, detect the limit switch of infrared lens reference position, infrared ray in infrared lens acquisition field of view, thermal imaging detector is converted into electric signal by light signal, and limit switch is connected with the input end of microprocessor; It is characterized in that: described microprocessor orders about stepper motor by motor-drive circuit and works, the input end of microprocessor is connected with the photoelectric encoder that gathers stepper motor motion state; Microprocessor is also connected with for gathering the temperature sensor of ambient temperature.
Extraneous infrared ray enters by infrared lens, and thermal imaging detector is converted into electric signal by light signal, and can form vision signal and export.Microprocessor has the effect of signals collecting, data operation and control output, and microprocessor orders about stepper motor by motor-drive circuit and rotates, and stepper motor drives infrared lens to move.Whether microprocessor can detect infrared lens in reference position by limit switch, by photoelectric encoder, can know the residing positional information of infrared lens.By temperature sensor, can record extraneous environment temperature, to carry out position compensation according to extraneous ambient temperature value,, accurately infrared image clear to obtain.
Double-view field thermal imaging system intelligent control system of the present invention, described microprocessor is controlled the imaging parameters of thermal imaging detector by RS232 driving circuit; Microprocessor is connected with host computer by RS485 driving circuit.Microprocessor is controlled the parameter of thermal imaging detector by RS232 driving circuit, as the regulation and control of contrast, brightness, pseudo-colours, image detail enhancing.Communication by the realization of RS485 driving circuit with host computer, can feed back the status information of current system, as visual field state, lens location, environment temperature and parameter detector, to facilitate staff to grasp in real time the running status of system to host computer.
Double-view field thermal imaging system intelligent control system of the present invention, described microprocessor is connected with the eeprom memory for data storage.
The control method of double-view field thermal imaging system intelligent control system of the present invention, is characterized in that, comprises the following steps:
A). detectability bit switch state, after system powers on, microprocessor, by the state of detectability bit switch, judges that whether infrared lens is in reference position, if in reference position, performs step c); If not in reference position, perform step b); B). move to reference position, stepper motor forward rotation is ordered about infrared lens and is moved to reference position, execution step c); C). determine large visual field distance, microprocessor reads the data message of large visual field from eeprom memory, and determines the distance of large visual field and infrared lens reference position
; D). move to large field positions, stepper motor rotates backward and orders about infrared lens motion, when the positional information of the infrared lens of photoelectric encoder output being detected
with
while equating, show that infrared lens has moved to large field positions; E). judge whether to carry out visual field switching, judge whether to receive that host computer sends from large visual field, switches to the instruction of small field of view, if received, perform step f); If do not received, continue to wait for; F). determine field positions and temperature, obtain the field of regard position that need to be switched to
, and gather extraneous temperature by temperature sensor
; G). obtain reference temperature, microprocessor reads reference temperature from eeprom memory
; H). judge whether to need position compensation, establish
for temperature variation benchmark, judgement
with
magnitude relationship, if
>
, show that ambient temperature variation has exceeded variation benchmark, need to carry out the compensation of focal position, execution step j); If
≤
, show that ambient temperature changes in changing reference range, without the compensation of carrying out focal position, execution step i); I). switch to small field of view position, microcontroller orders about infrared lens to small field of view position by stepper motor
motion, when the output information of photoelectric encoder being detected
=
, stop the rotation of stepper motor, now switched to small field of view position; J). determine focus offset, if
for positive number, need forward compensating focusing position, according to
size from eeprom memory, read focus offset
, execution step k); If
for negative, need Contrary compensation focal position, according to
size from EEPROM, read focus offset
, execution step l); K). forward compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
time, stop the rotation of stepper motor, with the visual field of forward position compensation, switch and put in place; L). Contrary compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
-
time, stop the rotation of stepper motor, with the visual field of reverse position compensation, switch and put in place.
Step a) judges that for the state by limit switch whether infrared lens is in reference position, if not in reference position by step b) adjust; Step c) for determining the distance of large visual field and reference position
.Steps d) by gathering the infrared lens positional information of photoelectric encoder output, moved to large field positions.Step e) for judging whether to receive the visual field switching command that host computer sends, as do not received, continue to wait for.Step h) in, by judgement ambient temperature
with reference temperature
the absolute value of difference and temperature variation benchmark
size determine whether to carry out the compensation of focal position; When
>
, illustrating that the reference temperature difference of storing in ambient temperature and system is larger, in infrared lens there is larger variation in the focal length of eyeglass, need to carry out position compensation; When
≤
, illustrate that in infrared lens, the focal length variations of eyeglass is not obvious, without carrying out position compensation.Step j), in, because infrared optical system has obvious thermal effect, during temperature variation, refractive index can have greatly changed, expanding with heat and contract with cold of lens barrel in addition, and this will affect the imaging performance of optical system, need carry out the compensation of focal position.
The control method of double-view field thermal imaging system intelligent control system of the present invention, described steps d) the focal position compensation process that also comprises large visual field in: d-1). gather ambient temperature, by temperature sensor, gather extraneous temperature
; D-2). obtain reference temperature, microprocessor reads reference temperature from eeprom memory
; D-3). judge whether to need position compensation, judgement
with
magnitude relationship, if
>
, show that ambient temperature variation has exceeded variation benchmark, need to carry out the compensation of focal position, execution step d-4); If
≤
, show that ambient temperature changes in changing reference range, without the compensation of carrying out focal position, execution step e); D-4). determine focus offset, if
for positive number, need forward compensating focusing position, according to
size from EEPROM, read focus offset
, execution step d-5); If
for negative, need Contrary compensation focal position, according to
size from eeprom memory, read focus offset
, execution step d-6); D-5). forward compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
time, stop the rotation of stepper motor, show that the forward position of large visual field has compensated; D-6). Contrary compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
-
time, stop the rotation of stepper motor, show that the reverse position of large visual field has compensated.
The invention has the beneficial effects as follows: double-view field thermal imaging system intelligent control system of the present invention and control method, microcontroller drives infrared lens to rotate by stepper motor, and gather the information of photoelectric encoder, and infrared lens is accurately located, realize accurately switching fast of visual field.By temperature sensor, judge that environment temperature is with respect to the situation of change of reference temperature, coordinate data in eeprom memory, calculate the variation that obtains lens focus position under condition of different temperatures, Driving Stepping Motor is realized the intelligent compensation to lens location, can guarantee all the time high-quality blur-free imaging.
Double-view field thermal imaging system intelligent control system of the present invention has following characteristics: (1) is accurately reliable, stable, can be used as the double-view field of all size or the control system of many visual fields infrared lens and uses.(2) applying flexible, simple to operation, meet visual field and switch fast, and the requirement such as can finely tune.(3) under different ambient temperature conditions, intelligent adjustable lens focal position voluntarily, without artificial setting, intelligent and high-efficiency, accurately and reliably.Can be widely used in weaponry, scout the numerous areas such as monitoring, personnel's search and rescue.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of double-view field thermal imaging system intelligent control system of the present invention;
Fig. 2 is the control method process flow diagram of double-view field thermal imaging system intelligent control system of the present invention.
In figure: 1 limit switch, 2 microprocessors, 3 eeprom memories, 4 RS232 driving circuits, 5 stepper motors, 6 motor-drive circuits, 7 RS485 driving circuits, 8 photoelectric encoders, 9 temperature sensors, 10 thermal imaging detectors, 11 infrared lens, 12 host computers.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, provided the circuit theory diagrams of double-view field thermal imaging system intelligent control system of the present invention, it comprises microprocessor 2, infrared lens 11, thermal imaging detector 10, limit switch 1, stepper motor 5, motor-drive circuit 6, photoelectric encoder 8, eeprom memory 3, temperature sensor 9; Microcontroller has collection, computing and control action, and the infrared ray that external object sends enters by infrared lens 11, and thermal imaging detector 10, for light signal is converted into electric signal, can form vision signal output.Whether limit switch 1 is for detection of infrared lens 11 in initial position, and while being positioned at initial position as infrared lens 11, limit switch 1 is low level, when microcontroller detects limit switch 1 for low level state, can know that infrared lens 11 is in initial position.Microcontroller 2 can gather extraneous real time temperature value by temperature sensor 9, with the temperature by extraneous, determines whether to carry out position compensation to thermal imaging system, and the size of position compensation numerical value.
As shown in Figure 2, provided the process flow diagram of the control method of double-view field thermal imaging system intelligent control system of the present invention, it can be realized by following steps:
A). detectability bit switch state, after system powers on, microprocessor logical 2 is crossed the state of detectability bit switch 1, judges that infrared lens 11, whether in reference position, if in reference position, performs step c); If not in reference position, perform step b);
B). move to reference position, stepper motor 5 forward rotation are ordered about infrared lens 11 and are moved to reference position, execution step c);
C). determine large visual field distance, microprocessor 2 reads the data message of large visual field from eeprom memory 3, and determines the distance of large visual field and infrared lens 11 reference positions
;
D). move to large field positions, stepper motor 5 rotates backward and orders about infrared lens 11 motions, when the positional information of the infrared lens 11 of photoelectric encoder 8 outputs being detected
with
while equating, show that infrared lens 11 has moved to large field positions;
E). judge whether to carry out visual field switching, judge whether to receive that host computer sends from large visual field, switches to the instruction of small field of view, if received, perform step f); If do not received, continue to wait for;
F). determine field positions and temperature, obtain the field of regard position that need to be switched to
, and gather extraneous temperature by temperature sensor 9
;
G). obtain reference temperature, microprocessor 2 reads reference temperature from eeprom memory 3
;
H). judge whether to need position compensation, establish
for temperature variation benchmark, judgement
with
magnitude relationship, if
>
, show that ambient temperature variation has exceeded variation benchmark, need to carry out the compensation of focal position, execution step j); If
≤
, show that ambient temperature changes in changing reference range, without the compensation of carrying out focal position, execution step i);
I). switch to small field of view position, microcontroller 2 orders about infrared lens 11 to small field of view position by stepper motor 5
motion, when the output information of photoelectric encoder 8 being detected
=
, stop the rotation of stepper motor, now switched to small field of view position;
J). determine focus offset, if
for positive number, need forward compensating focusing position, according to
size from eeprom memory, read focus offset
, execution step k); If
for negative, need Contrary compensation focal position, according to
size from eeprom memory 3, read focus offset
, execution step l);
K). forward compensation, microcontroller 2 orders about infrared lens 11 motions by stepper motor 5, when the output information of photoelectric encoder 8 being detected
=
time, stopping the rotation of stepper motor 5, band forward position compensation visual field switching puts in place;
L). Contrary compensation, microcontroller orders about infrared lens 11 motions by stepper motor 5, when the output information of photoelectric encoder 8 being detected
=
-
time, stop the rotation of stepper motor 5, with the visual field of reverse position compensation, switch and put in place.
The focal position compensation process that also can comprise following large visual field wherein, steps d):
D-1). gather ambient temperature, by temperature sensor, gather extraneous temperature
;
D-2). obtain reference temperature, microprocessor reads reference temperature from eeprom memory
;
D-3). judge whether to need position compensation, judgement
with
magnitude relationship, if
>
, show that ambient temperature variation has exceeded variation benchmark, need to carry out the compensation of focal position, execution step d-4); If
≤
, show that ambient temperature changes in changing reference range, without the compensation of carrying out focal position, execution step e);
D-4). determine focus offset, if
for positive number, need forward compensating focusing position, according to
size from EEPROM, read focus offset
, execution step d-5); If
for negative, need Contrary compensation focal position, according to
size from eeprom memory, read focus offset
, execution step d-6);
D-5). forward compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
time, stop the rotation of stepper motor, show that the forward position of large visual field has compensated;
D-6). Contrary compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
-
time, stop the rotation of stepper motor, show that the reverse position of large visual field has compensated.
As shown in table 1, provided focal length, the rear cut-off distance variation with temperature tables of data of 30/90mm double-view field camera lens, corresponding large visual field when focal length is 30mm, corresponding small field of view when focal length is 90mm; Data in table 1 are stored in eeprom memory 3, in order to calling.
Table 1
In the focal position compensation process of large visual field, small field of view, reference temperature
all be chosen for 20 ℃,
can be chosen for 5 ℃.Owing to being subject to the impact of temperature, in the time of 20 ℃, focal length corresponding to large visual field is that 30.0012mm, rear cut-off distance are 18.912mm; Focal length corresponding to small field of view is that 89.9991mm, rear cut-off distance are 18.912mm.In the process of focal position compensation, if collect extraneous temperature, be-10 ℃, the focal length under large visual field becomes 29.9997mm, should, by the 19.122mm that becomes of rear cut-off distance, can realize the focal position compensation under large visual field; Focal length under small field of view becomes 89.2679mm, should, by the 19.362mm that becomes of rear cut-off distance, can realize the focal position compensation under small field of view.Similarly, at different temperature, adopt corresponding focus-compensating method; In table 1, there is no the temperature of recording, adopt the temperature nearest with it to compensate, as 0 ℃ of corresponding data of 4 ℃ of employings, 6 ℃ adopt 10 ℃ of corresponding data.
Double-view field thermal imaging system intelligent control system of the present invention and method, by Driving Stepping Motor, coordinate and gather photoelectric encoder information, realizes the quick and precisely switching of visual field; By temperature sensor, if the reference range that variation of ambient temperature surpasses appointment detected,, when carrying out visual field switching, can carry out intelligent compensation to lens focus position, guarantee that each view field imaging is clear, be not subject to the impact of variation of ambient temperature.
Native system adopts high speed microprocessor, stable, complete function; Adopt high precision stepper motor and photoelectric encoder, fast and accurate for positioning, response in time rapidly; Adopt high sensitivity temperature sensor, realize the accurate monitoring to environment temperature; Adopt ripe motor driving, RS232 and RS485 driving circuit, stable and reliable operation.Programmed control is short and sweet, and system features in convenient is quick, can effectively guarantee that double-view field thermal imaging system is in the round-the-clock stable operation of complicated applications environment.
Claims (5)
1. a double-view field thermal imaging system intelligent control system, comprise infrared lens (11), thermal imaging detector (10), microprocessor (2), order about infrared lens motion stepper motor (5), detect the limit switch (1) of infrared lens reference position, infrared ray in infrared lens acquisition field of view, thermal imaging detector is converted into electric signal by light signal, and limit switch is connected with the input end of microprocessor; It is characterized in that: described microprocessor orders about stepper motor (5) work by motor-drive circuit (6), and the input end of microprocessor is connected with the photoelectric encoder (8) that gathers stepper motor motion state; Microprocessor is also connected with the temperature sensor (9) for gathering ambient temperature.
2. double-view field thermal imaging system intelligent control system according to claim 1, is characterized in that: described microprocessor (2) is controlled the imaging parameters of thermal imaging detector by RS232 driving circuit (4); Microprocessor is connected with host computer (12) by RS485 driving circuit (7).
3. double-view field thermal imaging system intelligent control system according to claim 1 and 2, is characterized in that: described microprocessor (2) is connected with the eeprom memory (3) for data storage.
4. the control method based on double-view field thermal imaging system intelligent control system claimed in claim 1, is characterized in that, comprises the following steps:
A). detectability bit switch state, after system powers on, microprocessor (2), by the state of detectability bit switch (1), judges that infrared lens (11), whether in reference position, if in reference position, performs step c); If not in reference position, perform step b);
B). move to reference position, stepper motor forward rotation is ordered about infrared lens and is moved to reference position, execution step c);
C). determine large visual field distance, microprocessor reads the data message of large visual field from eeprom memory, and determines the distance of large visual field and infrared lens reference position
;
D). move to large field positions, stepper motor rotates backward and orders about infrared lens motion, when the positional information of the infrared lens of photoelectric encoder output being detected
with
while equating, show that infrared lens has moved to large field positions;
E). judge whether to carry out visual field switching, judge whether to receive that host computer sends from large visual field, switches to the instruction of small field of view, if received, perform step f); If do not received, continue to wait for;
F). determine field positions and temperature, obtain the field of regard position that need to be switched to
, and gather extraneous temperature by temperature sensor
;
G). obtain reference temperature, microprocessor reads reference temperature from eeprom memory
;
H). judge whether to need position compensation, establish
for temperature variation benchmark, judgement
with
magnitude relationship, if
>
, show that ambient temperature variation has exceeded variation benchmark, need to carry out the compensation of focal position, execution step j); If
≤
, show that ambient temperature changes in changing reference range, without the compensation of carrying out focal position, execution step i);
I). switch to small field of view position, microcontroller orders about infrared lens to small field of view position by stepper motor
motion, when the output information of photoelectric encoder being detected
=
, stop the rotation of stepper motor, now switched to small field of view position;
J). determine focus offset, if
for positive number, need forward compensating focusing position, according to
size from EEPROM, read focus offset
, execution step k); If
for negative, need Contrary compensation focal position, according to
size from eeprom memory, read focus offset
, execution step l);
K). forward compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
time, stop the rotation of stepper motor, with the visual field of forward position compensation, switch and put in place;
L). Contrary compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
-
time, stop the rotation of stepper motor, with the visual field of reverse position compensation, switch and put in place.
5. the control method of double-view field thermal imaging system intelligent control system according to claim 4, is characterized in that: the focal position compensation process that also comprises large visual field described steps d):
D-1). gather ambient temperature, by temperature sensor, gather extraneous temperature
;
D-2). obtain reference temperature, microprocessor reads reference temperature from eeprom memory
;
D-3). judge whether to need position compensation, judgement
with
magnitude relationship, if
>
, show that ambient temperature variation has exceeded variation benchmark, need to carry out the compensation of focal position, execution step d-4); If
≤
, show that ambient temperature changes in changing reference range, without the compensation of carrying out focal position, execution step e);
D-4). determine focus offset, if
for positive number, need forward compensating focusing position, according to
size from EEPROM, read focus offset
, execution step d-5); If
for negative, need Contrary compensation focal position, according to
size from eeprom memory, read focus offset
, execution step d-6);
D-5). forward compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
time, stop the rotation of stepper motor, show that the forward position of large visual field has compensated;
D-6). Contrary compensation, microcontroller orders about infrared lens by stepper motor and moves, when the output information of photoelectric encoder being detected
=
-
time, stop the rotation of stepper motor, show that the reverse position of large visual field has compensated.
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| CN103994826A (en) * | 2014-05-26 | 2014-08-20 | 山东神戎电子股份有限公司 | Non-refrigeration thermal infrared imager capable of switching view fields |
| CN104730677A (en) * | 2014-12-17 | 2015-06-24 | 湖北久之洋红外系统股份有限公司 | Uncooled thermal infrared imager continuous zooming and fast automobile focusing circuit and method |
| CN105547493A (en) * | 2015-12-08 | 2016-05-04 | 中国航空工业集团公司洛阳电光设备研究所 | Assembling and adjusting method for three-field of view confocal plane in infrared imaging technology and imaging device |
| CN105430280B (en) * | 2015-12-25 | 2018-07-24 | 山东神戎电子股份有限公司 | A kind of double-view field thermal imaging system and its auto focusing method |
| CN109462360A (en) * | 2018-09-17 | 2019-03-12 | 昆明物理研究所 | Two axis servomotor controller of thermal infrared imager |
| CN110275266A (en) * | 2019-05-30 | 2019-09-24 | 中国科学院长春光学精密机械与物理研究所 | The airborne big small field of view switching mechanism of coaxial optical system |
| CN111426390A (en) * | 2020-04-01 | 2020-07-17 | 济南和普威视光电技术有限公司 | Double-view-field thermal infrared imager and view field switching method thereof |
| WO2020187007A1 (en) * | 2019-03-19 | 2020-09-24 | 杭州海康微影传感科技有限公司 | Method and device for focusing thermal imaging lens on the basis of temperature compensation |
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| CN105547493B (en) * | 2015-12-08 | 2019-01-29 | 中国航空工业集团公司洛阳电光设备研究所 | The Method of Adjustment and imaging device of three view field confocal planes in infrared imagery technique |
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| CN111426390A (en) * | 2020-04-01 | 2020-07-17 | 济南和普威视光电技术有限公司 | Double-view-field thermal infrared imager and view field switching method thereof |
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