CN103630245A - Multielement linear array high-speed heat distribution imaging detector - Google Patents
Multielement linear array high-speed heat distribution imaging detector Download PDFInfo
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- CN103630245A CN103630245A CN201310673792.4A CN201310673792A CN103630245A CN 103630245 A CN103630245 A CN 103630245A CN 201310673792 A CN201310673792 A CN 201310673792A CN 103630245 A CN103630245 A CN 103630245A
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Abstract
The invention belongs to the technical field of high-speed running railway vehicle safety detection, provides a multielement linear array high-speed heat distribution imaging detector and solves the problems that linear trajectory scanning for detecting heating fault of a high-speed moving object is small in scanning range and the existing technique of using multiple probes is complex and high in cost. According to the scheme, the multielement linear array high-speed heat distribution imaging detector is characterized in that the high-speed moving object under detection reflects mixed light of visible light and infrared light; the visible light is filtered from the mixed light by an optical filter lens, and the filtered mixed light is then focused to a photosensitive face of a multielement linear array photosensitive element; an electric signal from the multielement linear array photosensitive element is amplified by a multi-signal amplifier unit; a multi-signal output adapter outputs multiple parallel analog signals; a multi-offset constant current source powers the multielement linear array photosensitive element to work; a three-stage refrigerating control unit controls operating temperature of the multielement linear array photosensitive element; a signal drift control unit suppresses drifting.
Description
Technical field
The present invention relates to a kind of heating accident sniffer, belong to high-speed cruising rolling stock safety detection technology field.
Background technology
The rolling stock operation portion of high-speed cruising or the detection of swiftly passing object heating accident are also confined to line tracking scan mode both at home and abroad at present, the object scope that can scan is light belt of the wide 40mm in 1m place, heat generating spot beyond light belt cannot be surveyed, also have and attempt the use simultaneously of a plurality of detection probes, but its scanning strip cannot become continuously thermal map in region, and greatly increase complexity and the maintainability of equipment.Even if general thermal imaging apparatus can be combined heat distribution with photo-optics, intuitively show the heat distribution situation of testee, but it can only carry out accurate detection to stationary body or the very low moving object of speed, and also expensive, should not promote.Be not suitable for the detection demand of the rolling stock heating accident of high-speed cruising.
Summary of the invention
The present invention seeks to use single probe detection position limited in order to solve existing equipment, use the complicated problem such as expensive of many probe technologies.
Polynary linear array high speed heat distribution imaging detector of the present invention, it comprises filter glass, optical lens, polynary linear array light sensor, multiple signals amplifying unit, multiple signals o adapter, multichannel biasing constant current source, the cold control module of three tier structure and signal drift control module;
The object under test reflect visible light of high-speed motion and the mixed light beam of infrared light;
The mixed light beam of described visible ray and infrared light is after filter glass filtering visible ray, and output infrared beam is incident on the photosurface of polynary linear array light sensor through optical lens;
The electrical signal of polynary linear array light sensor is connected with the input end of multiple signals amplifying unit;
The amplifying signal output terminal of multiple signals amplifying unit is by multiple signals o adapter output multi-channel Parallel Simulation signal;
Multichannel biasing constant current source provides working power for polynary linear array light sensor;
The working temperature control signal output terminal of the cold control module of three tier structure is connected with the working temperature control signal input end of polynary linear array light sensor;
The temperature signal drift correction signal input output end of signal drift control module is connected with the temperature signal drift correction signal input output end of multiple signals amplifying unit.
Filter glass is visible ray bandpass filtering zinc sulphide eyeglass, optical lens is the two infrared humorous diffraction lenss of sphere in wide visual field, the mixed light beam of visible ray and infrared light is incident to visible ray bandpass filtering zinc sulphide eyeglass, visible ray bandpass filtering zinc sulphide eyeglass output infrared beam, and be incident to the two infrared humorous diffraction lenss of sphere in wide visual field, the two infrared humorous diffraction lenss of sphere in wide visual field are exported the surface temperature image of high-speed moving object to be measured, and focus on the photosurface of polynary linear array light sensor.
Advantage of the present invention: adopt visible ray bandpass filtering zinc sulphide eyeglass to filter a large amount of visible rays, add the insensitivity of this eyeglass to infrared light, reduced the decay of infrared light, it is wide that the two infrared humorous diffraction lenss of sphere in wide visual field have visual field, the advantage that light gathering efficiency is high, spatial contrast degree is high, therefore, can increase the area that is detected object, improve the accuracy that is detected object; Polynary linear array arrangement light activated element photosensitivity after three tier structure is cold is strong, and thermoelectric effect time constant is little, can adapt to the detection of (≤380km/h) mobile object at a high speed, and polynary signal cross-talk is low; Bias current adopts constant current source mode, element signal stable output is adjustable, reduce noise jamming, multichannel independent signal amplifies, avoid signal cross-talk and decay, make acquisition system simplicity of design, in amplifying circuit, quote the characteristic of logarithmic amplification, make the characteristic curve of whole detector level and smooth, curvilinear equation is controlled in secondary; The present invention adopts drift controller, reduces the impact of system drifting on output; This detector adopts multichannel characteristic, and high-speed mobile object detection is had to certain redundancy.
Accompanying drawing explanation
Fig. 1 is the theory diagram of polynary linear array high speed heat distribution imaging detector of the present invention;
Fig. 2 is the physical circuit figure of multiple signals amplifying unit;
Fig. 3 is the physical circuit figure of multichannel biasing constant current source;
Fig. 4 is the physical circuit figure of the cold control module of three tier structure;
Fig. 5 be drift rejective amplifier in signal drift control module and multiple signals amplifying unit and non-linear logarithmic amplifier and physical circuit connection layout.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 3, polynary linear array high speed heat distribution imaging detector described in present embodiment, it comprises filter glass 1, optical lens 2, polynary linear array light sensor 3, multiple signals amplifying unit 4, multiple signals o adapter 5, multichannel biasing constant current source 6, the cold control module 7 of three tier structure and signal drift control module 8;
The object under test reflect visible light of high-speed motion and the mixed light beam of infrared light;
The mixed light beam of described visible ray and infrared light is after filter glass 1 filtering visible ray, and output infrared beam is incident on the photosurface of polynary linear array light sensor 3 through optical lens 2;
The electrical signal of polynary linear array light sensor 3 is connected with the input end of multiple signals amplifying unit 4;
The amplifying signal output terminal of multiple signals amplifying unit 4 is by multiple signals o adapter 5 output multi-channel Parallel Simulation signals;
Multichannel biasing constant current source 6 is carried polynary linear array light sensor 3 provides working power;
The working temperature control signal output terminal of the cold control module 7 of three tier structure is connected with the working temperature control signal input end of polynary linear array light sensor 3;
The temperature signal drift correction signal input output end of signal drift control module 8 is connected with the temperature signal drift correction signal input output end of multiple signals amplifying unit 4.
The core parts of multichannel biasing constant current source 6 are the accurate bandgap voltage reference of ADR02, OP177 operational amplifier.The physical circuit figure of multichannel biasing constant current source 6 as shown in Figure 3.The RY1 of multichannel biasing constant current source 6 represents polynary linear array light sensor.Output terminal VINA1 connects multiple signals amplifying unit 4.Multichannel biasing constant current source 6 provides power supply for polynary linear array light sensor, so that export target temperature signal.
Polynary linear array light sensor 3 adopts mercury cadmium telluride synthetic material as core light photosensitive elements material, by precision, cut, making individual unit face is 0.25 * 0.25mm, quaternary (or eight yuan) becomes line style to arrange, unit interval 0.20mm, after encapsulation, carry out three level semiconductor refrigeration, the refrigeration degree of depth is less than-60 ℃, the luminous energy response time is less than 2 μ s, after optical lens 2 focal imagings, the cumulative width 240mm of 1m place body surface temperature focal imaging to polynary linear array light sensor 3, object is scanned a wide thermal map image-tape of rear formation 240mm, according to actual needs, intercept a part for this thermal map image-tape as processing object, after special software conversion, reach heat distribution imaging object, by associated hot imaging software, process output.
This detector is when reality is used, connect multi pass acquisition system and embedded processing computing machine, multiple signals o adapter 5 parallel output multichannel analog signals are by multi pass acquisition system Real-time Collection, data after collection are processed by embedded processing Computer Analysis, the actual temperature of the object under test of output high-speed motion.
Embodiment two: present embodiment is described further embodiment one, filter glass 1 is visible ray bandpass filtering zinc sulphide eyeglass, optical lens 2 is the two infrared humorous diffraction lenss of sphere in wide visual field, the mixed light beam of visible ray and infrared light is incident to visible ray bandpass filtering zinc sulphide eyeglass, visible ray bandpass filtering zinc sulphide eyeglass output infrared beam, and be incident to the two infrared humorous diffraction lenss of sphere in wide visual field, the two infrared humorous diffraction lenss of sphere in wide visual field are exported the surface temperature image of high-speed moving object to be measured, and focus on the photosurface of polynary linear array light sensor 3.
High-speed moving object to be measured easily generates heat, the temperature of high-speed moving object to be measured is higher, the light intensity of the infrared light that it sends is stronger, the high-speed moving object to be measured of heating is the infrared light supply shown in Fig. 1, these infrared lights are mixing visible ray, the mixed light beam of the two is filtered by filter glass 1, focuses on the photosurface of polynary linear array light sensor 3 by optical lens 2.
Adopt visible ray bandpass filtering zinc sulphide eyeglass to filter a large amount of visible rays, add the insensitivity of this eyeglass to infrared light, reduced the decay of infrared light, it is wide that the two infrared humorous diffraction lenss of sphere in wide visual field have visual field, the advantage that light gathering efficiency is high, spatial contrast degree is high, therefore, increase the area that is detected object, improve the accuracy that is detected object.
Embodiment three: present embodiment is described below in conjunction with Fig. 2 and Fig. 5, present embodiment is described further embodiment one, multiple signals amplifying unit 4 comprises small-signal primary amplifier 4-1, drift rejective amplifier 4-2 and non-linear logarithmic amplifier 4-3, the output terminal of small-signal primary amplifier 4-1 is connected with the input end of drift rejective amplifier 4-2, and the output terminal of drift rejective amplifier 4-2 is connected with the input end of non-linear logarithmic amplifier 4-3.
It is acp chip that small-signal primary amplifier 4-1 adopts AD620 operational amplifier.
The output terminal OUTA3 of non-linear logarithmic amplifier 4-3, as the signal output of this detector, connects host computer and carries out signals collecting.
The output signal of 4 pairs of polynary linear array light sensors 3 of multiple signals amplifying unit is carried out the amplification of 40 times.The physical circuit figure of signal amplification unit 4 as shown in Figure 2.
The single channel output signal that drift rejective amplifier 4-2 arranges light activated element 3 to polynary linear array after small-signal primary amplifier 4-1 amplifies carries out the amplification of 4 times and combines with feedback equalization circuit 8 revising measuring temperature basis point and the static drift that suppresses amplifying circuit.
Drift rejective amplifier 4-2 be take the signal amplification circuit that U2B-OP07 is main body.
Non-linear logarithmic amplifier 4-3 arranges light activated element 3 single channel output signals to the polynary linear array after twin-stage amplifies and carries out non-linear amplification output, each temperature section signal output sensitivity of balance.
Non-linear logarithmic amplifier 4-3 be take the non-linear amplifying circuit of signal that U4-OP07 is main body.
The input end VINA1 of small-signal primary amplifier 4-1 connects the output terminal VINA1 of multichannel biasing constant current source 6, and small-signal is the input end VINA2 of the output terminal OUTA1 connection drift rejective amplifier 4-2 of amplifier 4-1 just.
The input end VINA2 of drift rejective amplifier 4-2 connects the output terminal OUTA1 of small-signal primary amplifier 4-1, and the output terminal OUTA2 of drift rejective amplifier 4-2 connects the input end VINA3 of non-linear logarithmic amplifier 4-3.The lead-out terminal OUTB of drift rejective amplifier 4-2 connects the lead-out terminal OUTB of feedback equalization circuit 8;
The input end VINA3 of non-linear logarithmic amplifier 4-3 connects the output terminal OUTA2 of drift rejective amplifier 4-2, and the output terminal OUTA3 of non-linear logarithmic amplifier 4-3 connects o adapter 5; The output terminal of non-linear logarithmic amplifier 4-3, as the signal output of this detector, connects host computer and carries out signals collecting;
Embodiment four: present embodiment is described below in conjunction with Fig. 4, present embodiment is described further embodiment one, and the cold control module 7 of three tier structure comprises derived reference signal 7-1, first temperature modulated amplifier 7-2, rear class signal amplifier 7-3, resistance R 20 and resistance R 4;
The reference temperature signal output terminal of derived reference signal 7-1 is connected with the reference temperature signal input end of the temperature modulated amplifier 7-2 of unit by resistance R 20;
The warm modulated amplifier 7-2 of unit gathers the working temperature of polynary linear array light sensor 3;
The amplifying signal output terminal of the warm modulated amplifier 7-2 of unit is connected with the input end of rear class signal amplifier 7-3;
Rear class signal amplifier 7-3 is by the rear component temperature value Vrt of resistance R 4 output modulation.
Polynary linear array arrangement light activated element photosensitivity after three tier structure is cold is strong, and thermoelectric effect time constant is little, can adapt to the detection of (≤380km/h) mobile object at a high speed, and polynary signal cross-talk is low.
In the warm modulated amplifier 7-2 of unit, be provided with resistance R t, resistance R t is the measurement resistance signal of the thermistor in polynary linear array light sensor 3, gather this signal, it is the working temperature signal of polynary linear array light sensor 3, component temperature value Vrt after this signal is exported modulation after cold control module 7 modulation of three tier structure is the unit's temperature voltage signal after modulation.
Embodiment five: below in conjunction with Fig. 5, present embodiment is described, present embodiment is described further embodiment one, signal drift control module 8 is feedback equalization circuit;
The balance corrected signal input of signal drift control module 8, output terminal are connected with input, the output terminal of the drift rejective amplifier 4-2 of multiple signals amplifying unit 4.
Claims (6)
1. many yuan of linear array high speed heat distribution imaging detectors, it is characterized in that, it comprises filter glass (1), optical lens (2), polynary linear array light sensor (3), multiple signals amplifying unit (4), multiple signals o adapter (5), multichannel biasing constant current source (6), the cold control module of three tier structure (7) and signal drift control module (8);
The object under test reflect visible light of high-speed motion and the mixed light beam of infrared light;
The mixed light beam of described visible ray and infrared light is after filter glass (1) filtering visible ray, and output infrared beam is incident on the photosurface of polynary linear array light sensor (3) through optical lens (2);
The electrical signal of polynary linear array light sensor (3) is connected with the input end of multiple signals amplifying unit (4);
The amplifying signal output terminal of multiple signals amplifying unit (4) is by multiple signals o adapter (5) output multi-channel Parallel Simulation signal;
Multichannel biasing constant current source (6) provides working power for polynary linear array light sensor (3);
The working temperature control signal output terminal of the cold control module of three tier structure (7) is connected with the working temperature control signal input end of polynary linear array light sensor (3);
The temperature signal drift correction signal input output end of signal drift control module (8) is connected with the temperature signal drift correction signal input output end of multiple signals amplifying unit (4).
2. polynary linear array high speed heat distribution imaging detector according to claim 1, it is characterized in that, filter glass (1) is visible ray bandpass filtering zinc sulphide eyeglass, optical lens (2) is the two infrared humorous diffraction lenss of sphere in wide visual field, the mixed light beam of visible ray and infrared light is incident to visible ray bandpass filtering zinc sulphide eyeglass, visible ray bandpass filtering zinc sulphide eyeglass output infrared beam, and be incident to the two infrared humorous diffraction lenss of sphere in wide visual field, the two infrared humorous diffraction lenss of sphere in wide visual field are exported the surface temperature image of high-speed moving object to be measured, and focus on the photosurface of polynary linear array light sensor (3).
3. polynary linear array high speed heat distribution imaging detector according to claim 1, is characterized in that, polynary linear array light sensor (3) adopts mercury cadmium telluride synthetic material as core light photosensitive elements material.
4. polynary linear array high speed heat distribution imaging detector according to claim 1, it is characterized in that, multiple signals amplifying unit (4) comprises small-signal primary amplifier (4-1), drift rejective amplifier (4-2) and non-linear logarithmic amplifier (4-3), the output terminal of small-signal primary amplifier (4-1) is connected with the input end of drift rejective amplifier (4-2), and the output terminal of drift rejective amplifier (4-2) is connected with the input end of non-linear logarithmic amplifier (4-3).
5. polynary linear array high speed heat distribution imaging detector according to claim 4, is characterized in that, it is acp chip that small-signal primary amplifier (4-1) adopts AD620 operational amplifier.
6. polynary linear array high speed heat distribution imaging detector according to claim 1, it is characterized in that, the cold control module of three tier structure (7) comprises derived reference signal (7-1), first temperature modulated amplifier (7-2), rear class signal amplifier (7-3), resistance R 20 and resistance R 4;
The reference temperature signal output terminal of derived reference signal (7-1) is connected with the reference temperature signal input end of first temperature modulated amplifier (7-2) by resistance R 20;
The warm modulated amplifier of unit (7-2) gathers the working temperature of polynary linear array light sensor (3);
The amplifying signal output terminal of the warm modulated amplifier of unit (7-2) is connected with the input end of rear class signal amplifier (7-3);
Rear class signal amplifier (7-3) is by the rear component temperature value Vrt of resistance R 4 output modulation.
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| CN108603791A (en) * | 2016-01-28 | 2018-09-28 | Ams传感器英国有限公司 | A kind of IR detector arrays equipment |
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Application publication date: 20140312 |