CN108983304A - A kind of precision infrared photoelectric sensor - Google Patents
A kind of precision infrared photoelectric sensor Download PDFInfo
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- CN108983304A CN108983304A CN201810851120.0A CN201810851120A CN108983304A CN 108983304 A CN108983304 A CN 108983304A CN 201810851120 A CN201810851120 A CN 201810851120A CN 108983304 A CN108983304 A CN 108983304A
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Abstract
The present invention relates to sensor technical fields, specifically, it is related to a kind of accurate infrared photoelectric sensor, shell including cylindrical tube shape, and the infrared receiver and infrared emission unit of arrangement inside the shell, the infrared receiver and infrared emission unit are disposed axially in shell, and each unit is via shell, the filter for being arranged in case nose and the tail insert group for being arranged in outer casing back are shaped to the accurate infrared photoelectric sensor, so, the present invention provides high-precision infrared photoelectric sensors, using chemical industry medical treatment, to the distance of product surface in industrial production product manufacturing, density, the measurement of quantity, the surface parameter of object within 10mm can be wherein measured after transducer calibration, its precision is up to 0.1um, it especially can measurement such as rubber seal for flexible material, fiber stick etc..
Description
Technical field:
The present invention relates to sensor technical fields, and in particular, to a kind of precision infrared photoelectric sensor.
Background technique:
Sensor (English name: transducer/sensor) is a kind of detection device, can experience measured letter
Breath, and the information that can will be experienced are for conversion into electric signal or the information output of other required forms, according to certain rules to meet
The requirement such as transmission, processing, storage, display, record and control of information.The characteristics of sensor includes: micromation, digitlization, intelligence
Energyization, multifunction, systematization, networking.It is to realize the automatic primary link detected and automatically control.The presence of sensor
And development, it allows object to have the sense organs such as tactile, taste and smell, object is allowed slowly to become to have lived.It is basic generally according to it
Perceptional function is divided into temperature-sensitive element, light-sensitive element, gas sensor, force sensing element, magneto sensor, dew cell, acoustic sensor, puts
Ten major class such as radiation sensor, color sensor and the quick element of taste.
Sensor is widely used in social development and the every field of human lives, as industrial automation, agricultural modernization,
Space technology, military engineering, robot technology, development of resources, hydrospace detection, environmental monitoring, security, medical diagnosis, friendship
Logical transport, household electrical appliance etc..According to " Chinese sensor manufacturing development prospect and the investment forecasting of the publication of prediction industrial research institute
Analysis report prediction " display, in recent years, domestic sensor application is mainly distributed on mechanical equipment manufacture, household electrical appliance, scientific instrument
The fields such as instruments and meters, health care, communications electronics and automobile.The arrival of new technology revolution, the world initially enter the information age.
During using information, first have to solve seeks to obtain accurately and reliably information, and sensor be obtained from so and
The main path and means of information in production field.Particle World, to observe the cosmogony up to hundreds of thousands of years on longitudinal direction,
It is short to the moment reaction of s.Play a significant role in addition, having also appeared to in-depth substance understanding, developing new energy, new material etc.
Various extreme technical research, such as superhigh temperature, ultralow temperature, super-pressure, ultrahigh vacuum, ultrastrong magnetic field, superweak magnetic field.Obviously,
The information that a large amount of human sensories can not directly acquire is obtained, the sensor not being adapted is impossible.Many basis sections
The obstacle for learning research, is that the acquisition of object information has difficulties first, and some new mechanism and highly sensitive detection pass
The appearance of sensor frequently can lead to the breakthrough in the field.The development of some sensors, often some frontier branches of science are developed
Pioneer.Sensor penetrates into such as industrial production, space development, hydrospace detection, environmental protection, resource investigation, medicine already and examines
Disconnected, bioengineering, the even extremely general field of historical relic's protection etc..It is no exaggeration to say that being arrived great from boundless and indistinct space
Vast ocean, so that the engineering system of various complexity, almost each modernization project, all be unable to do without various sensings
Device.It can be seen that important function of the sensor technology in terms of developing the economy, pushing social progress, is fairly obvious.
Summary of the invention:
The present invention overcomes the deficiencies of existing technologies, and provides a kind of accurate infrared photoelectric sensor.
The technical problems to be solved by the invention are solved using following technical scheme: a kind of precision infrared photoelectric sensor,
The infrared receiver and infrared emission unit of shell and arrangement inside the shell including cylindrical tube shape, the infrared receiver
Unit and infrared emission unit are disposed axially in shell, and each unit via shell, be arranged in the filter and cloth of case nose
The tail insert group set in outer casing back is shaped to the accurate infrared photoelectric sensor.
Preferably, the infrared receiver includes phototube stent and the photoelectric tube group with phototube stent cooperation
Part, the photoelectricity tube assembly includes fixed ring, the photoelectric tube being arranged circumferentially on one end face of fixed ring, and the photoelectric tube is 4,
The phototube stent is circumferentially with the accommodation groove for accommodating photoelectric tube, and each photoelectric tube is embedded in accommodation groove and via conducting wire
Signal export will be received, in this way, itself constituting an AND gate circuit can be improved the sensing capability to ambient light, will be also improved
The redundancy of circuit only declines the sensitivity of system having a photoelectricity tube failure, whole system will not be made to fail.
Preferably, the infrared emission unit includes LED support, and the LED support is arranged circumferentially in fixed ring far from light
It is equipped with through-hole at the center of one end of fulgurite, the fixed ring and phototube stent, through-hole and light guide optical fiber in fixed ring
One end connection, the light guide optical fiber other end protrudes into the through-hole of phototube stent, the LED support far from photoelectric tube one
End is additionally provided with LED light accommodation groove, LED light is additionally provided in the LED light accommodation groove, the LED light is connected with circuit board assemblies, institute
It states circuit board assemblies and is additionally provided with potentiometer far from one end of photoelectric tube, in this way, after infrared emission unit is in infrared receiver
It is compact that portion more tends to structure, infrared light through light guide optical fiber from 4 to after export among reception pipe with 18 degree of radiation angle uniformly to
Outer transmitting, fibre diameter only have 1mm. or so, and light efficiency is up to 90% after emitted pipe focussed collimated.
Preferably, the circuit of the infrared emission unit includes diode Dg2, and with diode Dg2 reverse parallel connection
Diode Dg1, the diode Dg2 external power supply, in this way, diode Dg1, diode Dg2 are infrared emission part, diode
Dg1 is that the reverse protection pipe of diode Dg2 can prevent the high back voltage of diode Dg2 from puncturing, and needs outer connecting resistance current limliting or modulation
Limitation power consumption protection infrared tube does not exceed safe handling power bracket.
Preferably, the circuit of the infrared receiver includes 24V current source, and the one of the 24V current source and resistance RL
End connection, the other end of resistance RL connects with node C, the one end with resistance R1 respectively node C, the collector of triode D1~4,
The collector of triode Q1 connects, and the resistance R1 other end connects with the base stage of one end of adjustable resistance RC, triode Q2 respectively
It connects, the emitter of triode D1~4 is connected with node M, and the other end of the adjustable resistance RC passes through node M and triode
The base stage of Q1 connects, and node M is also connected with one end of resistance R2, and the other end of the resistance R2 and the collector of triode Q2 connect
It connects, the emitter ground connection of triode Q2, the emitter of the triode Q1 and the input terminal of negative-feedback circuit connect, the feedback
The output end of circuit is grounded.
Preferably, the negative-feedback circuit includes resistance R6, resistance R7, resistance R5 and capacitor C1, the resistance R6 with
Resistance R7 connects to form branch one, and the resistance R5 connects to form branch two with capacitor C1, and the branch one and branch two are in parallel,
In this way, triode D1-D4 is the photoelectric tube on four direction, resistance RL is the load resistance of circuit, and normal circuit lead is by C point
It is drawn with grounding point.Constitute two-wire system sensor；Resistance R1 is that the quiescent biasing resistance of entire circuit is triode Q1 and three poles
Pipe Q2, which provides bias current, makes Q1 work in lightly conducting state；The Static Electro of the adjustable triode Q1 of adjustable resistance Rc one side
Stream, also adjustable photoelectric tube flows into the branch current size of triode Q1 to another reverse side.Therefore adjusting adjustable resistance Rc can be with
The dynamic current size for changing and flowing into triode Q1 is adjusted, and then adjusts the gain size of the signal output of triode Q1.Resistance
R2 is the collector current limliting load resistance of triode Q2.Resistance R5, resistance R6, resistance R7, capacitor C1 are the cross, straight of triode Q1
Galvanic electricity stream negative feedback resistor can stablize the operating point of triode Q1.The circuit topology can be the mains ripple the case where
Under, the output amplitude of signal remains unchanged, and gain can be to be continuously adjusted in a certain range；Resistance R6, resistance R7 are three poles
The DC current negative feedback resistor of pipe Q1, resistance R5, capacitor C1 are the AC regeneration bypasses of triode Q1.
In the application, compact twin wire sensor circuit, it is ensured that in the case where mains ripple, signal
Amplitude remain unchanged, gain can be to be continuously adjusted in a certain range, and the output signal of this circuit can pass through simple electricity
Hold coupling to choose the photosignal of permanent width, but the amplitude for detecting signal is not influenced by supply voltage.
Working principle:
The infrared light that LED light issues after power-up is after light guide optical fiber is transmitted to optical filter with 18 degree of radiation angle to outgoing
It penetrates, transmitting unit can all be modulated in number or analog domain, and the infrared signal of direct projection or reflection is filtered out through 700nm cut-off filter
It is received after visible light interference by photoelectric tube, through the linear variable current source signal of circuit conversion, through turning after circuit detects
Get out parameter, the adjustable circuit parameter of adjustable potentiometer at sensor rear portion in return, the photoelectricity to Calibration Circuit transmits letter
Number, this circuit can form correlation type infrared photoelectric sensor, can also form reflection-type infrared photoelectric sensor.Again because of sensing
Device itself has transmitting and receives circuit, and reliable and stable counter-measure is constituted under conditions of different codings are added to penetrating
Type sensor, using that external staff can be effectively prevent to invade in a closed channel, infrared receiving terminal in use be can be used
Convenient two-wire system lead-out wire mode reliably uses this product.
Compared with prior art, the application has the beneficial effect that
1, four-way photoelectric tube design makes photoelectric tube that can uniformly receive the infrared light that LED light is launched, and improves photoelectric tube
Sensitivity, so that a detection is become face average detected.
2, in two-wire system perseverance gain control circuit topology and structure design, the circuit design of two-wire system can make supply voltage
The holding of its signal gain is stablized constant when variation.It can make the transmission function of the electrical-optical-electrical of entire sensor, LINEAR CONTINUOUS can
It adjusts, the work that circuit can also be made more stable by this topology is in the state of Low Drift Temperature.
3, the present invention provides high-precision infrared photoelectric sensors, using right in chemical industry medical treatment, industrial production product manufacturing
The measurement of the distance, density, quantity of product surface can wherein measure the surface ginseng of object within 10mm after transducer calibration
Number, precision, especially can measurements such as rubber seal, fiber stick etc. for flexible material up to 0.1um.
Detailed description of the invention:
Fig. 1 is schematic structural view of the invention；
Fig. 2 is infrared receiver of the present invention and infrared emission unit circuit diagram；
Wherein: 10~shell；20~infrared receiver unit；21~phototube stent；221~fixed ring；222~photoelectricity
Pipe；223~accommodation groove；30~infrared emission unit；31~LED support；32~light guide optical fiber；33~LED light accommodation groove；34~
Potentiometer；40~filter；50~tail is inserted.
Specific embodiment:
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiment is closed, the present invention is furture elucidated.
As shown in Figure 1, a kind of precision infrared photoelectric sensor, shell 10 including cylindrical tube shape and it is arranged in shell
Infrared receiver 20 and infrared emission unit 30 in 10, infrared receiver 20 and infrared emission unit 30 are disposed axially in
In shell 10, and each unit is via shell 10, the tail that is arranged in the filter 40 of 10 front end of shell and is arranged in 10 rear end of shell is inserted
50 groups are shaped to the accurate infrared photoelectric sensor.
As shown in Figure 1, infrared receiver 20 includes phototube stent 21 and the photoelectricity with the cooperation of phototube stent 21
Tube assembly, photoelectricity tube assembly include fixed ring 221, the photoelectric tube 222 being arranged circumferentially on 221 1 end face of fixed ring, photoelectric tube
222 be 4, and phototube stent 21 is circumferentially with the accommodation groove 223 for accommodating photoelectric tube 222, and each photoelectric tube 222, which is embedded, to be held
Signal export will be received by setting in slot 223 and via conducting wire, in this way, itself constituting an AND gate circuit can be improved to ambient light
Sensing capability, also improving the redundancy of circuit only declines the sensitivity of system having a photoelectric tube 222 to fail,
Whole system will not be made to fail.
As shown in Figure 1, infrared emission unit 30 includes LED support 31, it is remote that LED support 31 is arranged circumferentially in fixed ring 221
Through-hole, the through-hole in fixed ring 221 are equipped at the center of one end from photoelectric tube 222, fixed ring 221 and phototube stent 21
It is connected with one end of light guide optical fiber 32,32 other end of light guide optical fiber protrudes into the through-hole of phototube stent 21, and LED support 31 is separate
One end of photoelectric tube 222 is additionally provided with LED light accommodation groove 33, and LED light, LED light and circuit board group are additionally provided in LED light accommodation groove 33
Part connection, circuit board assemblies are additionally provided with potentiometer 34 far from one end of photoelectric tube 222, in this way, infrared emission unit 30 is in red
It is compact that outer 20 rear portion of receiving unit more tends to structure, infrared light through light guide optical fiber 32 from 4 among photoelectric tube 222 export after with
18 degree of radiation angle uniformly launches outward, and fibre diameter only has 1mm. or so, and light efficiency is reachable after LED light focussed collimated
90%.
As shown in Fig. 2, the circuit of infrared emission unit includes diode Dg2, and two with diode Dg2 reverse parallel connection
Pole pipe Dg1, diode Dg2 external power supply, in this way, diode Dg1, diode Dg2 are infrared emission parts, diode Dg1 is
The reverse protection pipe of diode Dg2 can prevent the high back voltage of diode Dg2 from puncturing, and need outer connecting resistance current limliting or modulation limitation function
Consumption protection infrared tube does not exceed safe handling power bracket.
As shown in Fig. 2, the circuit of infrared receiver includes 24V current source, one end company of 24V current source and resistance RL
It connects, the other end of resistance RL is connected with node C, the one end with resistance R1 respectively node C, the collector of triode D1~4, three poles
The collector of pipe Q1 connects, and the resistance R1 other end is connected with the base stage of one end of adjustable resistance RC, triode Q2 respectively, triode
The emitter of D1~4 is connected with node M, and the other end of adjustable resistance RC is connect by node M with the base stage of triode Q1, node
M is also connected with one end of resistance R2, and the other end of resistance R2 is connected with the collector of triode Q2, and the emitter of triode Q2 connects
Ground, the emitter of triode Q1 and the input terminal of negative-feedback circuit connect, the output end ground connection of feed circuit.
As shown in Fig. 2, negative-feedback circuit includes resistance R6, resistance R7, resistance R5 and capacitor C1, resistance R6 and resistance R7
Series connection forms branch one, and resistance R5 connects to form branch two with capacitor C1, and branch one and branch two are in parallel, in this way, triode D1-
D4 is the photoelectric tube on four direction, and resistance RL is the load resistance of circuit, and normal circuit lead is drawn by C point and grounding point.
Constitute two-wire system sensor；Resistance R1 is that the quiescent biasing resistance of entire circuit provides biased electrical for triode Q1 and triode Q2
Stream makes Q1 work in lightly conducting state；The quiescent current of the adjustable triode Q1 of adjustable resistance Rc one side, another reverse side
Adjustable photoelectric tube flows into the branch current size of triode Q1.Therefore it adjusts the adjustable change of adjustable resistance Rc and flows into three
The dynamic current size of pole pipe Q1, and then adjust the gain size of the signal output of triode Q1.Resistance R2 is triode Q2's
Collector current limliting load resistance.Resistance R5, resistance R6, the AC and DC electric current negative-feedback electricity that resistance R7, capacitor C1 are triode Q1
Resistance can stablize the operating point of triode Q1.The circuit topology can be in the case where mains ripple, the output of signal
Amplitude remains unchanged, and gain can be to be continuously adjusted in a certain range；Resistance R6, resistance R7 are that the DC current of triode Q1 is negative
Feedback resistance, resistance R5, capacitor C1 are the AC regeneration bypasses of triode Q1.
In the application, compact twin wire sensor circuit, it is ensured that in the case where mains ripple, signal
Amplitude remain unchanged, gain can be to be continuously adjusted in a certain range, and the output signal of this circuit can pass through simple electricity
Hold coupling to choose the photosignal of permanent width, but the amplitude for detecting signal is not influenced by supply voltage.
Working principle:
The infrared light that LED light issues after power-up is after light guide optical fiber 32 is transmitted to filter 40 with 18 degree of radiation angle to outgoing
It penetrates, transmitting unit can all be modulated in number or analog domain, and the infrared signal of direct projection or reflection is filtered through 700nm cut-off filter 40
It is received after being interfered except visible light by photoelectric tube 222, through the linear variable current source signal of circuit conversion, after circuit detects
It is converted to obtain parameter, the adjustable circuit parameter of adjustable potentiometer at sensor rear portion, the photoelectric transfer to Calibration Circuit
Delivery function, this circuit can form correlation type infrared photoelectric sensor, can also form reflection-type infrared photoelectric sensor.And because
Sensor itself has transmitting and receives circuit, and reliable and stable counter-measure is constituted under conditions of different codings are added
Correlation type sensor, using external staff being effectively prevent to invade in a closed channel, infrared receiving terminal in use can be with
Two-wire system lead-out wire mode easy to use reliably uses this product.
Performance test:
A kind of accurate infrared photoelectric sensor provided by the present application is tested for the property, test result is as shown in table 1:
Table 1
Basic principles and main features and the features of the present invention of the invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement is both fallen in the range of claimed invention.The scope of protection of present invention is by appended claims
And its equivalent thereof.
Claims (6)
1. a kind of precision infrared photoelectric sensor, which is characterized in that shell including cylindrical tube shape and arrangement are inside the shell
Infrared receiver and infrared emission unit, the infrared receiver and infrared emission unit are disposed axially in shell, and
Each unit via shell, be arranged in the filter of case nose and be arranged in the tail insert group of outer casing back to be shaped to the precision infrared
Photoelectric sensor.
2. precision infrared photoelectric sensor according to claim 1, which is characterized in that the infrared receiver includes light
Fulgurite bracket and the photoelectricity tube assembly cooperated with phototube stent, the photoelectricity tube assembly includes fixed ring, is arranged circumferentially in
Photoelectric tube on one end face of fixed ring, the photoelectric tube are 4, and the phototube stent is circumferentially with for accommodating photoelectric tube
Accommodation groove, each photoelectric tube are embedded in accommodation groove and will receive signal export via conducting wire.
3. precision infrared photoelectric sensor according to claim 1, which is characterized in that the infrared emission unit includes
LED support, the LED support are arranged circumferentially in the one end of fixed ring far from photoelectric tube, the fixed ring and phototube stent
Through-hole is equipped at center, the through-hole in fixed ring is connected with one end of light-conductive optic fibre, and the light-conductive optic fibre other end protrudes into light
In the through-hole of fulgurite bracket, the LED support is additionally provided with LED light accommodation groove, the LED light accommodation groove far from one end of photoelectric tube
It is inside additionally provided with LED light, the LED light is connected with circuit board assemblies, and the circuit board assemblies are additionally provided with far from one end of photoelectric tube
Potentiometer.
4. precision infrared photoelectric sensor according to claim 3, which is characterized in that the circuit of the infrared emission unit
Including diode Dg2, and the diode Dg1 with diode Dg2 reverse parallel connection, the diode Dg2 external power supply.
5. precision infrared photoelectric sensor according to claim 2, which is characterized in that the circuit of the infrared receiver
Including 24V current source, the 24V current source is connected with one end of resistance RL, and the other end of resistance RL is connected with node C, node C
Respectively with one end of resistance R1, the collector connection of the collectors of triode D1~4, triode Q1, the resistance R1 other end
It being connected respectively with the base stage of one end of adjustable resistance RC, triode Q2, the emitter of triode D1~4 is connected with node M,
The other end of the adjustable resistance RC is connect by node M with the base stage of triode Q1, and node M also connects with one end of resistance R2
It connects, the other end of the resistance R2 is connected with the collector of triode Q2, the emitter ground connection of triode Q2, the triode Q1
Emitter and the input terminal of negative-feedback circuit connect, the output end of feed circuit ground connection.
6. precision infrared photoelectric sensor according to claim 5, which is characterized in that the negative-feedback circuit includes resistance
R6, resistance R7, resistance R5 and capacitor C1, the resistance R6 connect to form branch one with resistance R7, the resistance R5 and capacitor
C1 connects to form branch two, and the branch one and branch two are in parallel.
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| CN201810851120.0A CN108983304B (en) | 2018-07-30 | 2018-07-30 | Precise infrared photoelectric sensor |
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