CN208937726U - A kind of combined type is double to penetrating photoelectric sensor and corresponding rays safety detection apparatus - Google Patents
A kind of combined type is double to penetrating photoelectric sensor and corresponding rays safety detection apparatus Download PDFInfo
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Abstract
It is double to penetrating photoelectric sensor and corresponding rays safety detection apparatus that the utility model discloses a kind of combined types.The photoelectric sensor includes A end module and B end module, and A end module and B end module respectively include transmit circuit and receive circuit；The transmit circuit of A end module is formed all the way to penetrating Photoelectric Detection for issuing modulation light to the reception circuit for being incident upon B end module；The transmit circuit of B end module forms another way to penetrating Photoelectric Detection for issuing modulation light to the reception circuit for being incident upon A end module；The reception circuit opposite direction of A end module and B end module arrangement, keeps two-way contrary to the modulation light for penetrating Photoelectric Detection.The utility model can not only meet the two-way photoelectric sensing testing requirements of rays safety detection apparatus, but also have the function of automatic gain control function, anti-mutual interference and self-test function.
Description
Technical field
It is double to photoelectric sensor is penetrated that the utility model relates to a kind of combined types, also relates to include the combined type pair to penetrating
The rays safety detection apparatus of photoelectric sensor, belongs to the field of radiation detection technology.
Background technique
In order to perceive the row packet passed through on rays safety detection apparatus conveyer belt, and then counting and X-ray check are carried out to row packet, needed
The inlet rays safety detection apparatus Hang Bao is installed by correlation photoelectric sensor.It is provided according to Civil Aviation System, correlation photoelectric sensor is necessary
It can detecte the flat steel sheets on conveyer belt with a thickness of 7mm.For this purpose, the optical axis of correlation photoelectric sensor has to be lower than safety check
7mm above equipment conveyer belt.But correlation photoelectric sensor uses such optical axis height, for being stretched out from Channel front end
Object cannot timely respond to, the X-ray detection image that may cause object is imperfect.So, as shown in Figure 1, needing
A correlation photoelectric sensor is set again above the correlation photoelectric sensor, for avoiding the above problem.
Therefore, the sense channel entrance of a rays safety detection apparatus at least needs to install two correlation photoelectric sensors.For
The interchangeable rays safety detection apparatus of sense channel entrance and exit, entrance are required at least two correlation photoelectric sensings of installation
Device, i.e. minimum of four correlation photoelectric sensor work at rays safety detection apparatus channel both ends simultaneously.Currently, domestic rays safety detection apparatus is made
Correlation photoelectric sensor is the outsourcing finished product of single correlation photoelectric sensor, the disadvantage is that:
1. this list correlation photoelectric sensor is produced by special producer, and is encapsulated using integrated form, cooperate integrated put down
Surface launching pipe and reception pipe, included optical focus device, higher cost；
2. two physically separate photoelectric sensors, mounting and adjusting are time-consuming and laborious；
3. not having automatic gain adjustment function, transmission power adjustment knob and detection sensitivity adjustment rotation are provided in outside
Button, when installation, must manually carry out sensitivity debugging；
4. itself functional check cannot be carried out according to the requirement of rays safety detection apparatus, it is abnormal with timely discovery sensor.
In addition, this list correlation photoelectric sensor includes transmitting terminal and receiving end, the light beam of transmitting is certain mode
Modulation light.Also, the modulation optical mode of same model is fixed, and cannot be changed.
Summary of the invention
It is double to penetrating photoelectric sensor that primary technical problem to be solved in the utility model is to provide a kind of combined type.
It includes that above-mentioned combined type is double to penetrating photoelectricity that another technical problem to be solved in the utility model, which is to provide a kind of,
The rays safety detection apparatus of sensor.
In order to realize above-mentioned purpose of utility model, the utility model is adopted the following technical solutions:
According to the utility model embodiment in a first aspect, to provide a kind of combined type double to penetrating photoelectric sensor, including the end A
Module and B end module, the A end module and the B end module respectively include transmit circuit and receive circuit；
The transmit circuit of the A end module forms one for issuing modulation light to the reception circuit for being incident upon the B end module
Road is to penetrating Photoelectric Detection；
The transmit circuit of the B end module is formed another for issuing modulation light to the reception circuit for being incident upon the A end module
All the way to penetrating Photoelectric Detection；
The reception circuit opposite direction of the A end module and B end module arrangement, makes two-way to the modulation light for penetrating Photoelectric Detection
It is contrary.
Wherein more preferably, respectively the internal transmit circuit and the reception are electric for the A end module and the B end module
The coded modulation on road is different with decoding modulation；Wherein, the transmit circuit coded modulation of the A end module and the B end module
It is consistent to receive circuit decoding modulation, the transmit circuit coded modulation of the B end module and the reception circuit of the A end module decode
Modulation is consistent.
Wherein more preferably, the transmit circuit of the A end module and the B end module respectively includes coded modulation unit, preceding
Grade driving unit, power drive unit, light transmitting unit and functional test unit, the coded modulation unit, the prime
Driving unit, the power drive unit and the light transmitting unit are sequentially connected, the functional test unit and it is described before
The input terminal connection of grade driving unit；Wherein,
The external function testing signal for adjusting the functional test unit output is high level or low level, makes the light
The corresponding modulation light issued or stop issuing corresponding frequencies of transmitting unit.
Wherein more preferably, it is single to respectively include opto-electronic receiver conversion for the reception circuit of the A end module and the B end module
Member, amplifying unit, decoding modulation unit, detection output unit, automatic gain control unit and error detection units；The photoelectricity
It receives converting unit to connect with the input terminal of the amplifying unit, the output end of the amplifying unit and the decoding modulation unit
Input terminal connection, it is described decoding modulation unit output end respectively with the detection output unit, the automatic growth control
The connection of the input terminal of unit and the error detection units, the output end and the amplifying unit of the automatic gain control unit
Input terminal connection.
Wherein more preferably, in the transmit circuit of the A end module and the B end module and reception circuit, coded modulation list
Frequency modulation or pm mode is respectively adopted in member and decoding modulation unit, keeps the corresponding modulating frequency of two beam modulation lights or phase different.
Wherein more preferably, the external first capacitor of the coded modulation unit and first resistor, adjust the first capacitor and
The numerical value of the first resistor makes the coded modulation unit based on different coding rate-adaptive pacemaker modulation signals.
Wherein more preferably, external 6th capacitor of the decoding modulation unit and the 9th resistance, adjust the 6th capacitor and
The numerical value of 9th resistance is based on the decoding modulation unit and the corresponding consistent decoding frequency of coded modulation unit
The decoded output of rate completion modulated optical signal.
Wherein more preferably, the automatic gain control unit includes proportional integration amplifying circuit, bleeder circuit, the partial pressure
The input terminal of circuit be used for receive it is described decoding modulation unit output amplifier gain detection signal, the bleeder circuit it is defeated
Outlet is connect with the proportional integration input amplifier, and the output end of the proportional integration amplifying circuit to described for putting
Big unit inputs automatic growth control output signal, to automatically control the variable resistance amplifier gain of the amplifying unit.
Wherein more preferably, the optical axis of the modulation light is parallel and has default spacing, to adapt to the sensing of luggage parcel.
According to the second aspect of the utility model embodiment, a kind of rays safety detection apparatus is provided, it is double right including above-mentioned combined type
Penetrate photoelectric sensor, the combined type is double to the entrance penetrated photoelectric sensor and be mounted on the rays safety detection apparatus.
Compared with prior art, combined type provided by the utility model pair has following spy to photoelectric sensor is penetrated
Point:
(1) meet the whole of rays safety detection apparatus Photoelectric Detection to require.In rays safety detection apparatus inlet, it is double that a set of combined type is installed
To photoelectric sensor is penetrated, the detection of two-way photoelectric sensing can be met.Installation and operation and maintenance are facilitated, system is effectively increased
Reliability；
(2) this combined type is double to design of photo electricity sensor is penetrated in a printed circuit-board assembly, and volume substantially reduces, and subtracts
Change system wiring, improves electromagnetic compatible environment.
(3) universal elements are used, are designed specifically for rays safety detection apparatus, outer enclosure is not necessarily to, cost is greatly reduced, and wide
The photoelectric sensor of general application is compared, cost be only its 1/10th.
(4) there is automatic gain control function, after system installation, without manually adjusting detection sensitivity.
(5) have the function of anti-mutual interference, avoid the mutual interference of two photoelectric sensors of X-ray rays safety detection apparatus or more, it is ensured that
Row packet detects accurate and reliable.
(6) with self-test function, it can be achieved that multiple combined types pair are tested the unified of photoelectric sensor is penetrated, with timely
It was found that device is abnormal.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that existing rays safety detection apparatus entrance installs two correlation photoelectric sensors；
Fig. 2 is that combined type provided by the utility model is double to the working principle block diagram for penetrating photoelectric sensor；
Fig. 3 is that combined type provided by the utility model is double to penetrating in photoelectric sensor, the hair of A end module and B end module
Transmit-receive radio road and the functional block diagram for receiving circuit；
Fig. 4 is that combined type provided by the utility model is double to penetrating in photoelectric sensor, the coded modulation list of transmit circuit
The circuit diagram of member；
Fig. 5 is that combined type provided by the utility model is double to penetrating in photoelectric sensor, and the prime of transmit circuit drives single
Member, power drive unit, light transmitting unit circuit diagram；
Fig. 6 is that combined type provided by the utility model is double to penetrating in photoelectric sensor, and the opto-electronic receiver for receiving circuit turns
Change the circuit diagram of unit and amplifying unit；
Fig. 7 is that combined type provided by the utility model is double to penetrating in photoelectric sensor, and the decoding modulation for receiving circuit is single
The circuit diagram of member；
Fig. 8 is that combined type provided by the utility model is double to penetrating in photoelectric sensor, and the detection output for receiving circuit is single
The circuit diagram of member；
Fig. 9 is that combined type provided by the utility model is double to penetrating in photoelectric sensor, receives the automatic gain control of circuit
The circuit diagram of unit processed；
Figure 10 is that combined type provided by the utility model is double to penetrating in photoelectric sensor, receives the error detection list of circuit
The circuit diagram of member.
Specific embodiment
The technology contents of the utility model are described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Fig. 2, it includes at least two setting respectively to photoelectric sensor is penetrated that combined type provided by the utility model is double
It is equipped with transmit circuit and receives the module of circuit.For the sake of for convenience of description, it is referred to as A end module respectively in the present invention
With B end module.A end module 1 and B end module 2 include transmit circuit 3 and reception circuit 4；Wherein, the transmitting electricity of A end module 1
Road 3 is formed all the way to penetrating Photoelectric Detection for issuing modulation light 18 to the reception circuit 4 for being incident upon B end module 2；B end module 2
Transmit circuit 3 forms another way to penetrating Photoelectric Detection for issuing modulation light 19 to the reception circuit 4 for being incident upon A end module 1.And
And the opposite arrangement of the reception circuit 4 of A end module 1 and B end module 2, keep two-way contrary to the modulation light for penetrating Photoelectric Detection,
It is interfered with each other to geographically avoid two-way to Photoelectric Detection is penetrated.
In addition, the decoding modulation of the reception circuit of the transmit circuit coded modulation of A end module and B end module is consistent, B end module
Transmit circuit coded modulation and A end module the decoding modulation of reception circuit it is consistent.Also, A end module 1 and B end module 2 itself
Internal transmit circuit is different with decoding modulation with the coded modulation for receiving circuit, to effectively eliminate mutual interference.
Modulation light 18 is parallel with 19 optical axis of modulation light and has default spacing, to adapt to the sense of different shape luggage parcel
It surveys；Wherein preferably, modulation light 18 it is parallel with 19 optical axis of modulation light and have 70 millimeters of spacing.
The transmit circuit 3 of A end module 1 and B end module 2 and reception circuit 4 are assembled in same printed circuit board, are made
This combined type is double substantially to reduce the volume for penetrating photoelectric sensor, to simplify system wiring, improves electromagnetic compatible environment.
As shown in figure 3, the transmit circuit 3 of A end module 1 and B end module 2 respectively includes coded modulation unit 5, prime driving
Unit 6, power drive unit 7, light transmitting unit 8 and functional test unit 17, wherein coded modulation unit 5, prime driving
Unit 6, power drive unit 7 and light transmitting unit 8 are sequentially connected, and functional test unit 17 is defeated with fore-stage driver unit 6
Enter end connection.Functional test unit 17 is used to send external function testing signal to transmit circuit 3, to control at transmit circuit 3
In modulation light emission state or modulation light closed state.Specifically, being believed by the coded modulation for generating coded modulation unit
It number is sent to fore-stage driver unit 6, and prime driving is controlled by the external function testing signal that functional test unit 17 generates
The prime driving signal that unit 6 exports makes power drive unit 7 that light transmitting unit 8 be driven to issue or stop issuing respective tones
The modulation light of rate, so that the transmit circuit 3 of A end module 1 and B end module 2 be made to be in modulation light emission state or modulation light closing
State.
Equally, as shown in figure 3, the reception circuit 4 of A end module 1 and B end module 2 respectively includes opto-electronic receiver converting unit
9, amplifying unit 10, decoding modulation unit 11, detection output unit 12, automatic gain control unit 13 and error detection units
14；Wherein, opto-electronic receiver converting unit 9 is connect with the input terminal of amplifying unit 10, and the output end of amplifying unit 10 and decoding are adjusted
The input terminal of unit 11 processed connects, decode the output end of modulation unit 11 respectively with detection output unit 12, automatic growth control
The connection of the input terminal of unit 13 and error detection units 14, the output end of automatic gain control unit 13 are defeated with amplifying unit 10
Enter end connection；The output end of output unit 12 is detected for exporting detection output signal 15, the output end of error detection units 14
For output error output signal 16.
Wherein, opto-electronic receiver converting unit 9 is used to for received modulation light 18 or modulation light 19 being converted into modulation electric current, and
It exports and is converted into modulated voltage signal to amplifying unit 10；The modulated voltage signal export to decoding modulation unit 11, so as to
The input decoding detection output signal of output unit 12 is detected, to complete the decoded output of modulated optical signal；Detect output unit
12, for decoding detection output signal based on the received, indicate whether to receive corresponding modulation light.Automatic gain control unit 13
(that reflects modulation light 18 or modulation lights for amplifier gain detection signal for decoding the output of modulation unit 11 based on the received
19 power), automatic growth control output signal is inputted to amplifying unit 10, to control the gain of amplifying unit 10, thus will
The modulated voltage signal that amplifying unit 10 exports is stablized in the voltage range that decoding modulation unit 11 can be correctly decoded, to exempt from
In addition to being manually adjusted to 10 gain of amplifying unit.Error detection units 14 are used to be distinguished according to the wrong output signal 16 of output
Whether row packet is normal through double to penetrating whether photoelectric sensor breaks down with this combined type.
In order to avoid this combined type it is double to the two beam modulation lights (modulation light 18 and modulation light 19) penetrated in photoelectric sensor it
Between interfere with each other, coded modulation unit 5 and decoding modulation unit 11 modulation condition answer strict differences.Therefore, practical new at this
In one embodiment of type, coded modulation unit 5 and decoding modulation unit 11 can be all made of frequency modulation or pm mode, make two-way
It is modulated to Photoelectric Detection is penetrated using different frequency or phase, i.e., this combined type is double to the two beam tune penetrated in photoelectric sensor
The modulating frequency or phase of light (i.e. modulation light 18 and modulation light 19) processed are different.
Specifically, being adopted when this combined type is double to the coded modulation unit 5 for penetrating photoelectric sensor and decoding modulation unit 11
When with mode of frequency regulation, the optical pulse frequency emitted of transmit circuit 3 of A end module 1 and the reception circuit 4 of duty ratio and B end module 2
Solution code frequency and duty ratio it is consistent, the optical pulse frequency and duty ratio and A end module 1 that the transmit circuit 3 of B end module 2 emits
Reception circuit 4 solution code frequency and duty ratio it is consistent.When this combined type is double to 5 He of coded modulation unit for penetrating photoelectric sensor
When decoding modulation unit 11 using pm mode, light pulse phase and duty ratio and the end B that the transmit circuit 3 of A end module 1 emits
The solution code phase and duty ratio of the reception circuit 4 of module 2 are consistent, light pulse phase that the transmit circuit 3 of B end module 2 emits and
Duty ratio is consistent with the solution code phase of the reception circuit 4 of A end module 1 and duty ratio.Also, the transmit circuit 3 of A end module 1 is sent out
The optical pulse frequency and duty ratio penetrated are different from the optical pulse frequency and duty ratio that the transmit circuit 3 of B end module 2 emits；Alternatively,
The light pulse phase that the transmit circuit 3 of light pulse phase and duty ratio B end module 2 that the transmit circuit 3 of A end module 1 emits emits
Position and duty ratio are different.
Below with reference to Fig. 4~Figure 10, it is double to the working principle for penetrating photoelectric sensor that this combined type is described in detail.
In the transmit circuit 3 of A end module 1 and B end module 2, coded modulation unit 5 can use coded integrated circuits,
For based on different coding frequencies or encoding phase exports coding modulated signal.Also, the volume of A end module 1 and B end module 2
The coding frequency or encoding phase of code modulation unit 5 are different.
In one embodiment of the utility model, as shown in figure 4, the coded integrated circuits U1 of coded modulation unit 5 can
Using the coding integration chip (general tone decoder) of model LM567.Wherein, the 5th of coding integration chip U1 is drawn
Foot (timing resistor end TR) is connect with one end of first resistor R1, and the of the other end of first resistor R1 and coding integration chip U1
6 pins (timing capacitor end TC) are connect with one end of first capacitor C1 respectively, the other end ground connection of first capacitor C1, coding integration
The 4th pin of chip U1 is connect with supply voltage VCC, the 7th pin ground connection of coding integration chip U1.Also, coding integration chip
The 5th pin (timing resistor end TR) of U1 is also used to exports coding modulated signal 20 (to vibrate square wave).Coding integration chip U1
The 2nd pin (loop filter end) connect with one end of the second capacitor C2, the other end of the second capacitor C2 ground connection.
Coding integration chip U1 can make coding integration chip by external timing element first capacitor C1 and first resistor R1
The frequency of oscillation of U1 consecutive variations within the scope of 0.01Hz~500kHz.For example, in the coded modulation unit 5 of A end module 1,
When first capacitor C1 and first resistor R1 difference value is 8.2k Ω and 0.01 μ F, the coding frequency of coding integration chip U1 is about
Coding frequency for 11kHz, i.e. coded modulation unit 5 is about 11kHz；In the coded modulation unit 5 of B end module 2, when first
When capacitor C1 and first resistor R1 difference value is 10k Ω and 0.01 μ F, the coding frequency of coding integration chip U1 is about 9kHz,
That is the coding frequency of coded modulation unit 5 is about 9kHz.In addition, the second capacitor C2 determines as the filter capacitor for adjusting bandwidth
Determine the pullin banwidth of coding integration chip U1, the capacitance of the second capacitor C2 is bigger, and the bandwidth of coding integration chip U1 is narrower, compiles
The BREATHABLE BANDWIDTH 0%~14% of code integrated chip U1.
In the transmit circuit 3 of A end module 1 and B end module 2, as shown in figure 5, fore-stage driver unit 6 can be using triggering
Device D1A；Such as the NAND gate Schmidt trigger of model CD4093, NAND gate Schmidt trigger D1A tool can be used
There are two input terminal and an output ends.Wherein, the first input end of NOT gate Schmidt trigger D1A and functional test unit 17
Connection, for receiving external function testing signal；The second input terminal of NOT gate Schmidt trigger D1A and the volume of transmit circuit 3
The modulation signals output end connection of code modulation unit 5, i.e. the second input terminal can be with the 5th pin of coding integration chip U1
Connection, for receiving the modulation signals 20 of the output of coded modulation unit 5.The output end of NOT gate Schmidt trigger D1A with
The input terminal of power drive unit 7 connects.The modulation signals 20 and external function testing exported by coded modulation unit 5
Signal generates prime driving signal 21 after NAND gate Schmidt trigger D1A NAND operation, and from NOT gate Schmidt trigger
The output end of D1A is exported to the input terminal of power drive unit 7.
In the transmit circuit 3 of A end module 1 and B end module 2, as shown in figure 5, power drive unit 7 includes first crystal
Triode V3, the second transistor V4, second resistance R2,3rd resistor R3 and the 4th resistance R4；First crystal triode V3
Input terminal of the base stage as power drive unit 7, for receiving the prime driving signal 21 of the output of fore-stage driver unit 6；The
The emitter of the grounded collector of one transistor V3, first crystal triode V3 is connect with one end of 3rd resistor R3, the
The other end of three resistance R3 is connect with the base stage of second resistance R2 and the second transistor V4 respectively, and second resistance R2's is another
End is connect with one end of supply voltage VCC and the 4th resistance R4 respectively, the other end and the second transistor of the 4th resistance R4
The emitter of V4 connects, and the collector of the second transistor V4 is connect with the input terminal of light transmitting unit 8.
Light transmitting unit 8 can use infrared light-emitting diode V1, for emitting modulation light 18 or modulation light 19.It is infrared
Input terminal of the anode of light emitting diode V1 as light transmitting unit 8, for connecting with the collector of the second transistor V4
It connects, the minus earth of infrared light-emitting diode V1.Wherein preferably, the peak emission wavelength of infrared light-emitting diode V1 is
940nm, spectral bandwidth 45nm.
Wherein, second resistance R2 and 3rd resistor R3 forms voltage dividing bias circuit, provides directly for the second transistor V4
Galvanic electricity pressure；4th resistance R4 is current-limiting resistance, realizes the effect of current limliting.
When the received external function testing signal of fore-stage driver unit 6 is high level, before fore-stage driver unit 6 exports
Grade driving signal 21 is modulation signals 20, which acts on the first crystal three of power drive unit 7
Pole pipe V3 and the second transistor V4, so that the infrared light-emitting diode V1 of light transmitting unit 8 be driven to issue corresponding frequencies
Modulation light.When the received external function testing signal of fore-stage driver unit 6 is low level, what fore-stage driver unit 6 exported
Prime driving signal 21 is high level, ends first crystal triode V3 and the second transistor V4, light transmitting unit 8
Infrared light-emitting diode V1 stop issue corresponding frequencies modulation light.
In the reception circuit 4 of A end module 1 and B end module 2, as shown in fig. 6, opto-electronic receiver converting unit 9 can use
PIN silicon photoelectric diode V2, for receiving modulation light 18 or modulation light 19, and by the received modulation light 18 of institute or 19 turns of modulation light
Change modulation electric current into.Wherein preferably, the detection spectral region of PIN silicon photoelectric diode V2 is 840nm~1100nm, response is bent
Line peak value corresponds to 940nm, makes the infrared light-emitting diode of the detection spectrum and light transmitting unit 8 of PIN silicon photoelectric diode V2
The spectral region of V1 matches, to obtain good transmission response.
As shown in fig. 6, amplifying unit 10 includes by the first operational amplifier N1A (as using model TL074 operation amplifier
Device), the first field-effect tube V5, the 6th resistance R6 and the 5th resistance R5 composition variable resistance amplifier, and input biasing circuit 26.Its
In, the non-inverting input terminal of the first operational amplifier N1A is connect with one end of the 5th resistance R5, another termination of the 5th resistance R5
Ground, the inverting input terminal of the first operational amplifier N1A respectively with the output end of opto-electronic receiver converting unit 9 (two pole of PIN silicon photoelectricity
The cathode of pipe V2), one end of the 6th resistance R6, the first field-effect tube V5 drain electrode connection, the output of the first operational amplifier N1A
End is connect with the input terminal of the other end of the 6th resistance R6, the source electrode of the first field-effect tube V5, decoding modulation unit 11 respectively, the
The grid of one field-effect tube V5 is connect with input biasing circuit 26.Wherein, input biasing circuit 26 includes the 7th resistance R7 and the
Eight resistance R8, one end of the 7th resistance R7 are connect with the output end of automatic gain control unit 13, the other end of the 7th resistance R7
It is connect respectively with the grid of one end of the 8th resistance R8 and the first field-effect tube V5, the other end ground connection of the 8th resistance R8.
The modulation electric current that the variable resistance amplifier of amplifying unit 10 is used to export received opto-electronic receiver converting unit 9 is converted
At modulated voltage signal 22, and it is input to the input terminal of decoding modulation unit 11.In order to guarantee that modulated voltage signal 22 is stablized
In the voltage range that decoding modulation unit 11 can be correctly decoded, need to control the gain of variable resistance amplifier.Due to variable resistance amplifier
Maximum gain be the 6th resistance R6 value, the least gain of variable resistance amplifier is the conducting resistance of the first field-effect tube V5；
Therefore, the automatic growth control output signal 25 that variable resistance amplifier is exported by receiving automatic gain control unit 13, with control
The on state of first field-effect tube V5 realizes variable resistance amplifier automatic gain control, to eliminate variable resistance amplifier gain
Manually adjust.
In the reception circuit 4 of A end module 1 and B end module 2, decoding modulation unit 11 can use decoding integrated circuit,
For defeated based on the decoding for completing modulated optical signal with the consistent solution code frequency of corresponding coded modulation unit 5 or solution code phase
Out.
In one embodiment of the utility model, as shown in fig. 7, the decoding integrated circuit U2 of decoding modulation unit 11
The decoding integrated chip (general tone decoder) of model LM567 can be used.Because the decoding integrated chip both can be real
Existing encoding function, also may be implemented decoding function.Decode the 3rd pin (input terminal) and the one of third capacitor C4 of integrated chip U2
End connection, the other end of third capacitor C4 are used to receive the modulated voltage signal 22 of the variable resistance amplifier output of amplifying unit 10；
The 2nd pin (loop filter end) of decoding integrated chip U2 is connect with one end of the 4th capacitor C5, the other end of the 4th capacitor C5
Ground connection；The 1st pin (output filtering end) for decoding integrated chip U2 is connect with one end of the 5th capacitor C6, and the 5th capacitor C6's is another
1st pin of one end ground connection, decoding integrated chip U2 is also used to the input terminal input amplifier to automatic gain control unit 13
Gain detects signal 24, to reflect the power of the modulated voltage signal 22 of the output of amplifying unit 10；Decode the 5th of integrated chip U2
Pin (timing resistor end TR) is connect with one end of the 9th resistance R9, the other end of the 9th resistance R9 respectively with decoding integrated chip
The 6th pin (timing capacitor end TC) of U2 is connected with one end of the 6th capacitor C7, the other end ground connection of the 6th capacitor C7, decoding set
It is connect at the 4th pin of chip U2 with supply voltage VCC, the 7th pin ground connection of decoding integrated chip U2.Decode integrated chip U2's
8th pin (output end) is respectively used to defeated to the input terminal input decoding detection of detection output unit 12, error detection units 14
Signal 23 out.
Decoding integrated circuit U2 can make the integrated electricity of encoding and decoding by external timing element the 9th resistance R9 and the 6th capacitor C7
The frequency of oscillation of road U2 consecutive variations within the scope of 0.01Hz~500kHz.For example, single in order to modulate the decoding of B end module 2
The solution code frequency of member 11 is corresponding with the coding frequency of coded modulation unit 5 of A end module 1, needs the decoding tune of B end module 2
The 9th resistance R9 and the 6th capacitor C7 value in unit 11 processed are respectively 8.2k Ω and 0.01 μ F, to make the solution of B end module 2
The solution code frequency of code modulation unit 11 is about 11kHz.In order to make the solution code frequency for decoding modulation unit 11 and the end B of A end module 1
The coding frequency of the coded modulation unit 5 of module 2 is corresponding, needs the 9th resistance in the decoding modulation unit 11 by A end module 1
R9 and the 6th capacitor C7 value are respectively 10k Ω and 0.01 μ F, to make the decoding frequency of the decoding modulation unit 11 of A end module 1
Rate is about 9kHz.In addition, the 4th capacitor C5 determines the pull-in range of decoding integrated chip U2 as the filter capacitor for adjusting bandwidth
The capacitance of width, the 4th capacitor C5 is bigger, and the bandwidth for decoding integrated chip U2 is narrower, decodes the BREATHABLE BANDWIDTH of integrated chip U2
0%~14%.
Therefore, in one embodiment of the utility model, correspond to modulation light 18, the coding of 1 transmit circuit 3 of A end module
It is 11kHz that frequency and B end module 2, which receive the solution code frequency of circuit 4,；Corresponding to modulation light 19,2 transmit circuit 3 of B end module
The solution code frequency for encoding frequency and the reception circuit 4 of A end module 1 is 9kHz, to keep away while realizing two-way Photoelectric Detection
The mutual interference of two beam modulation lights is exempted from.
When the modulation that decoding integrated circuit U2 is exported by the variable resistance amplifier that third capacitor C4 receives amplifying unit 10
When voltage signal 22, if the 9th resistance R9 and the 6th capacitor in the frequency of modulated voltage signal 22 and decoding modulation unit 11
When the frequency of C7 setting is consistent, the 8th pin output decoding detection output signal 23 of decoding modulation unit 11 is low level, otherwise
For high level, to realize the decoded output of modulated optical signal (modulated voltage signal 22).
As shown in figure 8, detection output unit 12 includes first comparator D2A (such as comparator of model LM393), first
Light emitting diode H1 and the tenth resistance R10；One end of tenth resistance R10 is connect with supply voltage VCC, and the tenth resistance R10's is another
One end is connect with the anode of the first light emitting diode H1, and the cathode of the first light emitting diode H1 is respectively with decoding integrated circuit U2's
The inverting input terminal connection of 8th pin, first comparator D2A, the non-inverting input terminal and reference voltage Vref of first comparator D2A
Connection, the output end of first comparator D2A is for exporting detection output signal 15.
When the decoding detection output signal 23 that the received decoding modulation unit 11 of detection output unit 12 exports is low level
When, the first light emitting diode H1 is lit, and is used to indicate and is received circuit 4 (the reception circuit 4 of A end module 1 and B end module 2) receipts
The modulation light that corresponding transmit circuit 3 issues is arrived.At this point, reference voltage Vref is higher than the voltage of decoding detection output signal 23,
The detection output signal 15 of first comparator D2A output is high level.Conversely, when the detection received decoding of output unit 12 modulation
When the decoding detection output signal 23 that unit 11 exports is high level, the detection output signal 15 of first comparator D2A output is
Low level, the first light emitting diode H1 extinguish, and are used to indicate and receive circuit 4 (the reception circuit 4 of A end module 1 and B end module 2)
Corresponding modulation light is not received；In practical applications, the first light emitting diode H1 extinguishes, corresponding to having on rays safety detection apparatus conveyer belt
Luggage parcel passes through, and has blocked corresponding modulation light.
As shown in figure 9, automatic gain control unit 13 includes proportional integration amplifying circuit 27, bleeder circuit 28, partial pressure electricity
The input terminal on road 28 is used to receive the amplifier gain detection signal 24 that decoding modulation unit 11 exports, amplifier gain detection
The size of signal 24 reflects the power of the modulated voltage signal 22 of the output of amplifying unit 10.The output end of bleeder circuit 28 with than
Example 27 input terminal of integrating amplification circuit connection, the input that the output end of proportional integration amplifying circuit 27 is used for amplifying unit 10 are inclined
Circuits 26 input automatic growth control output signal 25, to automatically control the variable resistance amplifier gain of amplifying unit 10.
Wherein, bleeder circuit 28 includes the 15th resistance R15 and the 16th resistance R16, and one end of the 15th resistance R15 is made
For the input terminal of bleeder circuit 28, signal 24 is detected for receiving the amplifier gain that decoding modulation unit 11 exports；15th
One end of the other end of resistance R15 and the 16th resistance R16 are connected together as the output end of bleeder circuit 28, for than
Example 27 input terminal of integrating amplification circuit connection, the other end ground connection of the 16th resistance R16.
Proportional integration amplifying circuit 27 include second operational amplifier N1B (as use model TL074 operational amplifier),
Third operational amplifier N1C (as used model TL074 operational amplifier), the 8th capacitor C9, the 17th resistance R17, the tenth
Eight resistance R18；The non-inverting input terminal of second operational amplifier N1B is connect with 28 output end of bleeder circuit, second operational amplifier
The inverting input terminal of N1B is connect with the output end of second operational amplifier N1B, the output end of second operational amplifier N1B and
One end of 17 resistance R17 connects, the other end of the 17th resistance R17 anti-phase input with third operational amplifier N1C respectively
One end connection at end, the 18th resistance R18, the other end of the 18th resistance R18 are connect with one end of the 8th capacitor C9, the 8th electricity
The other end for holding C9 is connect with the output end of third operational amplifier N1C, and the output end of third operational amplifier N1C is for putting
The input biasing circuit 26 of big unit 10 inputs automatic growth control output signal 25；Third operational amplifier N1C's is same mutually defeated
Enter end to connect by the 19th resistance R19 with reference voltage Vref.
The amplifier gain that received decoding modulation unit 11 exports is detected signal 24, warp by automatic gain control unit 13
It crosses after bleeder circuit 28 divides and is input to proportional integration amplifying circuit 27, proportional integration amplifying circuit 27 increases received amplifier
Benefit detection signal 24 obtains voltage difference after operation, exports automatic growth control output signal 25 compared with reference voltage Vref,
The variable resistance amplifier gain that amplifying unit 10 is automatically controlled by automatic growth control output signal 25, thus by amplifying unit 10
The modulated voltage signal of output is stablized in the voltage range that decoding modulation unit 11 can be correctly decoded, to eliminate to amplification
10 gain of unit manually adjusts.
Since the X-ray check process of rays safety detection apparatus is to be started by this combined type pair to photoelectric sensor output signals triggering is penetrated
, for the row packet for preventing from occurring not sensing in detection process, in the process of running, it should confirm that this combined type is double to penetrating light in time
Electric transducer is in good working order.For this purpose, it is double to penetrating photoelectric sensing to detect this combined type by error detection units 14
The working condition of device is with the presence or absence of abnormal.
As shown in Figure 10, error detection units 14 include inverter cricuit 29, peak sample holding circuit 30, the second comparator
D2B (comparator as used model LM393), the second light emitting diode H2, eleventh resistor R11 and the 14th resistance R14；
The input terminal of inverter cricuit 29 is used to receive the decoding detection output signal 23 that decoding modulation unit 11 exports, inverter cricuit 29
Output end is connect with the input terminal of one end of eleventh resistor R11, peak sample holding circuit 30 respectively, eleventh resistor R11
The other end connect with supply voltage VCC, the homophase input of the output end of peak sample holding circuit 30 and the second comparator D2B
End connection, the inverting input terminal and reference voltage Vref of the second comparator D2B, the output end of the second comparator D2B and the second hair
The cathode of optical diode H2 connects, and the anode of the second light emitting diode H2 is connect with one end of the 14th resistance R14, the 14th electricity
The other end of resistance R14 is connect with supply voltage VCC, and the output end of the second comparator D2B is also used to output error output signal 16.
Wherein, inverter cricuit 29 includes the second field-effect tube V5, the second field-effect tube V5 drain electrode between source electrode it is internal simultaneously
It is associated with protection diode, protection diode cathode connects to drain in V5, and anode connects in V5 source electrode.The grid of second field-effect tube V5 is made
For the input terminal of inverter cricuit 29, output signal 23 is detected for receiving the decoding that decoding modulation unit 11 exports；Second effect
Should pipe V5 drain electrode be inverter cricuit 29 output end, for will received decoding detection 23 reverse phase of output signal after be input to peak
It is worth sample-and-hold circuit 30；The source electrode of second field-effect tube V5 is grounded.
Peak sample holding circuit 30 includes first diode V6, twelfth resistor R12, thirteenth resistor R13, capacitor
C8；Input terminal of the anode of first diode V6 as peak sample holding circuit 30, for receiving the output of inverter cricuit 29
Decoding after inverted detects output signal 23, and the cathode of first diode V6 is connect with one end of twelfth resistor R12, and the tenth
The other end of two resistance R12 respectively with one end of thirteenth resistor R13, the anode of capacitor C8, the second comparator D2B it is same mutually defeated
Enter end connection, the other end of thirteenth resistor R13 and the cathode of capacitor C8 are grounded respectively.
The sample time constant, τ 1 of peak sample holding circuit 30 is the product of twelfth resistor R12 and capacitor C8, is kept
Timeconstantτ 2 is the product of thirteenth resistor R13 and capacitor C8.Wherein preferably, to realize rapid peak sampling, peak value is taken
The sample time constant, τ 1 of sample holding circuit 30 can be 0.0022s with value；And in order to distinguish row packet whether normal through with
This combined type is double to penetrating whether photoelectric sensor breaks down, and peak sample 30 retention time of holding circuit constant, τ 2 is much larger than and takes
Sample timeconstantτ 1, value are that 600s is best.
When decoding 11 successfully decoded of modulation unit, the decoding detection output signal 23 of output is low level, capacitor C8
It is charged to high level within 1 time of sample time constant, τ, and the voltage of capacitor C8 is made to be higher than reference voltage Vref, at this point, the
The wrong output signal 16 of two comparator D2B output is high level, extinguishes the second light emitting diode H2, is used to indicate compound
Formula is double to be in normal operating conditions to penetrating photoelectric sensor.
Due to this combined type it is double to penetrating photoelectric sensor and be in normal operating conditions when, multiple row packets pass through rays safety detection apparatus
Conveyer belt blocks this combined type pair and does not exceed 60s generally to the time for the modulation light optical axis for penetrating photoelectric sensor, and keeps
Timeconstantτ 2 is much larger than this time, and the voltage within this time on capacitor C8 is not yet discharged to reference voltage Vref, this
When, once decoding modulation unit 11 receives modulated voltage signal and successfully decoded, capacitor C8 is charged to rapidly high level.
Therefore, when the detection of row packet, the second light emitting diode H2 not can be lit, and mistake output signal 16 will not be low level.But when out
When existing following situations, mistake output signal 16 can become low level, need to export alarm signal:
When just having powered on 1. combined type is double to penetrating photoelectric sensor, and having received circuit 4 and do not receive corresponding modulation light, by
In C8 voltage be zero, at this point, wrong output signal 16 will export low level.
2. combined type is double to penetrating in the photoelectric sensor course of work, receives circuit 4 and do not receive modulation light in for a long time
Or when receiving device appearance exception, the voltage of capacitor C8 will be with 2 exponential damping of timeconstantτ, and the voltage of final capacitor C8 is low
In reference voltage Vref, mistake output signal 16 is made to export low level.
Wherein, it is double to the function of penetrating photoelectric sensor to be used to test this combined type when powering on for the first situation；Second
Situation is double to the real-time monitoring penetrated when photoelectric sensor is run for this combined type, to have found that it is likely that existing failure in time, from
And it realizes to the double fault detections to photoelectric sensor is penetrated of this combined type.
In conclusion combined type provided by the utility model is double to penetrating photoelectric sensor compared with prior art,
Beneficial effect is:
(1) meet the whole of rays safety detection apparatus Photoelectric Detection to require.In rays safety detection apparatus inlet, it is double that a set of combined type is installed
To photoelectric sensor is penetrated, the detection of two-way photoelectric sensing can be met.Installation and operation and maintenance are facilitated, system is effectively increased
Reliability；
(2) this combined type is double to design of photo electricity sensor is penetrated in a printed circuit-board assembly, and volume substantially reduces, and subtracts
Change system wiring, improves electromagnetic compatible environment.
(3) universal elements are used, are designed specifically for rays safety detection apparatus, outer enclosure is not necessarily to, cost is greatly reduced, and wide
The photoelectric sensor of general application is compared, cost be only its 1/10th.
(4) there is automatic gain control function, after system installation, without manually adjusting detection sensitivity.
(5) have the function of anti-mutual interference, avoid the mutual interference of two photoelectric sensors of X-ray rays safety detection apparatus or more, it is ensured that
Row packet detects accurate and reliable.
(6) with self-test function, it can be achieved that multiple combined types pair are tested the unified of photoelectric sensor is penetrated, with timely
It was found that device is abnormal.
In addition, the utility model also provides a kind of rays safety detection apparatus.The entrance of the rays safety detection apparatus is equipped with the utility model institute
The combined type of offer is double to photoelectric sensor is penetrated, to realize that two-way photoelectric sensing detects, and perceives on rays safety detection apparatus conveyer belt
The row packet of process, and then counting and X-ray check are carried out to row packet.
It is double to combined type provided by the utility model to penetrating photoelectric sensor and corresponding rays safety detection apparatus carries out above
Detailed description.For those of ordinary skill in the art, to it under the premise of without departing substantially from the utility model in essence spirit
Any obvious change done will all belong to the protection scope of the utility model patent power.
Claims (10)
1. a kind of combined type is double to penetrating photoelectric sensor, it is characterised in that including A end module and B end module, the A end module and
The B end module respectively includes transmit circuit and receives circuit；
For the transmit circuit of the A end module for issuing modulation light to the reception circuit for being incident upon the B end module, it is right all the way to be formed
Penetrate Photoelectric Detection；
The transmit circuit of the B end module forms another way for issuing modulation light to the reception circuit for being incident upon the A end module
To penetrating Photoelectric Detection；
The reception circuit opposite direction of the A end module and B end module arrangement, makes two-way to the modulation light direction for penetrating Photoelectric Detection
On the contrary.
2. combined type as described in claim 1 is double to penetrating photoelectric sensor, it is characterised in that:
The A end module and the B end module respectively the internal transmit circuit and the coded modulation for receiving circuit and
Decoding modulation is different；Wherein, the reception circuit of the transmit circuit coded modulation of the A end module and the B end module, which decodes, adjusts
System is consistent, and the reception circuit decoding modulation of the transmit circuit coded modulation of the B end module and the A end module is consistent.
3. combined type as described in claim 1 is double to penetrating photoelectric sensor, it is characterised in that:
The transmit circuit of the A end module and the B end module respectively includes coded modulation unit, fore-stage driver unit, power
Driving unit, light transmitting unit and functional test unit, the coded modulation unit, the fore-stage driver unit, the function
Rate driving unit and the light transmitting unit are sequentially connected, the input of the functional test unit and the fore-stage driver unit
End connection；
Wherein, the external function testing signal for adjusting the functional test unit output is high level or low level, makes the light
The corresponding modulation light issued or stop issuing corresponding frequencies of line transmitting unit.
4. combined type as described in claim 1 is double to penetrating photoelectric sensor, it is characterised in that:
The reception circuit of the A end module and the B end module respectively includes opto-electronic receiver converting unit, amplifying unit, decoding
Modulation unit, detection output unit, automatic gain control unit and error detection units；The opto-electronic receiver converting unit and institute
The input terminal connection of amplifying unit is stated, the output end of the amplifying unit is connect with the input terminal of the decoding modulation unit, institute
The output end for stating decoding modulation unit is examined with the detection output unit, the automatic gain control unit and the mistake respectively
The input terminal connection of unit is surveyed, the output end of the automatic gain control unit is connect with the input terminal of the amplifying unit.
5. combined type as described in claim 3 or 4 is double to penetrating photoelectric sensor, it is characterised in that:
In the transmit circuit of the A end module and the B end module and reception circuit, coded modulation unit and decoding modulation unit
Frequency modulation or pm mode is respectively adopted, keeps the corresponding modulating frequency of two beam modulation lights or phase different.
6. combined type as claimed in claim 5 is double to penetrating photoelectric sensor, it is characterised in that:
The external first capacitor of the coded modulation unit and first resistor, adjust the number of the first capacitor and the first resistor
Value, makes the coded modulation unit based on different coding rate-adaptive pacemaker modulation signals.
7. combined type as claimed in claim 6 is double to penetrating photoelectric sensor, it is characterised in that:
External 6th capacitor of the decoding modulation unit and the 9th resistance, adjust the number of the 6th capacitor and the 9th resistance
Value makes the decoding modulation unit be based on completing modulated optical signal with the corresponding consistent solution code frequency of coded modulation unit
Decoded output.
8. combined type as claimed in claim 4 is double to penetrating photoelectric sensor, it is characterised in that:
The automatic gain control unit includes proportional integration amplifying circuit, bleeder circuit, and the input terminal of the bleeder circuit is used
Signal, the output end of the bleeder circuit and the ratio are detected in the amplifier gain for receiving the decoding modulation unit output
The connection of integrating amplification circuit input terminal, the output end of the proportional integration amplifying circuit are used for automatic to amplifying unit input
Gain controls output signal, to automatically control the variable resistance amplifier gain of the amplifying unit.
9. combined type as described in claim 1 is double to penetrating photoelectric sensor, it is characterised in that:
The optical axis of the modulation light is parallel and has default spacing, to adapt to the sensing of luggage parcel.
10. a kind of rays safety detection apparatus, it is characterised in that double to penetrating light including combined type described in any one of claim 1~9
Electric transducer, the combined type are double to the entrance penetrated photoelectric sensor and be mounted on the rays safety detection apparatus.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109557596A (en) * | 2018-08-17 | 2019-04-02 | 公安部第研究所 | A kind of combined type is double to penetrating photoelectric sensor and corresponding rays safety detection apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557596A (en) * | 2018-08-17 | 2019-04-02 | 公安部第研究所 | A kind of combined type is double to penetrating photoelectric sensor and corresponding rays safety detection apparatus |
| CN109557596B (en) * | 2018-08-17 | 2024-05-28 | 公安部第一研究所 | Combined type double-correlation photoelectric sensor and corresponding security inspection equipment |
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