CN103744123A - Multifunctional diffuse reflection photoelectric sensor - Google Patents

Abstract

The invention discloses a multifunctional diffuse reflection photoelectric sensor. The sensor comprises a shell which internally comprises an LED transmitting circuit, a receiving circuit, a transmitting control and receiving processor, a 32-bit ARM processor, a NPN/PNP dual-output chip and a key setting and display circuit, wherein the 32-bit ARM processor is connected with the transmitting control and receiving processor through an IIC communication bus, the 32-bit ARM processor is further connected with the NPN/PNP dual-output chip to control the output state of the NPN/PNP dual-output chip, the transmitting control and receiving processor is respectively connected with the LED transmitting circuit and the receiving circuit, and the 32-bit ARM processor is further connected with the key setting and display circuit. The sensor integrates the functions of dual output, time delay before output, time delay after output, monostable/bistable output switching and the like. A large number of models and specifications needing to be distinguished in existing production and design processes are all integrated in one product, thus greatly simplifying production and reducing the number of inventory models.

Description

Multi-functional diffuse reflection type photoelectric sensor

Technical field

The present invention relates to diffuse reflection type photoelectric sensor, more particularly, relate to a kind of multi-functional diffuse reflection type photoelectric sensor.

Background technology

Diffuse reflection type photoelectric sensor, that transmitter and receiver are placed in one, receiver can not receive the light signal that transmitter sends under normal circumstances, when detection thing enters sensing range, emission of light is mapped to its surface, forms diffuse effect, and part light is reflected back, receiver is received light signal, exports a switch controlling signal.The electric transducer that diffuses has distance adjustment function, at Industry Control scene or other application scenario, need to detect distance adjustment, determines sensing range, and its implementation is by regulating receiving end sensitivity, changes detection distance.

Existing diffuse reflection type photoelectric sensor, what mostly adopt is single output logic, NPN logic or PNP logic, often also disunity of the sensor using on our common factory's streamline, has plenty of NPN logic, has plenty of PNP logic; Object detected, just carry out immediately output, without time delay output function; Output state is monostable, namely only has a kind of steady state (SS), when object being detected, enters transient state, when detecting thing while removing, by transient recovery to steady state (SS); To detecting the setting of thing distance, be to regulate the intensity of power valve electric current to carry out distance setting by potentiometer, or regulate the sensitivity of reception amplifier circuit to carry out distance setting.Potentiometer regulates the impact that is subject to human factor, and consistance is difficult to be guaranteed, specific as follows:

1) diffuse reflection type photoelectric sensor output logic has two kinds of NPN and PNP, and the output logic of conventional diffuse reflection type photoelectric sensor often only has one, or NPN, or PNP; Output mode has two kinds of NO (often opening) and NC (normally closed), and some diffuse reflection type photoelectric sensor NO/NC is optional, and some NO/NC fixes.

2) conventional diffuse reflection type photoelectric sensor, detects object, just carries out immediately output and controls; Object leaves, and output recovers, and does not export time delay optional function.

3) conventional diffuse reflection type photoelectric sensor output state is monostable, and when target object enters, output triggers, and when object leaves, output disconnects again.

4) setting of conventional diffuse reflection type photoelectric sensor to object distance, mainly contains two kinds of implementations, and a kind of is to regulate the intensity of power valve electric current to carry out distance setting by potentiometer; Another kind is to regulate the sensitivity that receives amplifying circuit to carry out distance setting by potentiometer.

There is following defect in existing diffuse reflection type photoelectric sensor:

1) logic is single, if user's use occasion changes, lucky original sensor logic does not meet again existing requirement, just can only change a collection of sensor that meets logic requirement and replace original sensor, can bring no small loss to user simultaneously yet; Or when on production line, new old machine substitutes, sensor logic output may have conflict, what just there will be that a part used is NPN type, and what a part was used is positive-negative-positive, equally also can make troubles to user.

2) no-output delay function, there are a lot of application scenarios, sensor has other factors false triggering sensor in using, and at this moment sensor user need to arrange output time delay and eliminate these inevitable misoperations, and no-output delay function just cannot adapt to these application scenarios.

3) bistable state is that target object enters time output and triggers, when object leaves, export constant, when object enters again, output just disconnects, often carrying out an object output once changes, can be used as the flip flop sensor etc. that the bistable state counter used on production line or elevator detect use, these are that monostable sensor institute is irrealizable.

4), there is consistency problem in potentiometer adjustable range, and operating personnel different when scene arranges can, to the reserved different detection surplus of sensor distance, can affect detecting reliability if surplus is too small.The input part of sensor is easy to introduce electromagnetic interference (EMI), and while making the adding of potentiometer circuit design and shielding design, electromagnetic interference (EMI) intractability increases a lot, if process badly, the antijamming capability of product can be very weak.

As can be seen here, existing diffuse reflection type photoelectric sensor function singleness, very flexible, in different occasions, distinguish the sensor of selecting different model, user is when type selecting, when device upgrade is changed, all to distinguish the sensor of selecting different model, very inconvenient.And existing market needs is a multi-functional diffuse reflection type photoelectric sensor of design, simultaneously can compatible all output logics, and possess all conventional functions and pattern, by new distance setting means, improve original potentiometer apart from the defect of setting, can use and bring a lot of convenience to user, have good market outlook.

Summary of the invention

For the defect existing in prior art, the object of this invention is to provide a kind of multi-functional diffuse reflection type photoelectric sensor.

For achieving the above object, the present invention adopts following technical scheme:

A kind of multi-functional diffuse reflection type photoelectric sensor, comprise shell, in described shell, comprise LED radiating circuit, receiving circuit, emission control and receiving processor, 32 arm processors, NPN/PNP doubleway output chip and button setting and display circuits, described 32 arm processors are connected with emission control and receiving processor by IIC communication bus; Described 32 arm processors are also connected with NPN/PNP doubleway output chip, control the output state of NPN/PNP doubleway output chip; Described emission control and receiving processor are connected with LED radiating circuit and receiving circuit respectively; Described 32 arm processors are also connected with button setting and display circuit.

Before described 32 arm processors are realized output, time delay is or/and time delay after output.

Before described output, time delay divides 10 grades, is respectively 0s, 1s, 5s, 10s, 15s, 20s, 25s, 30s, 35s, 40s.

After described output, time delay divides 10 grades, is respectively 0s, 1s, 5s, 10s, 15s, 20s, 25s, 30s, 35s, 40s.

Described 32 arm processors send apart from signalization to emission control and receiving processor by IIC communication bus, by emission control and receiving processor according to object apart from selecting transmitter current grade.

Described is during from signalization, by emission control and receiving processor, according to object, apart from selecting, after transmitter current grade, by 32 arm processors, according to transmitter current rating calculation, to go out corresponding transmitter current reference point without back pitch apart from signalization.

Described apart from signalization when having powerful connections apart from signalization, by emission control and receiving processor, according to object, apart from selecting, after transmitter current grade, by 32 arm processors, according to transmitter current rating calculation, go out corresponding transmitter current reference point;

32 arm processors also calculate corresponding background reference point according to the value of background reception signal;

By transmitter current reference point and background reference point, calculate corresponding reference point.

Described button setting and display circuit are connected and send bistable output control or monostable pattern output control to described 32 arm processors.

Compared with prior art, adopt the multi-functional diffuse reflection type photoelectric sensor of one of the present invention, this sensor is simultaneously integrated: doubleway output function, can arrange separately NPN/PNP logic and the NO/NC state on each road; Delay function after time delay and output before output; Output monostable and bistable state handoff functionality etc., a large amount of models and specification that existing production and design link need to be distinguished have all comprised, be integrated in a product, simplified to a great extent production, reduced stock's model, and facilitated client's type selecting and use, and in later stage use procedure, also can change flexibly logic and state, the time delay simultaneously adding and bi-stable function make sensor can be applied in the occasion of some specific demands.In addition, by button, carry out the method that distance arranges, easy to operate, and also it is more reliable and more stable to make that result is set.

Accompanying drawing explanation

Fig. 1 is the principle schematic of a kind of multi-functional diffuse reflection type photoelectric sensor of the present invention;

Fig. 2 is 32 arm processors in Fig. 1 and the circuit diagram of NPN/PNP doubleway output chip;

Fig. 3 is 32 arm processors in Fig. 1 at the schematic flow sheet during from signalization without back pitch;

Fig. 4 is 32 arm processors in Fig. 1 schematic flow sheets when having powerful connections apart from signalization.

Embodiment

Below in conjunction with drawings and Examples, further illustrate technical scheme of the present invention.

Refer to the multi-functional diffuse reflection type photoelectric sensor of the one shown in Fig. 1, Fig. 2, comprise shell 11, in shell 11, be provided with circuit board 30, on circuit board 30, comprise that LED radiating circuit 12, receiving circuit 13, emission control and 14,32 arm processors 15 of receiving processor, NPN/PNP doubleway output chip 16 and button setting and 17,32 arm processors of display circuit 15 are connected with emission control and receiving processor 14 by IIC communication bus; 32 arm processors 15 are also connected with NPN/PNP doubleway output chip 16, control the output state of NPN/PNP doubleway output chip; Emission control and receiving processor 14 are connected with LED radiating circuit 12 and receiving circuit 13 respectively; 32 arm processors 15 are also connected with button setting and display circuit 17.

The front end of shell 11 is provided with filter 19, is provided with a diversing lens 21 and a receiver lens 22 in the Mirror frame structure 20 after optical filter, and the rear side of diversing lens 21 is provided with grating 24, and the rear side of receiver lens 22 is provided with optical filter 23;

In button setting and display circuit 17, comprise that charactron demonstration 26, power supply and signal knowledge lamp 27, button arrange 25;

In shell 11, be also provided with for the power circuit 18 to whole multi-functional diffuse reflection type photoelectric sensor power supply.

In Fig. 2, NPN/PNP doubleway output chip IC 1 is integrated IO-LINK output circuit chip, and it has independently output channel of two-way, and Qie Mei road can be configured to separately NPN/PNP logic, also has short-circuit protection function.By 32 arm processors IN1, QCFG1, the IN2 of IO-LINK chip is set, the low and high level of QCFG2 pin is controlled QN1, QP1, QN2 and QP2 pin ON and OFF state, complete the NPN of two-way output and the state setting of PNP logical transition and NO/NC, specifically arrange in Table 1:

Table 1

IN1	QCFG1	QN1(NPN)	QP1(PNP)
				L	H/L	OFF	OFF
H	H	OFF	ON
				H	L	ON	OFF
IN2	QCFG2	QN2(NPN)	QP2(PNP)
				L	H/L	OFF	OFF
H	H	OFF	ON
				H	L	ON	OFF

L: represent low level H: represent high level

Above-mentioned hardware circuit, 32 arm processors can respond the interruption of two buttons, and identification arranges pattern, carries out pattern demonstration, and control output logic and the state of pio chip by charactron, and 32 arm processors have following function:

1, output delay process

Output time delay divides 2 kinds of front time delay and rear time delays, and front and back time delay respectively has 10 grades optional, in seconds, represents with s: 0s, 1s, 5s, 10s, 15s, 20s, 25s, 30s, 35s, 40s.

When current delay and rear time delay are all set to 0s, without time delay, export.When current delay or rear time delay are all set to be greater than 0s, while object being detected first, start front time delay counting, until delay time when arriving, is carried out output and controlled; When object leaves, start rear time delay counting, when delay time arrives, carry out output and control.

2, single bistable state hand-off process

Increase bistable, make the range of application of diffuse reflection type photoelectric sensor wider; In the bistable occasion of needs, by button setting, switch to bistable operation pattern, program will switch in the middle of bistable state output algorithm in the process of carrying out, and carries out the output control of bistable; In the monostable occasion of needs, by button, be set to monostable mode of operation, program will switch in the middle of monostable state output algorithm in the process of implementation, the output control of fill order's equilibrium mode.

3, distance arranges

Distance setting is that ARM chip arranges by IIC communication transmission range the special chip that order receives to transmitting, special chip is received after order, just start, according to the suitable transmitter current of the far and near selection of the distance of object, to calculate suitable reference point, after arranging successfully, start working, whole adjustment process, without human intervention, precision is high, high conformity, has designed two kinds of detection distances for different application pattern has been set.The first be without back pitch from pattern is set, simple, the second is the pattern that the distance of having powerful connections arranges, accurately, stable, reliable.

Refer to shown in Fig. 3, Fig. 4,32 arm processors send apart from signalization to emission control and receiving processor by IIC communication bus again, by emission control and receiving processor according to object apart from selecting transmitter current grade.

In Fig. 3 when being without back pitch during from signalization apart from signalization, by emission control and receiving processor, according to object, apart from selecting, after transmitter current grade (totally 31 grades), by 32 arm processors, according to transmitter current rating calculation, go out corresponding transmitter current reference point.

In Fig. 4 when apart from signalization when having powerful connections apart from signalization, by emission control and receiving processor, according to object, apart from selecting, after transmitter current grade (totally 31 grades), by 32 arm processors, according to transmitter current rating calculation, go out corresponding transmitter current reference point; 32 arm processors also calculate corresponding background reference point according to the value of background reception signal; By transmitter current reference point and background reference point, calculate corresponding reference point.

Specifically, distance setting is by IIC communication transmission range, the special chip that order receives to transmitting to be set by ARM chip, special chip is received after order, just start according to the far and near transmitter current grade (0--31) of selecting of the distance of object, the principle of selecting transmitter current is transmitting successively from small to large, and the signal value (0--1023) that each current class is reflected compares with the fixed reference value (400) that program sets, the current class that approaches most fixed reference value is suitable transmitter current, after transmitter current is determined, by repeatedly calculating the method for averaging, accurately calculate the signal value (0--1023) that object or background reflectance are returned, and according to this signal value, calculate our stable indication, activation threshold value and return difference thresholding.

Under background condition, distance arranges calculating principle and is:

Threshold=Stabile_Threshold-10;

Hys_Threshold=Threshold-15;

Stabile_Threshold is the signal value that object reflects, as our stable threshold;

Threshold is activation threshold value, when the reflected signal value of detected material is greater than activation threshold value, carries out output and controls;

Hys_Threshold is return difference threshold value, when the reflected signal value of detected material is less than return difference threshold value, turn-offs output and controls;

Have powerful connections under condition, distance arranges calculating principle and is:

Compare_Threshold=Stabile_Threshold-background_Threshold;

Background_Stabile_Threshold=Stabile_Threshold-Compare_Threshold*0.48;

Threshold=Background_Stabile_Threshold-10;

Hys_Threshold=Threshold-15;

Stabile_Threshold and Threshold_background are the signal values that the signal value that reflects of object and background reflectance are returned;

Compare_Threshold is the difference of object and background returns, only in the reflection strength of object, be greater than under the reflection strength condition of background signal, and the difference of object and background returns is greater than at 100 o'clock, just can carry out back pitch from setting;

Threshold is activation threshold value, when the reflected signal value of detected material is greater than activation threshold value, carries out output and controls;

Hys_Threshold is return difference threshold value, when the reflected signal value of detected material is less than return difference threshold value, turn-offs output and controls;

Under the object environmental baseline close with background reflectance intensity, when object leaves, still can receive the signal that background reflectance is returned, due to the critical pass breakpoint of reflected signal in detecting, so be difficult to avoid the wrong possibility of adopting, affect the accuracy of testing result simultaneously, thereby can cause the misoperation of product, and for this situation, we by back pitch from pattern is set, the parameter that combining target thing and background reflectance are returned, according to the computing method under above-mentioned background condition, can solve this problem, assurance testing result is accurate, reliably, greatly improved the stability of product.

And whole adjustment process, without human intervention, precision is high, high conformity.

In a word, advantage of the present invention is as follows:

1, in order to solve the single problem of conventional diffuse reflection type photoelectric sensor output logic, this programme is selected to cut from hardware aspect, employing integrated level is high and can pass through programme controlled doubleway output chip, the NPN/PNP logic of every road output channel can be switched arbitrarily, be independent of each other, for different application scenarios, different output logics is set.

2, for solving the time delay of conventional diffuse reflection type photoelectric sensor no-output, causing the bad problem of consistance without bistable state output function and potentiometer adjustable range, this programme is selected to cut from software, 32 high speed ARM chips of a Cortex-M0 kernel have been selected, its aboundresources, travelling speed are fast, 8 PIC single-chip microcomputers before comparing, its process complicated algorithm with the obvious advantage, efficiency is high.By the mode of software control, then coordinate rationally efficient output time delay control algolithm and single bistable state handoff algorithms, just can realize output time delay setting and single bistable state and switch.And arrange for distance, can pass through self-studying mode, do not need potentiometer to regulate, namely do not need artificial intervention, but pass through a kind of special algorithm, allow sensor Lookup protocol, solved the bad problem of consistance.

Those of ordinary skill in the art will be appreciated that, above embodiment is only for object of the present invention is described, and not as limitation of the invention, as long as in essential scope of the present invention, variation, modification to the above embodiment all will drop in the scope of claim of the present invention.

Claims (8)

1. a multi-functional diffuse reflection type photoelectric sensor, comprises shell, it is characterized in that:

In described shell, comprise LED radiating circuit, receiving circuit, emission control and receiving processor, 32 arm processors, NPN/PNP doubleway output chip and button setting and display circuits, described 32 arm processors are connected with emission control and receiving processor by IIC communication bus; Described 32 arm processors are also connected with NPN/PNP doubleway output chip, control the output state of NPN/PNP doubleway output chip; Described emission control and receiving processor are connected with LED radiating circuit and receiving circuit respectively; Described 32 arm processors are also connected with button setting and display circuit.

2. multi-functional diffuse reflection type photoelectric sensor according to claim 1, is characterized in that:

Before described 32 arm processors are realized output, time delay is or/and time delay after output.

3. multi-functional diffuse reflection type photoelectric sensor according to claim 2, is characterized in that:

Before described output, time delay divides 10 grades, is respectively 0s, 1s, 5s, 10s, 15s, 20s, 25s, 30s, 35s, 40s.

4. multi-functional diffuse reflection type photoelectric sensor according to claim 2, is characterized in that:

After described output, time delay divides 10 grades, is respectively 0s, 1s, 5s, 10s, 15s, 20s, 25s, 30s, 35s, 40s.

5. multi-functional diffuse reflection type photoelectric sensor according to claim 1, is characterized in that:

Described 32 arm processors send apart from signalization to emission control and receiving processor by IIC communication bus, by emission control and receiving processor according to object apart from selecting transmitter current grade.

6. multi-functional diffuse reflection type photoelectric sensor according to claim 5, is characterized in that:

Described is during from signalization, by emission control and receiving processor, according to object, apart from selecting, after transmitter current grade, by 32 arm processors, according to transmitter current rating calculation, to go out corresponding transmitter current reference point without back pitch apart from signalization.

7. multi-functional diffuse reflection type photoelectric sensor according to claim 5, is characterized in that:

Described apart from signalization when having powerful connections apart from signalization, by emission control and receiving processor, according to object, apart from selecting, after transmitter current grade, by 32 arm processors, according to transmitter current rating calculation, go out corresponding transmitter current reference point;

32 arm processors also calculate corresponding background reference point according to the value of background reception signal;

By transmitter current reference point and background reference point, calculate corresponding reference point.

8. multi-functional diffuse reflection type photoelectric sensor according to claim 1, is characterized in that:

Described button setting and display circuit are connected and send bistable output control or monostable pattern output control to described 32 arm processors.

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