CN103744123B - Multi-functional diffuse-reflectance formula photoelectric sensor - Google Patents

Abstract

The invention discloses a kind of multi-functional diffuse-reflectance formula photoelectric sensor, including shell, including LED emission circuit in described shell, receive circuit, emission control and receive processor, 32 arm processors, NPN/PNP doubleway output chip and button and arrange and display circuit, described 32 arm processors are by IIC communication bus and emission control and receive processor and be connected；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 reception processor are connected with LED emission circuit and reception circuit respectively；Described 32 arm processors also arrange with button and display circuit is connected.This sensor is integrated with delay function, output monostable and bistable state handoff functionality etc. after doubleway output function, the front time delay of output and output simultaneously, the a large amount of models distinguished and specification is needed to be all integrated in a product existing production and design link, greatly simplify production, reduce stock's model.

Description

Multi-functional diffuse-reflectance formula photoelectric sensor

Technical field

The present invention relates to diffuse-reflectance formula photoelectric sensor, more specifically, relate to a kind of multi-functional Diffuse-reflectance formula photoelectric sensor.

Background technology

Diffuse-reflectance formula photoelectric sensor, is emitter and receptor is placed in one, connects under normal circumstances Receive device and can not receive the optical signal that emitter sends, when detectable substance enters detection range, launch light Being mapped to its surface, form diffuse-reflectance effect, some light is reflected back, and receptor receives light letter Number, export a switch controlling signal.The electric transducer that diffuses has distance regulatory function, Industry Control is on-the-spot or other application scenario needs to carry out detecting distance regulation, determines detection range, It is achieved in that by regulation receiving terminal sensitivity, changes detecting distance.

Existing diffuse-reflectance formula photoelectric sensor, mostly uses single output logic, and NPN patrols Collecting or PNP logic, the sensor that the factory lines that we are common is used is the most not Unified, have plenty of NPN logic, have plenty of PNP logic；Object detected, be just immediately performed defeated Go out, no-delay output function；Output state is monostable, namely a kind of steady statue, When an object is detected, transient state is entered, when detectable substance is removed, by transient recovery to steady statue； Setting to detectable substance distance, is to regulate the intensity of transmitting tube electric current by potentiometer to carry out distance Arrange, or the sensitivity of regulation reception amplifier circuit carries out distance and arranges.Potentiometer regulates Being affected by anthropic factor, concordance hardly results in guarantee, specific as follows:

1) diffuse-reflectance formula photoelectric sensor output logic has NPN and PNP two kinds, conventional diffuse-reflectance The output logic of formula photoelectric sensor is often a kind of, or NPN, or PNP；Output mode Having NO (normally opened) and NC (normally closed) two kinds, formula photoelectric sensor NO/NC is optional in some diffuse-reflectance, Some NO/NC is fixing.

2) conventional diffuse-reflectance formula photoelectric sensor, detects object, is just immediately performed output control System;Object leaves, and output recovers, and does not export time delay optional function.

3) conventional diffuse-reflectance formula photoelectric sensor output state is monostable, when target object enters Output triggers, and when object leaves, output disconnects again.

4) the conventional diffuse-reflectance formula photoelectric sensor setting to object distance, mainly has two kinds of realities Existing scheme, a kind of is to carry out distance by the intensity of potentiometer regulation transmitting tube electric current to arrange；Another Kind, it is to carry out distance by the sensitivity of potentiometer regulation reception amplifying circuit to arrange.

There is following defect in existing diffuse-reflectance formula photoelectric sensor:

1) logic is single, if the use occasion of user changes, and lucky original sensor logic If not meeting again existing requirement, just can only change a collection of sensor meeting logical requirements and replace Original sensor, also can bring no small loss to user simultaneously；Or the old and new on production line When machine substitutes, sensor logic output there may be conflict, arises that a part uses NPN type, a part uses positive-negative-positive, the most also can make troubles to user.

2) without output delay function, have a lot of application scenario, sensor have in using other because of Element false triggering sensor, at this moment sensor user needs to arrange output time delay and eliminates these and can not keep away The misoperation exempted from, just cannot adapt to these application scenarios without output delay function.

3) when bistable state is target object entrance, output triggers, and exports constant, thing when object leaves When body is again introduced into, output just disconnects, and often carrys out an object output and once changes, can be as production Bistable state enumerator on line or the flip flop sensor etc. of elevator detection, these are monostables Sensor institute is irrealizable.

4), there is consistency problem in potentiometer adjustable range, operators different during site setup Member can reserve different detection surpluses to sensor distance, if surplus is too small can affect detection reliably Property.The signal detection part of sensor is easily introduced electromagnetic interference, and the addition of potentiometer makes electricity When road design and shielding design, electromagnetic interference intractability increases a lot, if processing bad, and product Capacity of resisting disturbance can be the most weak.

As can be seen here, existing diffuse-reflectance formula photoelectric sensor function singleness, very flexible, not Same occasion, will distinguish the sensor selecting different model, and user is when type selecting, and device upgrade becomes Time more, the sensor selecting different model will be distinguished, very inconvenient.And existing market needs Be to design a multi-functional diffuse-reflectance formula photoelectric sensor, can compatible all outputs patrol simultaneously Volume, and possess all conventional functions and pattern, improve original by new distance setting means The defect that potentiometer distance sets, can use to user and bring the most conveniently, before having preferable market Scape.

Summary of the invention

For defect present in prior art, it is an object of the invention to provide a kind of multi-functional unrestrained anti- Penetrate formula photoelectric sensor.

For reaching above-mentioned purpose, the present invention adopts the following technical scheme that:

A kind of multi-functional diffuse-reflectance formula photoelectric sensor, including shell, includes LED in described shell Radiating circuit, reception circuit, emission control and reception processor, 32 arm processors, NPN/PNP Doubleway output chip and button are arranged and display circuit, and described 32 arm processors pass through IIC Communication bus is connected with emission control and reception processor；Described 32 arm processors also with NPN/PNP doubleway output chip is connected, and controls the output state of NPN/PNP doubleway output chip； Described emission control and reception processor are connected with LED emission circuit and reception circuit respectively；Institute State 32 arm processors to be also connected with button setting and display circuit.

Described 32 arm processors realize time delay before output or/and time delay after Shu Chu.

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

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

Described 32 arm processors to emission control and receive processor by IIC communication bus Send distance and signal is set, emission control and reception processor select to launch according to object distance Current class.

When described distance arranges signal for arranging signal without background distance, by emission control and receiving area After reason device selects emission current grade according to object distance, by 32 arm processors according to sending out Radio stream rating calculation goes out corresponding emission current datum mark.

Described distance arranges signal when arranging signal for distance of having powerful connections, by emission control and receiving area After reason device selects emission current grade according to object distance, by 32 arm processors according to sending out Radio stream rating calculation goes out corresponding emission current datum mark；

The value that 32 arm processors receive signal always according to background calculates corresponding background reference Point；

Corresponding datum mark is calculated by emission current datum mark and background reference point.

Described button is arranged and display circuit is connected sends bistable state to described 32 arm processors Pattern output controls or the output of monostable pattern controls.

Compared with prior art, use the one multi-functional diffuse-reflectance formula photoelectric sensor of the present invention, This sensor is integrated with simultaneously: doubleway output function, can be separately provided the NPN/PNP on each road Logic and NO/NC state；Delay function after the front time delay of output and output；Output monostable and bistable State handoff functionalities etc., need a large amount of models of differentiation and specification complete existing production and design link Portion contains, and is integrated in a product, greatly simplify production, reduces stock's type Number, and facilitate type selecting and the use of client, can also change flexibly during later stage use and patrol Collecting and state, the time delay being simultaneously introduced and bi-stable function make sensor can apply at some special need The occasion asked.It addition, carry out, by button, the method that distance is arranged, easy to operate, and make to set Put result more stable reliably.

Accompanying drawing explanation

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

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

Fig. 3 is 32 arm processors in Fig. 1 arranging flow process during signal without background distance Schematic diagram；

Fig. 4 is the flow processs when distance of having powerful connections arranges signal of 32 arm processors in Fig. 1 Schematic diagram.

Detailed description of the invention

Technical scheme is further illustrated below in conjunction with the accompanying drawings with embodiment.

Refer to the multi-functional diffuse-reflectance formula photoelectric sensor of the one shown in Fig. 1, Fig. 2, including outside Shell 11, is provided with circuit board 30 in shell 11, circuit board 30 includes LED emission circuit 12, Receive circuit 13, emission control and receive processor 14,32 arm processors 15, NPN/PNP Doubleway output chip 16 and button are arranged and 17,32 arm processors of display circuit 15 lead to Cross IIC communication bus to be connected with emission control and reception processor 14；32 arm processors 15 Also it is connected with NPN/PNP doubleway output chip 16, controls the defeated of NPN/PNP doubleway output chip Do well；Emission control and reception processor 14 are electric with LED emission circuit 12 and reception respectively Road 13 is connected；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 one in the Mirror frame structure 20 after optical filter Diversing lens 21 and reception lens 22, the rear side of diversing lens 21 is provided with grating 24, The rear side receiving lens 22 is provided with optical filter 23；

Button arranges and includes numeral method 26, power supply and signal knowledge lamp in display circuit 17 27, button arranges 25；

The electricity for powering it is additionally provided with to whole multi-functional diffuse-reflectance formula photoelectric sensor in shell 11 Source circuit 18.

In fig. 2, NPN/PNP doubleway output chip IC 1 is integrated IO-LINK output circuit Chip, it has the output channel of two-way independence, and every road can be separately configured as NPN/PNP Logic, also has short-circuit protection function.By 32 arm processors, IO-LINK chip is set The low and high level of IN1, QCFG1, IN2, QCFG2 pin controls QN1, QP1, QN2 and QP2 Pin ON and OFF state, complete NPN and PNP logical transition and the NO/NC of two-way output State is arranged, and concrete setting is shown 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, identifies and arranges Pattern, carries out pattern by charactron and shows, and controls output logic and the state of pio chip, 32 arm processors have a following function:

1, output delay process

Output time delay divides front time delay and rear time delay 2 kinds, and it is optional that time delay front and back is respectively arranged with 10 grades, In seconds, represent with s: 0s, 1s, 5s, 10s, 15s, 20s, 25s, 30s, 35s, 40s。

When current delay and rear time delay are both configured to 0s, no-delay output.Current delay or after prolong Time when being both configured to more than 0s, when object being detected first, start front time delay counting, until prolonging Time the time to when, perform output control；When object leaves, start rear time delay counting, prolong Time the time to when, perform output control.

2, single bistable state hand-off process

Increasing bistable, the range of application making diffuse-reflectance formula photoelectric sensor is wider；Needing Wanting bistable occasion, arranged by button and switch to bistable operation pattern, program is in execution During will switch in the middle of bistable state output algorithm, perform bistable output control；? Needing monostable occasion, be set to monostable mode of operation by button, program is in the process of execution In will switch in the middle of monostable state output algorithm, perform monostable pattern output control.

3, distance is arranged

It is that ARM chip is received to launching by IIC communication transmission range setting command that distance is arranged Special chip, after special chip receives order, begins to the distance according to object and selects to close Suitable emission current, calculates suitable datum mark, after arranging successfully, starts working, whole regulation Process, it is not necessary to human intervention, precision is high, concordance is good, two kinds for different Application Design Detecting distance arranges pattern.The first is to arrange pattern without background distance, simple, the second It is the pattern of the distance setting having powerful connections, accurate, stable, reliable.

Referring to shown in Fig. 3, Fig. 4,32 arm processors pass through IIC communication bus to sending out again Penetrate control and receive processor and send distance signal is set, by emission control and receive processor according to Object distance selects emission current grade.

In Fig. 3 when distance arranges signal for arranging signal without background distance, by emission control and connect Receive processor according to object after selecting emission current grade (totally 31 grades), by 32 Arm processor goes out corresponding emission current datum mark according to emission current rating calculation.

In Fig. 4 when distance arrange signal for distance of having powerful connections, signal is set time, by emission control and connect Receive processor according to object after selecting emission current grade (totally 31 grades), by 32 Arm processor goes out corresponding emission current datum mark according to emission current rating calculation；32 ARM The value that processor receives signal always according to background calculates corresponding background reference point；By launching electricity Stream datum mark and background reference point calculate corresponding datum mark.

Specifically, distance is arranged is by IIC communication transmission range setting command by ARM chip Give launch receive special chip, after special chip receives order, begin to according to object away from Select emission current grade (0--31) from distance, select the principle of emission current for depend on from small to large Secondary transmitting, and set by the signal value (0--1023) that each current class is reflected and program Fixed fixed reference value (400) compares, and the current class closest to fixed reference value is suitable Emission current, after emission current determines, accurately calculate by repeatedly calculating the method averaged Go out object or signal value (0--1023) that background reflectance is returned, and calculate according to this signal value Go out our stable instruction, activation threshold value and return difference thresholding.

Without 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, stablizing as us Threshold value；

Threshold is activation threshold value, when the reflected signal value of detected material is more than activation threshold value, Perform output to control；

Hys_Threshold is return difference threshold value, when the reflected signal value of detected material is less than return difference threshold During value, turn off output and control；

Under the conditions of having powerful connections, 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 is that object reflects Signal value and the signal value returned of background reflectance；

Compare_Threshold is the difference of object and background returns, only in target Under the conditions of the reflex strength of thing is more than the reflex strength of background signal, and object and background reflectance When the difference of signal is more than 100, just can carry out the setting of background distance；

Threshold is activation threshold value, when the reflected signal value of detected material is more than activation threshold value, Perform output to control；

Hys_Threshold is return difference threshold value, when the reflected signal value of detected material is less than return difference threshold During value, turn off output and control；

Under the object environmental condition with background reflectance similar intensity, when object leaves, still The signal that background reflectance is returned can be received, owing to reflected signal is in the critical pass breakpoint of detection, So being difficult to avoid wrong adopt probability, affecting the accuracy of testing result simultaneously, thus can cause The misoperation of product, and for this situation, we arrange pattern by background distance, in conjunction with mesh The parameter that mark thing and background reflectance are returned, according to the computational methods under above-mentioned background condition, can be very well This problem of solution, it is ensured that testing result accurately, reliable, substantially increase the stability of product.

And whole regulation process, it is not necessary to human intervention, precision is high, and concordance is good.

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

1, the problem single in order to solve conventional diffuse-reflectance formula photoelectric sensor output logic, we Case selects to cut from hardware aspect, uses integrated level high and can pass through programme controlled doubleway output Chip, the NPN/PNP logic of every road output channel can be independent of each other with any switching laws, for not Same application scenario, arranges different output logics.

2, for solving conventional diffuse-reflectance formula photoelectric sensor without output time delay, without bistable state output work Energy and potentiometer adjustable range cause the problem that concordance is bad, and this programme selects to cut from software, 32 high speed ARM chips of a Cortex-M0 kernel, its aboundresources, operation are selected Speed is fast, for 8 PIC single chip microcomputer before comparing, it process complicated algorithm with the obvious advantage, Efficiency is high.By the way of software controls, then coordinate rationally efficient output delays time to control algorithm and Single bistable state handoff algorithms, can be achieved with exporting time delay and arranges and single bistable state switching.And for away from From setting, self-studying mode can be passed through, it is not necessary to potentiometer regulates, namely need not artificial Intervention, but by a kind of special algorithm, allow sensor automatically arrange, solve concordance Bad problem.

Those of ordinary skill in the art is it should be appreciated that above embodiment is intended merely to The purpose of the present invention is described, and is not used as limitation of the invention, as long as in the essence of the present invention In the range of, to the change of embodiment described above, modification all by the claim in the present invention that falls In the range of.

Claims (3)

1. a multi-functional diffuse-reflectance formula photoelectric sensor, including shell, it is characterised in that:

Include in described shell LED emission circuit, receive circuit, emission control and receive processor, 32 arm processors, NPN/PNP doubleway output chip and button are arranged and display circuit, institute State 32 arm processors to be connected with emission control and reception processor by IIC communication bus； Described 32 arm processors are also connected with NPN/PNP doubleway output chip, control NPN/PNP The output state of doubleway output chip；Described emission control and receive processor respectively with LED emission Circuit and reception circuit are connected；Described 32 arm processors are also arranged with button and display electricity Road is connected,

Described 32 arm processors to emission control and receive processor by IIC communication bus Send distance and signal is set, emission control and reception processor select to launch according to object distance Current class,

When described distance arranges signal for arranging signal without background distance, by emission control and receiving area After reason device selects emission current grade according to object distance, by 32 arm processors according to sending out Radio stream rating calculation goes out corresponding emission current datum mark.

Multi-functional diffuse-reflectance formula photoelectric sensor the most according to claim 1, it is characterised in that:

Described distance arranges signal when arranging signal for distance of having powerful connections, by emission control and receiving area After reason device selects emission current grade according to object distance, by 32 arm processors according to sending out Radio stream rating calculation goes out corresponding emission current datum mark；

The value that 32 arm processors receive signal always according to background calculates corresponding background reference Point；

Corresponding datum mark is calculated by emission current datum mark and background reference point.

Multi-functional diffuse-reflectance formula photoelectric sensor the most according to claim 1, it is characterised in that:

Described button is arranged and display circuit is connected sends bistable state to described 32 arm processors Pattern output controls or the output of monostable pattern controls.