CN201829104U - Photoelectric sensor teaching experiment platform - Google Patents
Photoelectric sensor teaching experiment platform Download PDFInfo
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- CN201829104U CN201829104U CN2010205565142U CN201020556514U CN201829104U CN 201829104 U CN201829104 U CN 201829104U CN 2010205565142 U CN2010205565142 U CN 2010205565142U CN 201020556514 U CN201020556514 U CN 201020556514U CN 201829104 U CN201829104 U CN 201829104U
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Abstract
The utility model discloses a photoelectric sensor teaching experiment platform comprising a power supply, a photosource, a photoelectric conversion unit, a measurement and calculation unit and an input and output unit, wherein the switching-in end of the power supply is provided with a power supply polarity self-adaptation circuit so as to fix the positive pole and negative pole of the power supply input to the experiment platform; a light-emitting element and an photosource control circuit in the photosource, as well as a photoelectric sensor and a conditioning circuit in the photoelectric conversion unit are connected by adopting a plugging manner, and the lengths of the two plugging pins of the devices are different, corresponding sockets are accordingly arranged so as to avoid reverse plugging; the sockets of the devices are connected with a static absorption circuit respectively so as to prevent influence of static on the devices; and the input end of an analog-to-digital conversion module in the measurement and calculation unit is connected with an outrange voltage clamp protection circuit, and the input voltage is controlled within the range capacity of the analog-to-digital conversion module. The photoelectric sensor teaching experiment platform not only can meet the requirements of principles and application experiments of various photoelectric sensors in teaching, but also can solve the safety problems existing in the prior art simultaneously.
Description
Technical field
The utility model relates to a kind of teaching experiment platform, relates in particular to a kind of photoelectric sensor teaching experiment platform.
Background technology
In current teaching, in order to allow electronics, info class student can grasp the principle and the application of photoelectric sensor conscientiously, make the student can grasp bookish principle knowledge, can perceptual knowledge be arranged to concrete photovalve and change-over circuit again, need the photoelectric sensor teaching experiment platform to allow the student carry out the practical operation experiment, thereby the parameter of profound understanding physical circuit and composition have more fully understanding to sensing system, fully realize the actual application environment of electro-optical system.
Photoelectric sensor teaching experiment platform commonly used at present comprises power supply, light source, photoelectric conversion unit and measurement instrument, wherein power supply uses external D.C. regulated power supply, light source comprises control circuit for light source and the light-emitting component that is connected with control circuit for light source, photoelectric conversion unit comprises modulate circuit and the photoelectric sensor that is connected with modulate circuit, and control circuit for light source, modulate circuit are connected with measurement instrument respectively.Control circuit for light source control light-emitting component sends light signal, photoelectric sensor is converted to the light signal that receives electric signal and exports measurement instrument to behind modulate circuit such as amplification, filtering, can read the electric signal of photoelectric conversion unit and control circuit for light source output by measurement instrument.In actual the use, often need to prepare multiple light-emitting component (as infrared transmitting tube, the yellowish green royal purple of blood orange LED lamp of all kinds etc.) and multiple photoelectric sensor (as photoresistance, photodiode, phototriode, photoelectric cell, reflective/the transmission-type optoelectronic switch, rpyroelectric infrared device etc.) according to textbook content, for the ease of installing and changing, these devices all are connected with corresponding circuit by plugging mode.By this experiment porch, can make function, characteristic of the more convenient all kinds of common photoelectric sensors of understanding of student's ratio etc., help the study of correlated curriculum.But this experiment porch has only been paid close attention to the self-characteristic of photoelectric sensor components and has been measured, and these characteristics are to find by the device handbook of various devices, therefore can only carry out most basic replication experiment by this class experiment porch, be unfavorable for the cultivation of student's designability and creation, can't embody photoelectric sensor position in actual applications.
In order to overcome the defective of above-mentioned experiment porch, someone improves on the basis of above-mentioned platform, computing machine and analog-to-digital conversion module have been increased, control circuit for light source, modulate circuit are connected with the input end of analog-to-digital conversion module respectively, analog-to-digital conversion module is transferred to computing machine after the analog electrical signal of importing is converted to digital signal, after computing machine carries out computing by predefined algorithm to signal, obtain the major parameter of photoelectric sensor components and show output by output device.
In using existing experiment porch process, find to have more potential safety hazard, mainly comprise:
One, external power supply is because the position of its positive and negative terminal of difference of manufacturer might be opposite, and often only notes profile during student experimenting and ignore the setting of positive and negative terminal, may cause that positive and negative termination is anti-ballistic to cause device damage even personal injury.
Two, the plug-in pin of light-emitting component, photoelectric sensor all has the requirement of polarity usually, and two on each device (light-emitting component just/the P/N utmost point of negative pole, photoelectric sensor) plug-in pin shape length is identical, very easily anti-inserted at present, causes device failure.
Three, light-emitting component and photoelectric sensor are as the connector of frequent plug, and frequent contacts with human body, and pin also frequently contacts plug with socket, very easily produces static, thereby influences the serviceable life of device.
In sum, there is potential safety hazard in existing photoelectric sensor teaching experiment platform, and letter is waited to improve.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of use safer photoelectric sensor teaching experiment platform.
Photoelectric sensor teaching experiment platform of the present utility model, comprise power supply, light source, photoelectric conversion unit, measure computing unit and input-output unit, light source comprises control circuit for light source and the light-emitting component that is connected with control circuit for light source by plugging mode, photoelectric conversion unit comprises modulate circuit and the photoelectric sensor that is connected with modulate circuit by plugging mode, measure and calculate the calculation control module that unit pack is drawn together analog-to-digital conversion module and is connected with analog-to-digital conversion module, control circuit for light source, modulate circuit is connected with the input end of analog-to-digital conversion module respectively, it is characterized in that, described power access end comprises the electric power polarity adaptive circuit, and the power positive cathode of input experiment porch is fixed.
Preferably, the positive pole of described light-emitting component is different with the length of negative pole plug-in pin, and the luminescent device socket in the control circuit for light source is also done relative set; The P utmost point of described photoelectric sensor is different with the length of N utmost point plug-in pin, and the photoelectric sensor socket in the modulate circuit is also done relative set.
Preferably, described light-emitting component socket, photoelectric sensor socket all are connected with static absorption circuit.
Preferably, the input end of described analog-to-digital conversion module is connected with outrange voltage clamp holding circuit, input voltage is controlled in the range ability of analog-to-digital conversion module.
Preferably, described calculation control module is a single-chip microcomputer, and described input-output unit comprises display, keyboard and the execution unit that is connected with single-chip microcomputer respectively.
Photoelectric sensor teaching experiment platform of the present utility model not only can satisfy the requirement of experiment of all kinds of photoelectric sensors in the teaching, and can carry out deep experimental design, improve student's practical operative ability, also solved the safety problem that exists in the prior art simultaneously, the experimental situation of a safety is provided.
Description of drawings
Fig. 1 is the structured flowchart of photoelectric sensor teaching experiment platform of the present utility model;
Fig. 2 is the schematic layout pattern of photoelectric sensor teaching experiment platform of the present utility model;
Fig. 3 is the software flow pattern of photoelectric sensor teaching experiment platform of the present utility model;
Fig. 4 is the structural representation of electric power polarity adaptive circuit in the utility model embodiment;
Fig. 5 is the structural representation of light-emitting component in the utility model embodiment, photoelectric sensor plug-in pin;
Fig. 6 is the circuit theory diagrams that static absorbs circuit in the utility model embodiment;
Fig. 7 is an outrange voltage clamp holding circuit structural representation in the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing the technical solution of the utility model is elaborated:
Photoelectric sensor teaching experiment platform of the present utility model as shown in Figure 1, comprises power supply (not drawing among the figure), light source, photoelectric conversion unit, measurement computing unit and input-output unit.
Described power supply uses external D.C. regulated power supply, for avoiding connecing the anti-circuit damage that causes because of power positive cathode, the design of D.C. regulated power supply incoming end has the electric power polarity adaptive circuit, as shown in Figure 4, the self adapting circuit of polarity that additional power source U forms through diode is transformed to the fixing experiment porch power Vcc of positive and negative terminal output, when bearing just down on the external D.C. regulated power supply end, positive signal becomes the experiment porch cathode power supply through diode D2, after experimental circuit, return the experiment porch negative power supply, return external power supply end negative terminal through diode D4 again; Negative timing down on the external power supply end, positive signal becomes the experiment porch cathode power supply through diode D3, returns the experiment porch negative power supply after experimental circuit, returns external power supply end negative terminal through diode D1 again.
Described light source comprises light-emitting component and power control circuits such as infrared transmitting tube, the yellowish green royal purple of blood orange LED lamp of all kinds, can or adjust light intensity by power control circuit opening/closing light-emitting component; Light-emitting component is connected with power control circuit by plugging mode; As shown in Figure 5, the pin of each light-emitting component is all done the long and short hands setting, it is the stitch that anodal plug-in pin and negative pole plug-in pin adopt different length, corresponding socket is also done relative set, thereby guarantee that light-emitting component can only insert socket in unique correct mode, prevent because the wrong plug direction causes element or circuit impaired; Certainly, also alternate manner be can adopt, for example, two plug-in pin cross sections different shapes or size are designed to respectively.The light-emitting component socket absorbs circuit with a static and is connected, and as shown in Figure 6, by the TVS diode momentary current is drawn away from Sensitive Apparatus.The TVS diode is in parallel with protected signal wire in the circuit board; after instantaneous voltage surpasses the circuit normal working voltage; avalanche breakdown just takes place in the TVS diode; offer super-low resistance path of momentary current; consequently momentary current is drawn away by diode; avoid protected device, and recover to make protected loop remain off voltage always before the normal value at voltage.After transient pulse finished, the TVS diode automatically replied high-impedance state, and whole loop enters normal voltage.Also can use special-purpose antistatic device, anti-thunder tube etc. to realize that static absorbs herein.
But described photoelectric conversion unit comprises modulate circuit and the photoelectric sensor of the multiple mutual alternative that is connected with modulate circuit by plugging mode, photoelectric sensor is converted to electric signal with the light signal that light-emitting component sends, and is adjusted into through modulate circuits such as amplification, filtering and can handles electric signal output; As shown in Figure 5, the pin of each photoelectric sensor is all done the long and short hands setting, it is the stitch that P utmost point plug-in pin and N utmost point plug-in pin adopt different length, corresponding socket is also done relative set, thereby guarantee that photoelectric sensor can only insert socket in unique correct mode, prevent because the wrong plug direction causes element or circuit impaired; Similar with light-emitting component, the socket of photoelectric sensor also absorbs circuit with a static as shown in Figure 6 and is connected, and plays the effect that prevents electrostatic damage.
Measure the calculating unit pack and draw together analog-to-digital conversion module and calculation control module, analog-to-digital conversion module employing model is the analog to digital converter of ADC0809 in this embodiment, and it is the single-chip microcomputer of SST89E564RD that calculation control module adopts model.SST89E564RD single-chip microcomputer and 51 single-chip microcomputers are compatible fully, and support on-line debugging, and the student can fully understand software frame and control flow; Can make the modification of independence to experiment software.The signal of input analog-to-digital conversion module has two-way, and first via signal is the voltage signal in the control circuit for light source, the second road signal be photoelectric sensor output through the adjusted voltage signal of modulate circuit.Through circuit model and algorithm process, the major parameter that draws photoelectric sensor components is sent into the output unit in the input-output unit to the SST89E564RD single-chip microcomputer with the second road signal.Carry out analog-to-digital device certain input voltage range is all arranged; when sensor signal when the conditioning process enters A/D converter controller; input voltage should remain in the range ability; therefore; input end in the analog-to-digital conversion module analog quantity increases outrange voltage clamp holding circuit, input voltage is controlled in the range ability of analog-to-digital conversion module.Outrange voltage clamp holding circuit inserts diode D11, D22 respectively as shown in Figure 7 between first via signal input part Vi1 and power Vcc, Vss, the P utmost point of D11 is connected with signal input part Vi1, and the N utmost point is connected with Vcc; During the normal signal input, D11, D22 all end; When input signal exceeds maximal value, the D11 conducting with the input signal clamper on maximal value; When input signal exceeds minimum value, the D22 conducting with the input signal clamper on minimum value; Equally, insert diode D33, D44 respectively between the second road signal input part Vi2 and power Vcc, Vss, the P utmost point of D33 is connected with signal input part Vi2, and the N utmost point is connected with Vcc.Guarantee in the whole measuring process that input quantity is in the scope that range allows.
Described input-output unit comprises display, keyboard and the execution unit that is connected with single-chip microcomputer respectively, and display adopts character mode lcd display, display light source signal value and photoelectric sensor major parameter; Keyboard adopts the keypad of 12 keys, comprises numerical key and " determining ", " returning " key of 0～9; Adopt electronic audio and LED as execution unit, in the photoelectric sensor application system, make the different actions of carrying out according to the signal of sensor.
Except that external D.C. regulated power supply, above-mentioned each components and parts and circuit all are welded on the same side of a circuit board, and the integral layout of experiment porch as shown in Figure 2, wherein, 1 is the electric power polarity adaptive circuit, and 2 is light-emitting component, 3 is control circuit for light source, 4 is photoelectric sensor, and 5 is modulate circuit, and 6 is analog to digital converter, 7 is single-chip microcomputer, 8 is LCD display, and 9 is keypad, and 10 is execution unit.In order to reduce the influence of bias light, also comprise dismountable shadow shield 11 that can cover in light-emitting component and photoelectric sensor simultaneously on the experiment porch.
When using experiment porch of the present utility model to experimentize, at first choose a light-emitting component and a photoelectric sensor, it is installed on the corresponding socket.Light-emitting component links to each other by light signal with photoelectric sensor, is covered by shadow shield simultaneously.The electric signal of light source enters first via A/D passage; Photoelectric sensor is converted to electric signal as the second road signal with light signal, is the voltage range that is fit to analog to digital converter through modulate circuit and outrange voltage clamp holding circuit coupling, input analog-to-digital converter.Choose the experiment that need carry out by the operation of keypad and the demonstration of LCD display, after determining to test beginning, Single-chip Controlling analog to digital converter synchronized sampling two paths of signals calculates the device parameters of asking for photoelectric sensor by circuit theory; The major parameter that shows two paths of signals value and photoelectric sensor by LCD in real time; The power of light signal changes gradually by control circuit for light source.Above process can be finished the principle experiment of photoelectric sensor, when carrying out the photoelectric sensor application experiment, will be connected to execution unit through the second road signal of adjusting, and also can connect execution unit after Single Chip Microcomputer (SCM) program is handled.
The software flow of measurement computing unit as shown in Figure 3, enter experimental project after single-chip microcomputer starts and select page or leaf, determine and begin an experiment content by keypad, start analog to digital converter, gather light signal and photo-sensor signal will in real time, find the solution parameter value according to the circuit relationships of photoelectric sensor parameter and input quantity.The currency that shows two paths of signals value and photoelectric sensor major parameter on the LCD display in real time." returning " button of keypad can interrupt current experimental project at any time, returns experimental project and selects page or leaf to reselect experiment.The programming structure of measuring computing unit is open, has used the SST single-chip microcomputer, the result that code can online adjustment be handled with algorithms of different relatively.
Below come the use of photoelectric sensor teaching experiment platform of the present utility model is further specified according to the experimentation of photoresistance and transmission-type optoelectronic switch respectively:
The principle of photoresistance and application experiment:
On experiment porch, install light source and photoresistance, cover light-emitting component and photoresistance with shadow shield; The light source power is controlled by control circuit for light source, and control signal is a voltage, and this voltage connects one tunnel analog to digital conversion passage as light signal and enters single-chip microcomputer and write down demonstration; Voltage after photoresistance one end is drawn conversion connects another road analog to digital conversion passage as sensor signal and connects the single-chip microcomputer processing.In experimentation, regulate the light source deepening by control circuit for light source, it is extremely minimum to observe the light signal numerical value that shows on the LCD display, this moment, another passage obtained a magnitude of voltage, according to circuit theory, single-chip microcomputer is by this magnitude of voltage and sampling resistor value, power values, calculates the voltage at photoresistance two ends and flows through the electric current of photoresistance, further calculate the dark resistance value of photoresistance, be presented on the LCD display; Regulate light source by said process and brighten, can obtain light resistance value and demonstration.In the process of whole adjusting, the voltage signal of single-chip microcomputer real-time sampling display light source control circuit and through the voltage signal on photoelectric sensor and the modulate circuit, and calculate in real time according to relevant circuit theory and to show current photoresistance resistance, current value; Note video data and can draw volt-ampere curve.The photoresistance of another model is installed on socket, can investigates the difference of parameter between unlike signal.Photoresistance has spectral characteristic, and is different to the sensitivity of the light-receiving of different wave length, replaces current light-emitting component with the light-emitting component of other colors, repeats the preliminary surveying that above-mentioned adjustment process can be carried out spectral characteristic.
The principle of transmission-type optoelectronic switch and application experiment:
On experiment porch, install light-emitting component and transmission-type optoelectronic switch, cover the receiver of light-emitting component and transmission-type optoelectronic switch with shadow shield; The source ends voltage control signal enters single-chip microcomputer through the analog to digital conversion passage; The voltage signal of transmission-type optoelectronic switch receiving sensor end divides two-way, and one the tunnel enters single-chip microcomputer through the analog to digital conversion passage, and one the tunnel connects an input pin of single-chip microcomputer through modulate circuit.Two-way voltage signal through analog to digital converter is shown by LCD display output through single-chip microcomputer; Modulate circuit is with the voltage signal and the relatively back output switching signal of threshold voltage of transmission-type optoelectronic switch receiving sensor end, threshold voltage is adjustable, switching signal enters single-chip microcomputer from outside port, single-chip microcomputer is to the switch signal-count, show current on off state through LCD display, drive outside electronic audio pronunciation with crossing execution unit.Fixing the intensity of light source makes between the receiver of itself and transmission-type optoelectronic switch and keeps opening state, switching signal links to each other with electronic audio driving circuit in the execution unit, fan blade is installed at the micromachine top, blade is placed perpendicular to the light path of light source and receiver, starter motor, the voltage signal of receiving sensor end forms through modulate circuit has the switching signal of certain frequency, single-chip microcomputer is to the switch signal-count and be converted into frequency signal, be presented on the LCD display, electronic audio sends the sound of different tones according to different frequencies simultaneously.
Similarly, by this experiment porch, photodiode can be measured its dark current, photocurrent; Phototriode can be measured its light characteristics, volt-ampere characteristic; Photoelectric cell can be measured its open-circuit voltage, short-circuit current, has designed photoelectric cell and has typically used circuit.Each device all can carry out preliminary spectral characteristic and measure.All kinds of photoelectric sensors all can constitute complete Electro-Optic Sensor System in conjunction with photoelectric conversion unit, measurement computing unit, input-output unit.Each components and parts is when the dismounting transposing, and the static electricity on human body of generation, contact static can be absorbed circuit by static and absorb, and the unique installation method that has the long and short hands design has guaranteed the correctness that components and parts are installed in the circuit.Selected typical components and parts in the undergraduate course teaching material for use with the relevant element of programming on the experiment porch, the flow process of experiment software and details can be understood fully by the student.
Claims (6)
1. photoelectric sensor teaching experiment platform, comprise power supply, light source, photoelectric conversion unit, measure computing unit and input-output unit, light source comprises control circuit for light source and the light-emitting component that is connected with control circuit for light source by plugging mode, photoelectric conversion unit comprises modulate circuit and the photoelectric sensor that is connected with modulate circuit by plugging mode, measure and calculate the calculation control module that unit pack is drawn together analog-to-digital conversion module and is connected with analog-to-digital conversion module, control circuit for light source, modulate circuit is connected with the input end of analog-to-digital conversion module respectively, it is characterized in that, described power access end comprises the electric power polarity adaptive circuit, and the power positive cathode of input experiment porch is fixed.
2. photoelectric sensor teaching experiment platform according to claim 1 is characterized in that the positive pole of described light-emitting component is different with the length of negative pole plug-in pin, and the light-emitting component socket in the control circuit for light source is also done relative set; The P utmost point of described photoelectric sensor is different with the length of N utmost point plug-in pin, and the photoelectric sensor socket in the modulate circuit is also done relative set.
3. photoelectric sensor teaching experiment platform according to claim 1 is characterized in that, described light-emitting component socket, photoelectric sensor socket all are connected with static and absorb circuit.
4. photoelectric sensor teaching experiment platform according to claim 1 is characterized in that the input end of described analog-to-digital conversion module is connected with outrange voltage clamp holding circuit, input voltage is controlled in the range ability of analog-to-digital conversion module.
5. photoelectric sensor teaching experiment platform according to claim 1 is characterized in that described calculation control module is a single-chip microcomputer, and described input-output unit comprises display, keyboard and the execution unit that is connected with single-chip microcomputer respectively.
6. photoelectric sensor teaching experiment platform according to claim 1 is characterized in that, also comprises dismountable shadow shield that can cover in light-emitting component and photoelectric sensor simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205565142U CN201829104U (en) | 2010-09-30 | 2010-09-30 | Photoelectric sensor teaching experiment platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205565142U CN201829104U (en) | 2010-09-30 | 2010-09-30 | Photoelectric sensor teaching experiment platform |
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| CN201829104U true CN201829104U (en) | 2011-05-11 |
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| CN2010205565142U Expired - Fee Related CN201829104U (en) | 2010-09-30 | 2010-09-30 | Photoelectric sensor teaching experiment platform |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103943008A (en) * | 2013-07-02 | 2014-07-23 | 长春理工大学 | Photoelectric detection and information processing experiment system |
| CN104900119A (en) * | 2015-04-30 | 2015-09-09 | 宁波职业技术学院 | Photoelectric measuring application experiment apparatus |
-
2010
- 2010-09-30 CN CN2010205565142U patent/CN201829104U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103943008A (en) * | 2013-07-02 | 2014-07-23 | 长春理工大学 | Photoelectric detection and information processing experiment system |
| CN104900119A (en) * | 2015-04-30 | 2015-09-09 | 宁波职业技术学院 | Photoelectric measuring application experiment apparatus |
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Granted publication date: 20110511 Termination date: 20120930 |