CN2069151U - Electromagnetic wave transmit-receive demonstrating device for teaching - Google Patents
Electromagnetic wave transmit-receive demonstrating device for teaching Download PDFInfo
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- CN2069151U CN2069151U CN 90213837 CN90213837U CN2069151U CN 2069151 U CN2069151 U CN 2069151U CN 90213837 CN90213837 CN 90213837 CN 90213837 U CN90213837 U CN 90213837U CN 2069151 U CN2069151 U CN 2069151U
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- electromagnetic wave
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Abstract
The utility model relates to an electromagnetic wave transmit-receive demonstrating device for teaching in the physical field, comprising an electromagnetic wave transmitting portion, an electromagnetic wave receiving portion and an effect display portion. The utility model is characterized in that the electromagnetic wave transmitting portion of the device is provided with a half-wave vibrator antenna and a modulator, the receiving portion adopts a frequency modulation circuit and an amplitude modulation circuit, and the display portion is provided with a voltmeter and a loudspeaker. The electromagnetic wave transmit-receive demonstrating device displays the advantages of the products of the same kind at home and abroad. The total electromagnetic wave receive-transmit demonstration and the partial experiments of the electromagnetic oscillation can be excellently completed according to the requirements of the teaching program. The demonstration distance of the electromagnetic wave transmit-receive demonstrating device is improved from the original hertzian experiment 1 to 2 meters to 40 meters with vivid and visual display effect.
Description
The utility model belongs to the physics field, definite a kind of electromagnetic wave transmitting-receiving apparatus for demonstrating that is applied to physical experiment teaching in middle schools of saying so.
This area is existing to be used for the instruments used for education that the emission of middle school physics lesson demonstration electromagnetic wave receives, and domestic have Hertzian oscillator, a metric wave generator, and microwave transceiver device is abroad arranged.Though Hertzian oscillator can reproduce experimental prototype, and is more directly perceived, demonstration distance only has 1～2 meter, can not satisfy the demonstration required distance, and what emit is damped wave, can not transmit speech signal, and interest is not strong, and display effect is not obvious.Though the metric wave generator can pass through galvanometer or loudspeaker, the sound that makes signal become observable indication or hear, but because wavelength is oversize, in often wall reflection of indoor demonstration, electromagnetic wave easily forms standing wave, make the space electromagnetic wave form node, serious interference, influence demonstration effect, emissive source produces the launching electromagnetic wave visual pattern not as spark discharge, the directivity of antenna demonstration simultaneously is not obvious, and price is also high.Microwave transceiver device is anti-interference, good directionality, and also indication is electric current or sound.But owing to adopt Waveguide Mechanism and electromagnetic horn, amateur student experimenting is imparted knowledge to students not as such easy understanding that spark discharge is generated electromagnetic waves, be not suitable for the middle school experimental teaching, above-mentioned three kinds of instruments used for education, though characteristics are respectively arranged, but all can not finish syllabus electromagnetic wave chapters and sections experimental teaching content satisfactorily, and the price height, be difficult for popularizing.
Task of the present utility model provides a kind of demonstration distance, strong interference immunity can receive spark discharge, radio station, TV station and wireless microphone signal, and that effect shows is vivid, visual and understandable, visibility is big, reasonable in design, simple in structure, stable performance, handling safety, easy to use, cost are low is convenient to popularize, meet the new teaching electromagnetic wave that syllabus requires and receives and dispatches apparatus for demonstrating.
This device shows that by electromagnetic wave emission, reception, effect three parts form, the electromagnetic wave radiating portion has parts such as primary coil (A), dipole antenna (B), modulator (C), secondary coil (D) to form, and modulator (C) is made up of switch (1), switch (2), normally opened contact (3), relay (4), electric capacity (5) etc.Receiving unit adopts common FMAM receiving lines (6), the effect display part is made up of rectifier (7), voltage table (8), loudspeaker (9), potentiometer (10) etc., characteristics are that electromagnetic wave emission, reception, effect are shown three part organic assembling, the demonstration distance is brought up to about 40 meters by 1～2 meter of former Hertzian oscillator, it is directly perceived that reception has reached display effect, the requirement that image is understandable, this device electromagnetic wave radiating portion is provided with dipole antenna (B) and modulator (C), strengthen the emittance of electromagnetic wave outside circle, improved the demonstration effect.Receiving unit adopts the FMAM circuit can receive spark discharge, radio station, TV station and wireless microphone signal, the display part is provided with voltage table (8) and loudspeaker (9), can utilize the sound size display effect of variation of voltage table pointer and loudspeaker, because this device radiating portion is provided with modulator (C), can also carry out electromagnetic wave damping and lecture experiments such as undamped, electric capacity and period-luminosity relation.In addition, be provided with electric capacity (5) in the modulator (C), can improve frequency and antenna directivity experiment effect.
The utility model has been drawn the advantage of domestic and international prior art, overcome the deficiency of original instrument, design according to middle school physical experiment content needs, emissive source has represented the Hertz oscillation experimental principle, embodied the mechanism of dipole element, dipole element is specialized, and transmitting range is brought up to 40 meters by 1～2 meter of original instrument.This apparatus function is complete, can demonstrate the whole experiments of electromagnetic wave chapters and sections and the experiment of electromagnetic oscillation damping and undamped, electric capacity and period-luminosity relation with three kinds of methods.This apparatus structure novelty, technology is simple, display effect good, visibility is big, reliable and stable, antijamming capability is strong, easy for operation, production cost reduces more than one times than like product, can satisfactorily finish middle school physical electromagnetic ripple lecture experiment according to syllabus.State Education Commission listed this research topic in 85～90 years " teaching instrument and equipment research program outline " in 1984.
The utility model is described in further detail for the contrast accompanying drawing below:
Accompanying drawing 1 is the utility model teaching electromagnetic wave radiating portion conspectus.
Accompanying drawing 2 is for the utility model receives, effect display part conspectus.
As shown in Figure 1: (1) is that electromagnetic wave radiating portion modulator switch, (2) are capacitor for normally opened contact, (4) for relay, (5) for switch, (3).
As shown in Figure 2: (6) are that receiving unit FMAM receiving lines, (7) are potentiometer for voltage table, (9) for loudspeaker, (10) for effect display part rectifier, (8).Whole teaching electromagnetic wave transmitting-receiving apparatus for demonstrating shows that by electromagnetic wave emission, reception, effect three parts form, and the electromagnetic wave radiating portion is made up of primary coil (A), dipole antenna (B), modulator (C), secondary coil (D) four parts.Just, inferior coil system is used induction coil with imparting knowledge to students, primary coil (A) adopts 6～8 volts of direct current supplys, dipole antenna (B) adopts the movable joint antenna, two movable joint antenna one ends connect with the secondary coil two ends, form open electric circuit, modulator (C) is combined by switch (1), switch (2), normally opened contact (3), relay (4), electric capacity (5), and electric capacity (5) comprises C
1, C
2, C
3Three, binding post+extremely connect with an end of switch, switch, normally opened contact, the other end of switch, normally opened contact connects with relay one end; The other end of relay and capacitor C
1, C
2, C
3An end connect C
1, C
2, C
3The other end combine with switch respectively as required, dipole antenna and secondary coil two ends at interval 5～10 millimeters be sparking distance.
Receiving unit is designed to amplitude-modulation frequency modulation receiver, for reducing cost, can select 4～6 pipe simple and easy wiring boards of amplitude modulationfrequency modulation (6) for use, in order to receive spark discharge, radio station TV station, the wireless microphone signal, the effect display part is by rectifier (7), voltage table (8), loudspeaker (9), potentiometer compositions such as (10), rectifier (7) is formed bridge rectifier by four 2AP1 diodes, voltage table (8) two ends are parallel to the output terminal of rectifier, the input end of rectifier is in parallel with loudspeaker, connect with the power take-off of receiving unit again, for control voltage table needle deflection angular dimension and loudspeaker sound size, at voltage table, add two potentiometers (10) in the loudspeaker loop.Whole teaching electromagnetic wave transmitting-receiving apparatus for demonstrating.
Claims (4)
1, a kind of new teaching electromagnetic wave transmitting-receiving apparatus for demonstrating, launch by electromagnetic wave, receive, effect shows three parts composition, the electromagnetic wave radiating portion has primary coil [A], dipole antenna [B], modulator [C], part such as secondary coil [D] is formed, modulator [C] is by switch [1], switch [2], normally opened contact [3], relay [4], electric capacity compositions such as [5], receiving unit adopts common FMAM receiving lines [6], the effect display part is by rectifier [7], voltage table [8], loudspeaker [9], potentiometer compositions such as [10], it is characterized in that this device electromagnetic wave radiating portion is provided with dipole antenna [B] and modulator [C], strengthened the emittance of electromagnetic wave outside circle, improved the demonstration effect, receiving unit adopts the FMAM circuit, can receive spark discharge, the radio station, TV station and wireless microphone signal, the display part is provided with voltage table [8] and loudspeaker [9], can utilize the sound size of variation of voltage table pointer and loudspeaker, show the demonstration effect.
2, teaching electromagnetic wave apparatus for demonstrating according to claim 1, it is characterized in that electromagnetic wave emission, reception, effect are shown three part organic assembling, the demonstration distance is brought up to about 40 meters for 1～2 meter by former Hertzian oscillator, and can make display effect directly perceived, and vivid visibility is big, understandable.
3, according to claim 1,2 described electromagnetic wave transmitting-receiving apparatus for demonstrating, it is characterized in that radiating portion is provided with modulator (C), can reach demonstration electromagnetic wave damping and undamped, electric capacity and period-luminosity relation experiment.
4,, it is characterized in that electric capacity (5) can improve frequency, the enhance antenna directionality experiment effect in the modulator (C) by being provided with according to the described teaching electromagnetic wave of claim 3 apparatus for demonstrating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90213837 CN2069151U (en) | 1990-05-22 | 1990-05-22 | Electromagnetic wave transmit-receive demonstrating device for teaching |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90213837 CN2069151U (en) | 1990-05-22 | 1990-05-22 | Electromagnetic wave transmit-receive demonstrating device for teaching |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2069151U true CN2069151U (en) | 1991-01-09 |
Family
ID=4893275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90213837 Withdrawn CN2069151U (en) | 1990-05-22 | 1990-05-22 | Electromagnetic wave transmit-receive demonstrating device for teaching |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2069151U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104064084A (en) * | 2014-06-25 | 2014-09-24 | 南宁市第二中学 | Electromagnetic wave demonstration teaching aid |
| CN104751718A (en) * | 2015-04-03 | 2015-07-01 | 林勇 | Electromagnetic wave sending and receiving demonstration instrument |
| CN104751723A (en) * | 2015-04-03 | 2015-07-01 | 林勇 | Demonstration instrument for interference, diffraction and polarization of electromagnetic waves |
-
1990
- 1990-05-22 CN CN 90213837 patent/CN2069151U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104064084A (en) * | 2014-06-25 | 2014-09-24 | 南宁市第二中学 | Electromagnetic wave demonstration teaching aid |
| CN104751718A (en) * | 2015-04-03 | 2015-07-01 | 林勇 | Electromagnetic wave sending and receiving demonstration instrument |
| CN104751723A (en) * | 2015-04-03 | 2015-07-01 | 林勇 | Demonstration instrument for interference, diffraction and polarization of electromagnetic waves |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Designer after: Zhao Decai Designer after: Zhao Long Designer after: Zhao Feng Designer before: Zhao Decai |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: DESIGNER; FROM: ZHAO DECAI TO: ZHAO DECAI; ZHAO LONG; ZHAO FENG |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |