CN206558064U - One kind simulation long distance laser communication experimental teaching unit - Google Patents

Abstract

One kind simulation long distance laser communication experimental teaching unit, including bottom plate, loudspeaker box device, BUILDINGS MODELS, transmitting terminal Laser Modulation device, laser beam emitting device and receiving terminal laser demodulating equipment are provided with bottom plate, the loudspeaker box device is located at the side of BUILDINGS MODELS, the transmitting terminal Laser Modulation device is located at the opposite side of BUILDINGS MODELS, receiving terminal laser demodulating equipment is provided with the front end of loudspeaker box device, laser beam emitting device is provided with the front end of transmitting terminal Laser Modulation device, more than two guiding devices are provided with the front end of BUILDINGS MODELS.Audio signal is changed into laser signal by transmitting terminal Laser Modulation device, then sent by laser beam emitting device, laser signal after guiding device by receiving terminal laser demodulating equipment by being received, receiving terminal laser demodulating equipment demodulates laser signal, laser signal is converted to audio signal, played back again by loudspeaker box device, can realize that the effect of the long-distance transmissions of building is avoided in simulation by guiding device.

Description

One kind simulation long distance laser communication experimental teaching unit

Technical field

The utility model is related to a kind of simulation long distance laser communication experimental teaching unit.

Background technology

Because analogue audio frequency is present, transmission range is short, easily by extraneous electromagnetic interference the shortcomings of, in voice communication skill Begin to use Digital Audio Transmission mode in art, advantage is even more to exist to Laser Transmission so that its strong antijamming capability, signal bandwidth be big etc. Audio area is widely used.

The content of the invention

The technical problem that the utility model will connect solution is to provide and a kind of conveniently install, facilitates teachers ' teaching and student to operate Simulation long distance laser communication experimental teaching unit.

In order to solve the above-mentioned technical problem, the utility model includes bottom plate, provided with loudspeaker box device, building mould on bottom plate Type, transmitting terminal Laser Modulation device, laser beam emitting device and receiving terminal laser demodulating equipment, the loudspeaker box device are located at building mould The side of type, the transmitting terminal Laser Modulation device is located at the opposite side of BUILDINGS MODELS, in the front end of loudspeaker box device provided with reception Laser demodulating equipment is held, laser beam emitting device is provided with the front end of transmitting terminal Laser Modulation device, is set in the front end of BUILDINGS MODELS There are more than two guiding devices.Audio signal is changed into laser signal by transmitting terminal Laser Modulation device, then passed through Laser beam emitting device is sent, and laser signal after guiding device by receiving terminal laser demodulating equipment by being received, receiving terminal laser solution Device demodulation laser signal is adjusted, laser signal is converted to audio signal, then is played back by loudspeaker box device, passes through leaded light dress Putting can realize that the effect of the long-distance transmissions of building is avoided in simulation.While the mounting structure of each experiment module on bottom plate Layout is simple, facilitates user to dismount, and facilitates teachers ' teaching and student to operate.

As further improvement of the utility model, the laser beam emitting device includes laser beam emitting head and first and installed Seat, laser beam emitting head is located in the first mounting seat, and transmitting terminal Laser Modulation module, institute are provided with transmitting terminal Laser Modulation device Stating transmitting terminal Laser Modulation module includes triangular-wave generator, voltage comparator LM311 and clamp circuit, voltage comparator LM311 the 7th pin is connected with clamp circuit, laser beam emitting head respectively, and voltage comparator LM311 the 2nd pin and audio signal connect Connect, voltage comparator LM311 the 3rd pin is connected with triangular-wave generator.

As further improvement of the utility model, the receiving terminal laser demodulating equipment includes laser pickoff and integration Circuit, laser pickoff is connected by integrating circuit with loudspeaker box device.

As further improvement of the utility model, the guiding device includes the second mounting seat, in the second mounting seat Provided with guide-lighting glass plate.

In summary, the utility model has the advantages that conveniently installing, facilitating teachers ' teaching and student to operate.

Brief description of the drawings

Come that the utility model is described in more detail with reference to the accompanying drawings and detailed description.

Fig. 1 is schematic diagram of the present utility model.

Fig. 2 is the structural representation of transmitting terminal Laser Modulation module of the present utility model.

Fig. 3 is the structural representation of receiving terminal laser demodulation module of the present utility model.

Fig. 4 is signal waveform transition diagram of the present utility model.

Embodiment

As shown in Fig. 1 to Fig. 4, the utility model include bottom plate 1, on bottom plate 1 provided with loudspeaker box device 2, BUILDINGS MODELS 3, Transmitting terminal Laser Modulation device 4, laser beam emitting device 5 and receiving terminal laser demodulating equipment 6, the loudspeaker box device 2 are located at building The side of model 3, the transmitting terminal Laser Modulation device 4 is located at the opposite side of BUILDINGS MODELS 3, is set in the front end of loudspeaker box device 2 There is receiving terminal laser demodulating equipment 6, laser beam emitting device 5 is provided with the front end of transmitting terminal Laser Modulation device 4, in BUILDINGS MODELS 3 front end includes the second mounting seat provided with two guiding devices 7, the guiding device 7, provided with guide-lighting glass in the second mounting seat Glass plate.The laser beam emitting device 5 includes laser beam emitting head and the first mounting seat, and laser beam emitting head is located in the first mounting seat, Transmitting terminal Laser Modulation module is provided with transmitting terminal Laser Modulation device 4, the transmitting terminal Laser Modulation module 1 includes triangle Wave producer, voltage comparator LM311 and clamp circuit, the triangular-wave generator include 555 timers, electric capacity C1, resistance R1, resistance R2 and switching diode 1N914, the 1st pin ground connection of 555 timers, the 4th pin of 555 timers and the 8th pin connect electricity Source, the 2nd pin of 555 timers is connected with voltage comparator LM311 the 3rd pin and electric capacity C1 one end respectively, and electric capacity C1's is another One end is grounded, and the 6th pin of 555 timers is connected with switching diode 1N914 negative pole, and resistance R1 one end is fixed with 555 respectively When the 7th pin of device, resistance R2 one end, switching diode 1N914 positive pole connection, resistance R1 another termination power, resistance The R2 other end is connected with electric capacity C1, and voltage comparator LM311 the 7th pin is connected with clamp circuit, laser beam emitting head respectively, institute Clamp circuit is stated including resistance R3 and voltage-regulator diode D2, voltage comparator LM311 the 7th pin respectively with resistance R3, voltage stabilizing two Pole pipe D2 negative pole connection, voltage-regulator diode D2 plus earth, a resistance R3 termination power, voltage comparator LM311's 2nd pin is connected with audio signal, and voltage comparator LM311 the 1st pin and the 4th pin are grounded, voltage comparator LM311 the 8th pin Power supply is connect, the receiving terminal laser demodulation module 2 includes laser pickoff and integrating circuit, and laser pickoff includes the pole of photoelectricity two Pipe D1, the integrating circuit includes resistance R4 and electric capacity C2, the audio amplifier using RC series connection integrating circuit, RC series connection integrating circuit Device 2 includes amplifier chip LM386, adjustable resistance VR1, electric capacity C3, electric capacity C4, resistance R5 and loudspeaker, photodiode D1 positive pole is connected with resistance R4, adjustable resistance VR1 respectively, photodiode D1 negative pole ground connection, adjustable resistance VR1 moving plate End is connected with amplifier chip LM386 the 3rd pin and electric capacity C2 respectively, amplifier chip LM386 the 2nd pin, the 4th pin and the 7th Pin is grounded, and amplifier chip LM386 the 6th pin connects power supply, and amplifier chip LM386 passes through its 5th pin and electric capacity C3, electricity Resistance R5 is in series, and resistance R5 one end ground connection, amplifier chip LM386 is mutually gone here and there by its 5th pin with electric capacity C4, loudspeaker Connection, one end ground connection of loudspeaker.

Audio signal is changed into laser signal by transmitting terminal Laser Modulation device 4, then passes through laser beam emitting device 5 Send, laser signal after guiding device 7 by receiving terminal laser demodulating equipment 6 by being received, and receiving terminal laser demodulating equipment 6 is demodulated Laser signal, is converted to audio signal by laser signal, then is played back by loudspeaker box device 2, can be real by guiding device 7 Now the effect of the long-distance transmissions of building is avoided in simulation.The mounting structure layout letter of each experiment module on bottom plate 1 simultaneously It is single, facilitate user to dismount, facilitate teachers ' teaching and student to operate.The triangular wave that audio signal and triangular-wave generator are produced passes through Voltage comparator LM311 carries out analog signal conversion data signal PWM modulation, reference picture 4, obtained data signal PWM warps Cross clamp circuit high level is stable in 5V, high level can be used for the driving of laser beam emitting head.Laser is lighted during high level, low electricity Usually laser does not work.Thus audio-frequency information can be launched by laser beam emitting head.The sound frequency that human ear can be heard exists Between 20Hz--20kHz, so effective audio signal highest frequency 20kHz.On the other hand, applied voltage comparator LM311 During modulated signal, the triangular wave sample frequency of input must the integrality that just can guarantee that signal higher than audio signal highest frequency, To ensure sampling quality, sample frequency is generally greater than twice of original signal highest frequency.The photoelectricity of receiving terminal laser demodulating equipment 6 Diode D1 receives the laser signal that laser beam emitting head is launched, can be certain because photodiode D1 is only to red light sensitiveness Reduce influence of the light to signal quality in environment in degree.The signal that photodiode D1 is received and exported is still digital letter Number PWM, data signal PWM are analog signal by integrating circuit decodable code.Because data signal PWM duty cycle is higher, The analog signal voltage changed into is 3 to 4V.On the other hand, because data signal PWM frequency is higher, as far as possible without using many Level integrating circuit, can reduce delay, it is ensured that signals revivification quality.In summary, integrating circuit is from RC series connection integrating circuit, mould Intend signal to obtain from electric capacity two ends.Integrating circuit time constant：T=RC, source signal pulsewidth t1 should be met when realizing storage effect t>>t1.When resistance R1, R2 select 15 k Ω, resistance R3 is from 240 Ω, and resistance R4 selects 100k Ω, resistance R5 to select 10 Ω, Electric capacity C1 selects 0.001uf, electric capacity C2 to select 0.01uf, electric capacity C3 to select 0.05uf, electric capacity C4 to select 250uf, adjustable resistance VR1 can meet condition when selecting 10 k Ω, while electric capacity C2 can serve as filter capacitor, filter the ripplet produced during integration, So that the analog signal that integration is obtained is smooth, partial noise is eliminated.Obtain to be realized by the sounding of loudspeaker box device 2 after audio signal Transfer function of the laser to sound.Amplifier chip LM386 gain factors scope is 20 to 200 times, and experiment uses 3W loudspeakers, Frequency amplification effect is good.

Claims (4)

1. one kind simulation long distance laser communication experimental teaching unit, including bottom plate, provided with loudspeaker box device, building mould on bottom plate Type, transmitting terminal Laser Modulation device, laser beam emitting device and receiving terminal laser demodulating equipment, it is characterised in that：The audio amplifier dress The side of BUILDINGS MODELS is set in, the transmitting terminal Laser Modulation device is located at the opposite side of BUILDINGS MODELS, in loudspeaker box device Front end is provided with receiving terminal laser demodulating equipment, and laser beam emitting device is provided with the front end of transmitting terminal Laser Modulation device, in building The front end of model is provided with more than two guiding devices.

2. the simulation long distance laser communication experimental teaching unit as described in claim 1, it is characterised in that：The Laser emission Device includes laser beam emitting head and the first mounting seat, and laser beam emitting head is located in the first mounting seat, in transmitting terminal Laser Modulation dress Transmitting terminal Laser Modulation module is provided with putting, the transmitting terminal Laser Modulation module includes triangular-wave generator, voltage comparator LM311 and clamp circuit, voltage comparator LM311 the 7th pin are connected with clamp circuit, laser beam emitting head respectively, voltage ratio compared with Device LM311 the 2nd pin is connected with audio signal, and voltage comparator LM311 the 3rd pin is connected with triangular-wave generator.

3. the simulation long distance laser communication experimental teaching unit as described in claim 1, it is characterised in that：The receiving terminal swashs Optical demodulating apparatus includes laser pickoff and integrating circuit, and laser pickoff is connected by integrating circuit with loudspeaker box device.

4. the simulation long distance laser communication experimental teaching unit as described in claim 1, it is characterised in that：The guiding device Including the second mounting seat, provided with guide-lighting glass plate in the second mounting seat.