Summary of the invention
The objective of the invention is to design a kind of Doppler's principle that utilizes and carry out the acoustic velocity measutement device.
For achieving the above object, the invention provides a kind of acoustic speedometer, comprise sound wave entrance port, LCD display, sound wave original frequency display screen, pickup wire speed display screen, sonic transmissions speed display screen, power light, linear velocity adjustment knob, power switch, supply socket, infrared receiving tube A, infrared receiving tube B, electrical axis, rotating disk, sensor, infrared transmitting tube, rotating disk circuit, metering circuit, shell.
Described sound wave entrance port is positioned at instrument backboard top;
Described LCD display is positioned at the panel of instrument;
Described power light, linear velocity are adjusted knob and are positioned at panel LCD display below;
Described power switch, supply socket are positioned at power light, the linear velocity of instrument panel and adjust the knob below;
Described rotating disk is positioned at the side of shell;
Described electrical axis passes center of turntable, the driven by motor dial rotation;
Described infrared receiving tube A, infrared receiving tube B are fixed on the tool housing;
Described sensor, infrared transmitting tube are fixed on the rotating disk;
Described rotating disk circuit is positioned at rotating disk;
Described LCD display comprises sound wave original frequency display screen, pickup wire speed display screen, sonic transmissions speed display screen, from top to bottom is positioned on the panel.
Learn that according to Doppler effect when (dorsad) radar station is pointed in the motion of object, the echo carrier frequency that radar receives will be higher than the carrier frequency of (being lower than) transmitted wave.Frequency variation is proportional to the speed component of object radial motion.If a sound wave enters the sound wave entrance port, when rotating disk is static, sensor records a frequency of sound wave F1, when rotating disk is rotated counterclockwise, the frequency of sound wave that sensor records is F2, this moment, the rotational line speed of rotating disk was S ', and the transmission speed S of sound wave can pass through formula F 1/F2=S/ (S+S ') calculating so.Sensor only is taken at the signal between infrared receiving tube A, the B, and measuring infrared transmitting tube can be by the time between the infrared receiving tube, calculate the linear velocity S ' of sensor.
Circuit is made up of rotating disk circuit and metering circuit, and its turntable circuit is made up of acoustic signals receiver module, signal processing and amplifying module, sound wave modulation wireless transmitter module; Metering circuit is made up of wireless signal receiving demodulation module, amplification Shaping Module, infrared signal load module, single-chip microprocessor MCU, MD module, linear velocity adjusting module, LCD display module.
Described acoustic signals receiver module, sound wave modulation wireless transmitter module connect signal processing and amplifying module;
Described wireless signal receiving demodulation module connects amplifies Shaping Module, sound wave modulation wireless transmitter module;
Described single-chip microprocessor MCU connects infrared signal load module, MD module, linear velocity adjusting module, LCD display module, amplifies Shaping Module.
Circuit theory is that the sound wave entrance port in the rotating disk circuit receives acoustic signals, after the signal processing and amplifying, carry out sound wave modulation and the wireless metering circuit that is emitted to again, metering circuit receives and reconciles amplifies shaping behind the wireless signal and transfers to single-chip microprocessor MCU and carry out frequency of sound wave and detect, the infrared signal of the infrared transmitting tube of single-chip microprocessor MCU reception simultaneously emission is carried out the rotating disk linear velocity and is detected the line speed adjustment of going forward side by side, and the sound wave original frequency that single-chip microprocessor MCU draws processing, pickup wire speed, sonic transmissions speed are presented on the LCD display.
Acoustic speedometer of the present invention is simple in structure, acoustic velocity measutement accurate, it is simple and easy to be convenient to make, to operate, can be applicable to impart knowledge to students, the measurement of conventional field aeromerric moasurenont such as test, various air borne physical quantitys, if change the rotational speed (such as light velocity equivalence) of sensor kind or change rotating disk, then can allow people see electromagnetic wave.
Description of drawings
Fig. 1 is the rear perspective view of the embodiment of the invention.
Fig. 2 is the front perspective view of the embodiment of the invention.
Fig. 3 is an embodiment of the invention inner structure synoptic diagram.
Fig. 4 is an embodiment of the invention rotating disk circuit block diagram.
Fig. 5 is an embodiment of the invention metering circuit functional-block diagram.
Numeral explanation among the figure: 1, sound wave entrance port, 2, LCD display, 3, sound wave original frequency display screen, 4, pickup wire speed display screen, 5, sonic transmissions speed display screen, 6, power light, 7, linear velocity is adjusted knob, and 8, power switch, 9, supply socket, 10, infrared receiving tube A, 11, infrared receiving tube B, 12, electrical axis, 13, rotating disk, 14, sensor, 15, infrared transmitting tube, 16, rotating disk circuit, 17, metering circuit, 18, shell.
Embodiment
Fig. 1-3 is an embodiment of the invention structural representation, as shown in the figure, the sound wave entrance port can receive 1 and receive acoustic signals, LCD display 2 comprises sound wave original frequency display screen 3, pickup wire speed display screen 4, sonic transmissions speed display screen 5, can show the sound wave original frequency respectively, pickup wire speed, sonic transmissions speed, but power light 6 display power supply on off operating modes, linear velocity is adjusted knob 7 scalable rotating disk linear velocities, sensor 14 can record frequency of sound wave under the different linear velocity conditions of rotating disk 13, infrared receiving tube A10, infrared receiving tube B11 can receive infrared transmitting tube 15 can send infrared-ray, can be used for limiting sensor 14 and receive useful signal scope, rotating disk circuit 16, metering circuit 17 application drawings 4, principle shown in Fig. 5 carries out that acoustic signals is handled and with measured sound wave original frequency, pickup wire speed, sonic transmissions speed is presented on the LCD display 2.
Fig. 4-5 is the circuit block diagram of the embodiment of the invention.Circuit theory is that the sound wave entrance port in the rotating disk circuit 16 receives acoustic signals, after the signal processing and amplifying, carry out sound wave modulation and the wireless metering circuit 17 that is emitted to again, metering circuit 17 receives and reconciles amplifies shaping behind the wireless signal and transfers to single-chip microprocessor MCU and carry out frequency of sound wave and detect, the infrared signal of the infrared transmitting tube of single-chip microprocessor MCU reception simultaneously 15 emissions is carried out the rotating disk linear velocity and is detected the line speed adjustment of going forward side by side, and the sound wave original frequency that single-chip microprocessor MCU draws processing, pickup wire speed, sonic transmissions speed are presented on the LCD display 2.
The above for the person of ordinary skill of the art, can make other corresponding changes according to technical scheme of the present invention and technical conceive, and these change all should belong to claim protection domain of the present invention.