Physics demonstration experiment report of the university of mutual induction and communication
#Physics demonstration experiment report of Mutual-Sensing Communication University ##1. Experiment Purpose 1. Deep understanding of mutual induction and its principle in communication. 2. Master the method of signal transmission through mutual induction coil. 3. Observe and analyze the effects of various factors in the mutual induction phenomenon on the communication effect. ##2. Experiment Principle The phenomenon of mutual induction refers to the fact that when there is a magnetic couple between two coil, the change in current in one coil will induce an electromagnetic force in the other coil. In the demonstration of mutual sensing communication, an electrical signal (such as music) was sent out from the primary coil of the mutual sensing coil. The secondary coil of the mutual sensing coil, which was several meters away from the primary coil, could receive the signal, and then the music electrical signal was converted into music through an amplifier and a speaker, thus realizing wireless communication. The mutual induction EMF was directly proportional to the degree of magnetic couple between the coil, the number of turns of the coil, and the rate of change of the current. It was also related to the distance and relative position between the coil. ##3. Experiment Equipment HLVD-HH- II type two-coil mutual induction analyzer, power supply, ammeter, voltage meter, main coil, secondary coil, resistance connected to the secondary coil (used to simulate the load in the actual circuit), amplifier, loudspeaker, etc. ##4. Experiment Steps ###(1) Experimental Device Construction 1. According to the experimental requirements, connect the power supply, mutual induction coil (main coil and secondary coil), load (resistance, etc.), measuring instrument (ammeter and voltage meter), and mutual induction analyzer to form a complete experimental circuit. Make sure that the connection parts are in good contact and the circuit is connected correctly. 2. An amplifier and a loudspeaker were connected to the secondary coil to receive and convert the electrical signal induced by the secondary coil. ###(2) Signal Transmission and Receiving Test 1. Turn on the power supply and adjust the voltage and frequency of the power supply to the required value for the experiment. 2. A specific electrical signal (such as a music signal) was input into the primary coil, and the current change in the primary coil was observed through the mutual induction analyzer. 3. At the secondary coil end, the voltage meter and ammeter were used to measure the induced electromagnetic force and current. At the same time, the amplifier and speaker were used to observe whether a music signal similar to the primary coil input was received. Record the current voltage, current data, and the reception quality of the music signal (such as clarity, volume, etc.). ###(3) Change the parameters and repeat the experiment 1. Change the distance between the primary coil and the secondary coil, repeat the above steps, and record the experimental data and signal reception at different distances. 2. Change the magnitude or frequency of the current in the primary coil, conduct the experiment again, and record the relevant data. 3. Change the number of turns of the coil (you can change the coil with different turns for the experiment), repeat the experiment and record the results. ##5. Record and Analysis of Experimental Data ###(1) Data Record Form | Experiment No.| coil spacing| primary current| Primary current frequency| turns per coil| secondary induced voltage| secondary induced current| signal received quality| |---|---|---|---|---|---|---|---| | 1 |[Distance 1]|[I1 value]|[f1]|[N1]|[U1]|[I2]|[Description 1]| | 2 |[Distance 2]|[I2]|[f2]|[N1]|[U2]|[I3]|[Description 2]| | 3 |[Distance 1]|[I3]|[F3]|[N2]|[U3]|[I4]|[Description 3]| ###(2) Data Analysis 1. According to the law of mutual induction, the influence of the primary coil current, frequency, coil turns and coil distance on the secondary coil induced voltage and current was analyzed. For example, as the primary coil current increases, whether the secondary coil induced voltage and current increase correspondingly; as the coil spacing increases, whether the induced voltage and current decrease, etc. 2. The relationship between the signal reception quality and the above physical quantities was discussed. For example, when the induced voltage and current were within a certain range, the signal reception quality was better, and beyond that range, the quality would decline. ##6. Experiment Results 1. The process of wireless communication through mutual induction was successfully demonstrated, and the application of the law of mutual induction in mutual induction communication was verified. 2. The influence of coil spacing, primary coil current and frequency, coil turns and other factors on the mutual induction communication effect (including the induction of the secondary coil and the quality of signal reception) was clarified. ##7. Sources of errors and measures to reduce them ###(1) Source of error 1. The precision of the experimental instrument itself, such as the measurement error of the ammeter and the voltage meter. 2. The external magnetic field interference might affect the magnetic couple between the mutual induction coil, thus affecting the experimental results. 3. There may be contact resistance at the coil connection, resulting in deviation between the actual current and voltage and the theoretical value. ###(2) Reduction measures 1. Calibrate the instrument before the experiment to improve the accuracy of the measurement. 2. Try to choose an experimental environment with less magnetic field interference, or shield the experimental equipment to reduce the influence of external magnetic fields. 3. Make sure the coil connection is firm and reduce contact resistance. ##8. Experiment conclusion and significance 1. ** conclusion ** - The mutual sensing phenomenon can be effectively used to achieve simple wireless communication. - The effect of mutual sensing communication is affected by many factors. In practical applications, these factors need to be taken into account to maximize the communication effect. 2. ** Meaning ** - It deepened the understanding of mutual induction and laid the foundation for further study of electromagnetics. - It showed the application of physical phenomena in practical communication, which helped to increase interest and enthusiasm in physics. Read more exciting novels for free
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