54results about How to "Rich experimental content" patented technology

The invention relates to a wireless sensor network experiment platform based on a mobile sensor node, and designs and realizes a mobile wireless sensor network experiment platform which is rich in teaching contents, has opened experiment environment and is convenient for learning and researching a mobile wireless sensor network. An experiment device comprises a mobile sensor node based on an intelligent trolley, a static wireless sensor node, a sink node and a personnel computer system. The mobile sensor node comprises a master control subsystem, a sensor subsystem, an execution subsystem and a communication subsystem, wherein the master control subsystem comprises a microprocessor, a storage, an I/O drive circuit, a power supply circuit and the like; the sensor subsystem plays a role of acquiring and processing environment data and transmitting the processed data to the master control subsystem; the execution subsystem completes the action under the driving of a mechanical drive structure through a direct current motor; and the communication subsystem realizes wireless communication among the mobile sensor node, the static sensor node and the sink node.

This invention relates to a Doppler effect integrated experimental device including a host, a signal generation controller and a signal collecting and processing part, in which, the host is composed of a speed controller, an orbit, a step motor, a belt wheel, a dolly, a photoelectric gate, a sound source head, a signal receiver and a base, the sound source head or the receiver can be fixed on one end of the base, three photoelectric gates are installed on the side, the one at the middle is used in testing speed, and the two at both sides control stopping the dolly, which is fixed at the belt and mounted with barn plates at the side mounted with the sound source head and the signal receiver, the step motor drives the belt wheel to rotate after being turned on, the rev of the motor is controlled by the button at one side of the base to realize adjusting the speed of the dolly continuously, the position of the photoelectric gate testing the speed can be moved or altered, and the dolly can stop automatically by the gates at both sides of the orbit, the positions of the head and the receiver can be exchanged according to the experimental content.

An experimental device and method for measuring Young's modulus by the beam bending method based on the resonance principle relates to a Young's modulus measuring device and method. Difficult question. The device of the present invention includes two columns on the base, the two ends of the metal beam with rectangular cross-section are freely straddled on the knife edge of the upper end of the column, a copper frame is placed on the metal beam, and a vibration exciter and a movable armature are arranged at the lower end. Connected with the signal source, the measuring device is composed of a differential bridge composed of two inductance coils and two resistors, an AC voltage source, an amplifying device and an oscilloscope; the method of the present invention converts a sinusoidal signal into a mechanical vibration by using an exciter to make the metal The beam spring vibrator is forced to vibrate, and the electric bridge composed of variable inductance is converted into an electrical signal, and the frequency of the signal is adjusted. When the waveform amplitude is maximum, the natural frequency of the metal beam spring vibrator is obtained, and the Young's modulus is calculated. The invention is applicable to the measurement of Young's modulus.

Provided is a rotary diving platform experimental device capable of automatically recording and with variable speeds. The bottom end of a main rotary shaft is arranged in a funnel and connected with a driving device, and the driving device is connected with a controller; a ball crown-shaped diving platform which is used for the grip of a mouse is fixed on the top end of the main rotary shaft, the main rotary shaft is provided with a speed measuring device for measuring the speed of the main rotary shaft, and the speed measuring device comprises a speed measuring turntable fixedly arranged on the main rotary shaft coaxially and a Hall sensor fixedly arranged on one side of the main rotary shaft; a speed measuring magnetic block is fixed on the speed measuring turntable, and the Hall sensor and the speed measuring magnetic block are opposite to each other and matched with each other; the distance between the Hall sensor and the main rotary shaft is equal to that between the speed measuring magnetic block and the main rotary shaft, and the Hall sensor is connected with the controller; a monitoring device is arranged at the small opening of the funnel and used for detecting whether or not the mouse falls down, and the monitoring device comprises a plurality of pairs of infrared radiation sensors arranged on the inner wall of the funnel; each pair of the infrared radiation sensors are connected with the controller, and a timer is arranged inside the controller.

The invention discloses an experiment device and method for measuring metal wire Young modulus based on simple harmonic vibration, relates to a Young modulus measuring device and method, and aims to solve the problems that in the conventional university physical experiments, the experiment principle for measuring metal wire Young modulus is single and abstract, and the telescope is hard to adjust. The experiment device comprises a crossbeam, which is arranged on the upper end of a support; a platform is arranged on the middle of the support; an upper clamping head and a force sensitive sensor are arranged on the middle of the crossbeam; two ends of a metal wire are respectively connected to the force sensitive sensor and a lower clamping head, and the lower clamping head is connected to an iron block. A scale is arranged on a scale base, a laser device and a photoelectrical sensor that is connected to an intelligent photoelectrical timer are arranged on the scale. According to the method, the period of simple harmonic vibration of optical spot that is formed on the scale and is generated by reflecting laser beams emitted by the laser device by a plane mirror of an optical lever is measured so as to obtain the period (T) of simple harmonic vibration of a metal wire spring vibrator, and the period (T) is substituted into a formula to calculate the metal wire Young modulus. The provided device and method are suitable for measuring metal wire Young modulus.

The invention provides an auxiliary experiment device for measuring the radius of the curvature of a lens through a Newton ring. According to the device, eight LED monochromatic light sources with different wave lengths are adopted, light emitted by the light sources is coupled into a light guide fiber, and an outlet is provided with a beam expanding lens and frosted glass. A CCD camera is arranged in front of an eye lens of a reading microscope, the CCD camera is connected with a displayer through an interface, and the Newton ring can be directly displayed on the displayer. The LED monochromatic light sources with different wave lengths are turned on and used as incident light sources of an experiment, a Newton ring device is lightened after the light is reflected by a semi-reflective mirror, the Newton ring is displayed on the displayer through the CCD camera, and measurement can be conducted by using the reading microscope. According to the auxiliary experiment device, LEDs are used as the monochromatic light sources, the service life is long, preheating is not needed when experiments are conducted, lightness adjustment is convenient, eight monochromatic lights with different wave lengths can be obtained, the experiments are rich in content, student data are not prone to being similar, the Newton ring is directly displayed on the displayer through the CCD camera to be observed and measured, convenience is brought, and effort is saved.

The invention discloses a gas specific heat ratio measuring method and a system thereof. The system comprises a gas specific heat ratio measuring device, a controller, as well as temperature and humidity sensors of which the output ends are respectively connected with an input end of a measuring module of the controller. The method comprises the steps: (1) before the gas specific heat ratio is measured, obtaining a gas volume value by measuring and writing into a data recording module of the controller; (2) writing measuring data into a data measuring module of the controller, wherein the input end of the measuring module is connected with an atmosphere intensity of pressure sensor, the humidity and temperature sensor, a photogate, a pressure difference sensor; (3) processing the data by an operation module; (4) outputting a result. Measuring on intensity of pressure and volume can be realized at the same time while a measuring error of an instant intensity of pressure is small, influence of a temperature and humidity environment in an experiment can be corrected and an experiment measuring precision is high.

The invention provides an experiment device and method for measuring Young modulus by a beam bending method via resonance principle, and relates to a Young modulus measuring device and method. The device and the method solve the problems that in the prior art, when the beam bending method is used for measuring the Young modulus, the experiment principle is simple and abstract, and the regulation difficulty of a telescope is high. The experiment device comprises two upright posts arranged on a base, wherein two ends of a rectangular cross section metal beam freely step across cutter openings formed in the upper ends of the upright posts; a copper framework sleeves the metal beam; a vibration exciter and a metal framework are arranged at the lower end; the vibration exciter is connected with a signal source; a measuring device consists of an oscilloscope, an amplifying device, an alternating voltage source and a differential electric bridge formed by four magnetosensitive resistors. The method has the advantages that the vibration exciter is used for converting a sinusoidal signal into mechanical vibration, so that a metal beam spring oscillator does forced vibration; the vibration is converted into an electric signal by the electric bridge formed by the magnetosensitive resistors; the signal frequency is regulated; when the waveform amplitude is the maximum, the inherent frequency of the metal beam spring oscillator is obtained; the Young modulus is calculated out. The device and the method are applicable to Young modulus measurement.

The invention relates to an experiment device and method adopting a resonance principle to measure the Young modulus of a metal wire, relates to a Young modulus measuring device and method, and aims to solve the problems that in the conventional university physical experiments, the experiment principle for measuring metal wire Young modulus is single and abstract, and the telescope is hard to adjust. The device comprises a crossbeam, which is arranged on the upper end of a support. An upper clamping head and a vibration generator are arranged on the middle of the crossbeam. Two ends of a metal wire are respectively connected to the vibration generator and a metal frame. The vibration generator is connected to a signal source. A measuring device is composed of a differential bridge composed of four magnetic sensitive resistors, an alternating voltage source, an amplification device, and an oscilloscope. According to the method, the sinusoidal signals are converted into mechanical vibration by the vibration generator so as to force a metal wire spring oscillator to vibrate. The differential bridge composed of magnetic sensitive resistors is converted into electric signals. The signal frequency is adjusted. When the waveform amplitude is the largest, the inherent frequency of the metal wire spring oscillator is obtained. Then the inherent frequency is substituted into a formula to calculate the Young modulus of the metal wire. The provided method is suitable for measuring the Young modulus of a metal wire.

The invention discloses a rigid body rotational inertia tester which comprises a horizontally arranged base plate, a three-line pendulum device arranged on the right side of the base plate and a measurement and control system arranged on the left side of the base plate, and the three-line pendulum device comprises a support rod, an upper cross beam plate, three cycloids, a line length measurementand control device, a lower swing disc, a movable test platform and a test platform lifting mechanism. A photoelectric sensor and an angle positioner are arranged on the movable test platform, and themeasurement and control system is connected with the wire length measurement and control device, the test platform lifting mechanism and the photoelectric sensor. The cycloid length of the three-linependulum device can be set and adjusted according to requirements, the expansibility is high, and the experiment efficiency is greatly improved through motor control; experiment efficiency is increased greatly; in addition, the angle positioner can control the swinging angle of the lower swing disc to be smaller than 6 degrees, a circular mirror surface is installed in the center of the upper surface of the tray, nine equidistant concentric circles are marked on the surface of the lower swing disc, so that it is guaranteed that the center of the lower swing disc coincides with the center of ameasured rigid body rotating shaft, and experimental data are more accurate.

The invention discloses an experimental device for the computer hardware series course. The device comprises a downloading circuit, an experimental core module, an expansion module, a memory and a communication interface circuit, wherein the downloading circuit is used for downloading the hardware codes and experimental test programs for the experiment; the experimental core module and the expansion module are used for configuring logic functions according to the hardware codes to execute the experimental test programs; the memory is connected with the experimental core module through a data bus, an address bus and a read/write control line and used for storing the experimental test programs, the hardware codes and data; the communication interface circuit is used for communicating with the outside; the experimental core module is an FPGA (field programmable gate array); and the expansion module is a CPLD (complex programmable logic device). The experimental device disclosed by the invention can be flexibly configured according to the content of experiment, thus the content of experiment is rich that the component experiment as well as the systemic experiment about the computer hardware series composition can be realized.

The experimental device and method for measuring Young's modulus by the beam bending method based on the principle of resonance relates to a Young's modulus measuring device and method. Problems that are difficult to adjust. The device of the present invention includes setting two columns on the base, the two ends of the metal beam with rectangular cross-section are freely straddled on the knife edge of the upper end of the column, a copper frame is placed on the metal beam, and the vibration exciter and the metal plate for fixing the iron block are arranged at the lower end. The framework, the exciter is connected with the signal source, and the measuring device is composed of a Hall element, a measurement controller, a voltage amplification device and an oscilloscope; the method of the present invention uses the exciter to convert the sinusoidal signal into mechanical vibration, so that the metal beam spring vibrator is subjected to The forced vibration is converted into an electrical signal by the Hall element, and the frequency of the signal is adjusted. When the waveform amplitude is the largest, the natural frequency of the metal beam spring vibrator is obtained, and the Young's modulus is calculated by substituting it into the formula. The invention is applicable to the measurement of Young's modulus.

The invention discloses an experiment device and method for measuring the Young modulus of a metal wire according to simple harmonic vibration, relates to a Young modulus measuring device and method, and aims to solve the problems that in the conventional university physical experiments, the experiment principle for measuring metal wire Young modulus is single and abstract, and the telescope is hard to adjust. The device comprises a crossbeam, which is arranged on the upper end of a support. An upper clamping head and a force sensitive sensor are arranged on the middle of the crossbeam. Two ends of a metal wire are respectively connected to the force sensitive sensor and a lower clamping head. The lower clamping head and a metal frame are fixed together, and an iron block is fixed in the metal frame. An electromagnet device is arranged under the metal frame. A measuring device is composed of a Hall element, a measurement controller, a Hall voltage amplifying device, and a digital oscilloscope. The period of Hall voltage waveform with periodic changes is measured by the digital oscilloscope to obtain the period of a metal wire spring oscillator that performs simple harmonic vibration, and finally the period of metal wire spring oscillator is substituted into a formula to calculate the Young modulus of the metal wire. The provided method is suitable for measuring the Young modulus of a metal wire.

The invention discloses an experiment device and method utilizing simple resonance vibration to measure the Young modulus of a metal wire, relates to a Young modulus measuring device and method, and aims to solve the problems that in the conventional university physical experiments, the experiment principle for measuring metal wire Young modulus is single and abstract, and the telescope is hard to adjust. One end of an experiment table is provided with a vertical support, the other end is provided with an inclined support; a clamping head is arranged on the vertical support, one end of a metal wire is connected to the clamping head, the other end strides over a pulley and is connected to an iron block; an electromagnet device is arranged under the iron block; a positioning identification point is arranged on the metal wire; a scale microscope is arranged on the experiment table; and a CCD sensor is arranged in front of the eyepiece. According to the method, through a display, a second chronograph is used to measure the period of the positioning identification point that performs simple resonance vibration, namely the period of metal wire spring oscillator that carries out simple resonance vibration, and finally the period is substituted into a formula to calculate the Young modulus of the metal wire. The provided method is suitable for measuring the Young modulus of a metal wire.