A Gravitational Acceleration Measuring Instrument Based on Free Fall Method

Abstract

The invention discloses a gravity acceleration measurement instrument based on a free falling body method, which comprises an experiment pipe column, a first permanent magnet, a second permanent magnet, a first magnetic sensor, a second magnetic sensor and a processing module, wherein the experiment pipe column is vertically placed; the first permanent magnet and the second permanent magnet are arranged at different heights of the experiment pipe column and separated by a preset distance; the first magnetic sensor is arranged between the first permanent magnet and the pipe wall of the experiment pipe column; the second magnetic sensor is arranged between the second permanent magnet and the pipe wall of the experiment pipe column; the first magnetic sensor and the second magnetic sensor generate sensing signals when a metal detected object respectively falls to the corresponding heights; the processing module is respectively connected with the first magnetic sensor and the second magnetic sensor and is used for carrying out processing on the sensing signals generated by the first magnetic sensor and the second magnetic sensor, respectively obtaining corresponding falling edge trigger pulse signals and acquiring falling time of the metal detected object within the preset distance according to the falling edge trigger pulse signals corresponding to the first magnetic sensor and the second magnetic sensor so as to calculate a gravity acceleration according to the preset distance and the falling time.

Description

technical field [0001] The invention relates to the technical field of experimental instruments, in particular to a gravitational acceleration measuring instrument based on a free fall method. Background technique [0002] The experiment of measuring the acceleration of gravity by the free fall method is currently one of the basic experiments of undergraduate physics subjects, and has become an indispensable part of the current university physics experiments. It detects the magnitude of the free-fall gravitational acceleration g through the free-fall method of the object, and currently occupies an important position in the teaching and scientific research of university physics. [0003] Since the calculation of the acceleration of gravity g needs to measure the vertical distance of the object falling for a distance of s and the time interval t for the object to pass through this distance, the experimenter can obtain the magnitude of the acceleration of gravity g when the obj...

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Problems solved by technology

However, in the experiment, it first takes a lot of time to adjust the position of the falling path of the steel ball, so that the vertical lower point of the steel ball corresponds to the light path emitted and received by the photoelectric gate, so that the steel ball falls through the light path of the photoelectric gate and reaches the photoelectric gate. The triggering of the gate, and then achieve the purpose of separately triggering the start and stop timing, but this requires a lot of experimental preparation work

At the same time, the falling trajectory of the steel ball often deviates from the light path emitted and received by the photogate during the falling process, which leads to the fact that the steel ball cannot be detected during the falling process, resulting in the lack of time t experimental data in the free fall experiment, which leads to the failure of the experiment

Therefore, the current experimental device requires a lot of time to adjust the experiment before the experiment. During the experiment, the falling steel ball is often missed by the photoelectric gate, resulting in timing failure. The current experimental device has too long preparation time for the experiment and low success rate of the experiment. shortcoming

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