CN204462415U - A kind of device utilizing hydrostatic pressure to measure acceleration of gravity - Google Patents

Abstract

The utility model discloses a kind of device utilizing hydrostatic pressure to measure acceleration of gravity, comprise the equipment of a container, a pipe and a measurement gas pressure, liquid is accommodated in container, one end of pipe is closed, other end opening, wherein accommodate air, the opening of described pipe vertically inserts in the liquid held in described container down, makes the difference in height of liquid level in the liquid level in described container and described pipe be h; The equipment of described measurement gas pressure, for measuring the pressure p of the air in described pipe, thus, can calculate acceleration of gravity according to following formula: p-p ₀=ρ gh, wherein p ₀for atmospheric pressure, g is acceleration of gravity, and ρ is the density of liquid.The device of the measurement acceleration of gravity of this practical phenotype has that structure is simple, easy and simple to handle, measuring accuracy is high, measures the advantage that demonstration is vivid.

Description

A kind of device utilizing hydrostatic pressure to measure acceleration of gravity

Technical field

The utility model relates to acceleration of gravity field of measuring technique, is specifically related to a kind of device utilizing hydrostatic pressure to measure acceleration of gravity.

Background technology

Testing acceleration of gravity in prior art generally uses single pendulum to test, and device comprises fine rule, prill with holes, iron clamp, iron stand and stopwatch; Make a call to a knot larger than the hole on prill in one end of fine rule, fine rule is made a single pendulum through the hole on prill, this single pendulum is fixed on iron stand by iron clamp, iron stand is placed on a limit and makes iron clamp stretch out desktop, make single pendulum freely sagging; The diameter using vernier caliper measurement to go out bead is designated as d; Meter ruler measurement prill suspension point is used to be designated as 1 to the distance of bead upper end; Prill is offset 5 ~ 8 degree, its perpendicular bisector to freely swing in perpendicular, and use stopwatch record prill to complete the time T entirely vibrated for 30 ~ 50 times; Obtain prill and entirely vibrate t=T/c averaging time used at every turn; The wherein number of times of full vibration that does for prill in T time of c; According to formula g=4 π ²l/t ²try to achieve acceleration of gravity, wherein L=d/2+1.

When using device to test acceleration of gravity of the prior art, a people is needed to see the number of times that table one personal record single pendulum vibrates entirely, operation more complicated, and calculating the full vibration number of single pendulum and utilizing single pendulum timing easily to go wrong, often need repeatedly repetitive operation once to measure successfully, need to spend the long time when therefore using acceleration of gravity measurement mechanism of the prior art to measure acceleration of gravity.

Utility model content

(1) technical matters that will solve

To be solved in the utility model is the not good and longer shortcoming consuming time of the device complicated operation of existing measurement acceleration of gravity, degree of accuracy.

(2) technical scheme

Measurement acceleration of gravity device of the present utility model, by measuring hydrostatic pressure, changes into voltage signal by pressure transducer, is calculating accurately acceleration of gravity.

(3) beneficial effect

The device of measurement acceleration of gravity of the present utility model has that structure is simple, easy and simple to handle, measuring accuracy is high, measures the advantage that demonstration is vivid.

Accompanying drawing explanation

Fig. 1 is the structural representation of an embodiment of the device of measurement acceleration of gravity of the present utility model;

Fig. 2 is the structural representation of another embodiment of the device of measurement acceleration of gravity of the present utility model;

Fig. 3 is the data drawing list utilizing the device of measurement acceleration of gravity of the present utility model to record.

Embodiment

For solving the problems of the technologies described above, the utility model proposes a kind of device of measurement acceleration of gravity newly, it comprises a container, pipe, a pressure transducer and a heat capacity of air compare tester.Liquid is accommodated in described container.One end of described pipe is closed, and other end opening, wherein accommodates air.Further, the opening of described pipe vertically inserts in the liquid held in described container down.Described pressure transducer is fixed in the inside of one end closed of described pipe, this pressure transducer is connected than tester with described heat capacity of air by the blind end of connecting line through described pipe, the voltage that described heat capacity of air is transformed by the pressure that the air in described pipe measured by described pressure transducer than tester.

For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is described in further detail.

Fig. 1 is the structural representation of an embodiment of the device of measurement acceleration of gravity of the present utility model.In this embodiment, in a glass jar 1, hold a certain amount of water 6.The glass tube 2 that an one end is closed is inverted in water, in this glass tube 2, accommodates a certain amount of air.Due to the pressure of water, water can enter in glass tube, makes the liquid level in glass tube 2 remain on certain height.A pressure transducer 3 is fixed in the inside of one end closed of described glass tube 2.This pressure transducer 3 is for detecting the pressure of the air in this glass tube 2.Further, pressure transducer 3 is connected than tester 5 with the heat capacity of air being positioned at glass jar 1 outside by an electric connection line 4.Pressure in the glass tube recorded by pressure transducer 3 sends heat capacity of air to than tester 5 by electric signal.Heat capacity of air is used for than tester the reading signal from pressure transducer being converted to instrument.

As from the foregoing, heat capacity of air is used for measuring the voltage in glass tube corresponding to gas pressure intensity than tester 5 and pressure transducer 3.In this embodiment, described heat capacity of air adopts FD-NCD-II type and diffusion silicon pressure sensor than tester 5.

The formula provided than tester operation instruction by FD-NCD-II type heat capacity of air is as follows:

$p-p_0=\frac{U}{2000}\×{10}^5---\left(1\right)$

Wherein p (unit: Pa) is the atmospheric pressure in glass tube 2, and U (unit: mV) is surveyed magnitude of voltage (glass intraductal pressure transforms gained by pressure transducer) than tester by heat capacity of air.

According to pressure principle, if standard atmospheric pressure is p ₀(generally conventional value can be adopted, if in order to improve precision, actual value can be measured to obtain in advance by barograph etc.), be that (this difference in height also can insert the degree of depth h water to h by glass tube from liquid level in glass jar to the difference in height of the liquid level in glass tube ₂deduct the degree of depth h that water enters glass visitor ₁obtain), the density of water be ρ then according to pressure principle, can obtain

p-p ₀＝ρgh (2)

Acceleration of gravity can be calculated by formula (1) and formula (2)

$g=\frac{50U}{\mathrm{\ρh}}$

By changing the degree of depth in glass tube insertion water, can obtain the value of multiple U and h, the slope of U-h line is the value of acceleration of gravity.Fig. 3 shows the U-h line of this embodiment.

In the utility model, glass jar and glass tube also can adopt other materials, but are preferably transparent or semitransparent material, to clearly illustrate the height and position of liquid level.In addition, can rational height scale on glass jar and glass tube, to read liquid level easily.

In another embodiment of the present utility model, acceleration of gravity measurement mechanism also can comprise a height gauge 7, and as shown in Figure 3, it can be erected at equally in glass jar 1 and to be fixed, thus, the height of liquid level in glass jar and glass tube can clearly be read.This height gauge can be various known sizes, such as steel ruler, plastic ruler etc.

Heat capacity of air in described embodiment also can by the equipment replacement of other measurement gas pressure than tester 5 and pressure transducer 3.Further, the liquid water in described embodiment also can be replaced by other fluent meterials, but preferably nontoxic, volatility is little and variable density is little liquid.

Compared to the prior art of direct acceleration measurement, the measurement of acceleration of gravity, by pressure principle, is changed into the measurement of gas pressure intensity by the utility model, and this is conducive to the difficulty improving measurement mechanism framework, thus improves the precision measured.Meanwhile, measuring method of the present utility model is simple, effectively, can improve the effect measured.Meanwhile, measuring process of the present utility model is lively, vivid, can be applied to the experiment appliance in teaching, scientific research, improves vividness and the quality of instruction of teaching.

Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiment of the utility model; be not limited to the utility model; all within spirit of the present utility model and principle, any amendment made, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims (5)

1. utilize hydrostatic pressure to measure a device for acceleration of gravity, comprise a container and a pipe, it is characterized in that, also comprise the equipment of a measurement gas pressure, wherein

A kind of liquid is accommodated in described container;

One end of described pipe is closed, and other end opening, wherein accommodates air, and the opening of described pipe vertically inserts in the liquid held in described container down, makes the difference in height of liquid level in the liquid level in described container and described pipe be h;

The equipment of described measurement gas pressure is for measuring the pressure p of the air in described pipe;

The equipment of described measurement gas pressure comprises heat capacity of air than tester and pressure transducer;

Described pressure transducer is connected than tester with described heat capacity of air by the blind end of connecting line through described pipe;

Described pressure transducer is for detecting the pressure of the air in described pipe;

Described heat capacity of air is used for than tester the reading signal from pressure transducer being converted to instrument.

2. utilize hydrostatic pressure to measure the device of acceleration of gravity as claimed in claim 1, it is characterized in that, the material of described container and/or described pipe is transparent or semitransparent material.

3. utilize hydrostatic pressure to measure the device of acceleration of gravity as claimed in claim 1, it is characterized in that, described liquid is water.

4. utilize hydrostatic pressure to measure the device of acceleration of gravity as claimed in claim 1, it is characterized in that, rational height scale on described container and/or pipe.

5. utilize hydrostatic pressure to measure the device of acceleration of gravity as claimed in claim 1, it is characterized in that, also comprise a height gauge, it is erect in the above-described container and is fixed.