JPH0666617A - Volume measuring apparatus - Google Patents

Abstract

PURPOSE:To obtain a volume measuring apparatus which can measure the volume of an arbitrary object quite easily and which can also measure the measurement accuracy correctly. CONSTITUTION:An object 2 is inserted into a measuring chamber 1 and the volume thereof is measured. A pressure plate 3 partitioning between the inside and the outside is provided, while being supported by a bellows so that the pressure plate 3 can move freely in inward/outward direction, at a part of the measuring chamber 1 and driver for pressurization is carried on the pressure plate 3. The driver comprises a permanent magnet 5 constituting a part of a drive rod 4 secured to the pressure plate 3 and the permanent magnet 5 is driven through a field coil 6. Pressurizing power is measured by detecting the exciting current of the coil 6 through a meter 7. Furthermore, moving distance of the pressure plate 3 is measured through an optical position detector 8. Volume of the object 2 is then measured through processing on the pressurizing power and moving distance thus measured according to the law of gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object volume measuring device.

[0002]

2. Description of the Related Art The volume of an object is conventionally measured by measuring its external dimensions or by inserting the object into a liquid and measuring the amount of increase in the liquid, but the external shape of the object is complicated. Then, it is impossible to measure accurately, and it is impossible to measure with a substance that cannot be inserted into a liquid, and it was not possible to easily measure the volume by any method.

[0003]

DISCLOSURE OF THE INVENTION The present invention provides a volume measuring device capable of extremely easily measuring the volume of an arbitrary object and accurately measuring the accuracy.

[0004]

A pressure plate for partitioning the inside and the outside is movably provided in a part of a measurement chamber, and a drive device for driving the pressure plate and a position detector for measuring a moving distance of the pressure plate are provided. The volume of the object inserted into the measurement chamber is measured by the pressing force or suction force of the pressure plate by the driving device and the measurement distance of the position detector.

[0005]

According to the present invention, as described above, a pressure plate for partitioning the inside and the outside is movably provided in a part of the measurement chamber, and the pressure suction force and the movement distance when a pressure force or a suction force is applied to this pressure plate. Since the volume of the object inserted into the room is measured by the method, the volume can be measured very easily regardless of how complicated the shape of the object is, and the measurement accuracy can be measured very accurately.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment of the drawings. In FIG. 1, reference numeral 1 denotes a measuring chamber, into which an object 2 to be measured is inserted for volume measurement. A pressure plate 3 is provided in a part of the measurement chamber so as to partition the inside and the outside, and the periphery is supported by a bellows or the like so as to be movable inward and outward. Reference numeral 4 denotes a drive rod having one end fixed to the pressure plate 3, a part of which is provided with a permanent magnet 5 and a magnetic field coil 6 which is provided outside the permanent magnet 5. The excitation force of the pressure suction is applied to the pressure plate 3 by the excitation of the coil 6, and the force can be measured by the excitation current proportional to the meter 7. A position detector 8 measures the amount of movement by irradiating the head of the rod 4 with a laser beam.
A detector that measures the reflected light from the irradiation light using the principle of triangulation can be used, and the detection accuracy is 0.1 μm.
It is possible to detect about 0.01 μm. Reference numeral 9 is a measurement obtained by inputting a pressure or suction force signal acting on the pressure plate 3 detected by the meter 7 and a movement distance signal of the pressure plate 3 detected by the detector 8 and calculating by a required calculation formula. The output of the calculation circuit for calculating the volume is displayed on the display unit
In addition to display.

[0007] Now, in an empty state in which the object 2 is not inserted into the measurement chamber 1, the atmospheric pressure P ₀ where no pressure acts on the pressure plate 3
At this time, the interior volume is V ₀ . Then, when the coil 6 is excited and the pressure P ₁ is applied to the pressure plate 3, the pressure plate 3 is pushed into the room by the distance l ₁ . The moving distance l ₁ of the pressure plate 3 is measured by the detector 8. The detection signals P ₁ and l ₁
Is input to the arithmetic circuit 9 to calculate the interior volume V ₀ . In the arithmetic processing of the arithmetic circuit 9, since the pressure and the volume in the chamber change according to the law of gas, the following equation holds. However,
S is the area of the pressure plate 3.

[0008]

[Equation 1]

Rewriting Equation 1 above gives the following.

[0010]

[Equation 2]

In the above formula 2, P ₀ is the atmospheric pressure and S is the known value of the area of the pressure plate 3. Therefore, if these are input to the memory of the arithmetic circuit in advance, the detection signal P
_{1, l} indicator calculated easily _{V 0} by ₁ input 1
It can be displayed at 0.

Next, when the object 2 to be measured is inserted into the measuring chamber 1 and its volume is measured, the volume required by the object 2 is set to V _t , the pressure P ₂ is applied to the pressure plate 3, and the moving distance l ₂ If is detected, the following equation holds.

[0013]

[Equation 3]

Rewriting Equation 3 above gives the following.

[0015]

[Equation 4]

Since V ₀ has been obtained in the equation (4), the volume V _x can be easily measured by measuring P ₂ , l _2.
Can be measured.

For example, a cylindrical case having a diameter of 30 cmφ and a length of 10 cm and an internal volume of 7068 cm ³ is used in the measuring chamber,
The pressure plate for changing the internal volume is 5 inches (pressure area 12
2 cm ² ) is used, and when the pressure is applied to this for moving pressure of 5 mm (volume 61 cm ³ ), the pressure rises by 8 mb. Further, when a 1 cc object was put in the cylindrical case, a difference of about 0.1 mb could be detected.

As described above, the pressure difference when the moving distance of the pressure plate is constant may be measured, or the moving distance when the pressure is applied at a constant pressure may be measured. Also, suction pressure may be applied. Any other device can be used as the device for driving the pressure plate, the device for measuring the moving distance of the pressure plate, and the like.

Although the volume measurement of the object has been described above, the material determination of the metal, the noble metal, the ceramics, etc. is not limited to the measurement of the volume, but the comprehensive judgment with the measured values of the specific resistance, color, specific gravity and the like. You can

[0020]

As described above, according to the present invention, a pressure plate for partitioning the inside and the outside is movably provided in a part of the measurement chamber, and the pressure and suction force when the pressure or suction pressure is applied to the pressure plate is moved. One or both of distance and distance are detected, and the volume of the object inserted into the room is measured according to the law of gas from the above both signals, so no matter how complicated the shape of the measured object is, The volume can be easily measured, and the measurement accuracy can be extremely accurately measured.

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of the present invention.

[Explanation of symbols]

 1 Measuring Room 2 Object to be Measured 3 Pressurizing Plate 4 Driving Rod 5 Magnet 6 Magnetic Coil 7 Ammeter 8 Position Detector 9 Arithmetic Circuit 10 Display

Claims (2)

[Claims] 1. A pressure plate for partitioning the inside and the outside of the measurement chamber is movably provided, and a drive device for driving the pressure plate and a position detector for measuring the moving distance of the pressure plate are provided. The volume measuring apparatus is characterized in that the volume of an object inserted into the measuring chamber is measured by the pressurizing or suctioning force of the pressure plate and the measuring distance of the position detector. 2. A pressure plate for partitioning the inside and the outside is movably provided in a part of the measurement chamber, and a drive device for driving the pressure plate and a limiting device for setting a predetermined moving distance of the pressure plate are provided. A volume measuring device, characterized in that the volume of an object inserted into a measuring chamber is measured by the pressure or suction force of the pressure plate by the device and the set moving distance of the pressure plate.