JPS62123322A - Simultaneously measuring apparatus for changes in size and weight - Google Patents

Abstract

PURPOSE:To enable simultaneous measurement of changes in size and weight of a cement-based porous material, by combining a non-contact type displacement gauge and a loadcell type weight measuring device. CONSTITUTION:An object to be measured is a plate sample 1 of cement-based porous material and is topped with a metallic cap 2. An eddy current displacement sensor 3 is arranged slightly separated from the cap 2 and an electric signal from the sensor 3 is taken out via a cable 4. The eddy current generated between the sensor 3 and the cap 2 varies in the intensity with the size of the clearance. The changes in the size of the sample 1 can be measured by capturing the variation as displacement. A loadcell 5 is arranged below a holder 5a of the sample 1 to measure changes in the weight of the sample 1. An electric signal from the loadcell 5 is taken out via a cable 6. It should be noted that a displacement of the loadcell 5 itself if small for weight change, much smaller than variation in the size of the sample 1. Thus, the displacement of the loadcell 5 itself can be ignored, in no way affecting the measurement of changes in the size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] This invention belongs to the field of measurement technology. In particular, it belongs to the field of technology for measuring changes in dimensions and weight of objects.

[Background Art] Measuring the weight and dimensions of an object is a basic measurement at the industrial level such as when manufacturing and assembling the object, at the laboratory level such as testing and research, and at the commercial stage such as buying and selling products. It is one of the

Dimension measurements can be performed by shining a measuring tape, caliper, dial gauge, etc. directly onto the object to be measured, or by contact methods, which use capacitance or magnetism to measure by touching the measuring part.
There are optical types, non-contact types that use laser light, ultrasonic waves, and eddy currents. The measurement accuracy is also 0.1m11
It varies from ~0.1 μm. These methods are selected and used depending on the purpose of measurement and required accuracy.

On the other hand, for weight measurement, a load cell using a strain gauge,
A pressure sensor, a balance using balance, etc. are used, and the accuracy is several logs 0.01 mg.

When an object is placed under certain conditions (temperature, humidity, atmosphere of carbon dioxide, etc.), chemical changes occur due to changes in tissue structure, moisture absorption, water absorption, moisture release, water release, and the incorporation of gas into the system. As a result, dimensions and weight often change simultaneously.

This tendency is particularly noticeable in plate-shaped materials such as cement-based porous materials.

In order to investigate changes in the physical properties of objects and their causes, it is often necessary to simultaneously measure dimensions and weight and understand the relationship between dimensional changes and weight.

However, conventionally, no measuring device has been provided that satisfies the above requirements.

[Object of the Invention] An object of the present invention is to provide an apparatus that can simultaneously measure changes in dimensions and weight.

[Disclosure of the Invention] The present invention is a device for simultaneously measuring dimensional changes and weight changes of an object, in which a non-contact displacement meter is used to measure dimensional changes, and a weight measuring device uses an error in the displacement measurement. The present invention provides a device for simultaneously measuring changes in dimensions and weight, characterized in that it uses a measuring instrument capable of measuring changes in weight within a limit of displacement of a sample that does not occur.

When it is necessary to simultaneously measure changes in dimensions and weight, there are restrictions on the measuring instruments that can be used depending on the test or measurement conditions. However, it is basically possible to measure dimensions using a non-contact method, and measure weight by combining a load cell method such as a load converter. This invention provides a suitable device for simultaneously measuring changes in dimensions and weight of a cement-based porous material whose dimensions tend to change due to the action of water (humidity); however, it is intended to limit its use. isn't it.

However, in the following, a case will be explained in which a plate-shaped sample of a cement-based porous material is measured. Note that cases in which other objects are measured or the test conditions are changed will be explained each time.

Example 1 FIG. 1 is a schematic diagram of a helicopter fixing device according to an embodiment of the present invention, in which 1 is a plate-shaped sample of a cement-based porous material to be measured, 2 is a metal cap, and 3 is a vortex. It is a current displacement sensor, and is placed a little apart from the metal cap 2. 4 is a signal cable, which is a cable for taking out an electric signal from the eddy current displacement sensor 3. 5 is a load cell that measures changes in the weight of the sample. In this embodiment, the load cell 5 is placed under the holder 5a of the sample 1. When measuring weight changes using the load cell 5, the displacement of the load cell 5 itself is small relative to the weight change, and is sufficiently small compared to the amount of displacement (dimensional change) of the object to be measured, so the displacement of the load cell itself can be ignored. , does not affect the measurement of dimensional changes. 6 is a signal cable for taking out electrical signals from the load cell 5. 8
is the floor of the outer enclosure of the measuring instrument, and 7 indicates the ceiling.

It is more convenient to construct a constant temperature and humidity chamber using the outer shell of the measuring instrument.

Although not intended to be limiting, it is most convenient to measure dimensional changes using the eddy current displacement sensor 3.
In this case, since the cement material is not metal, a metal camp 2 is placed over it for measurement. This cap 2
The eddy current generated between the displacement sensor 3 and the displacement sensor 3 can be strong or weak depending on the size of the gap. The strength and weakness are understood as displacement. If the object to be measured is metal, the cap 2 is not necessary because an eddy current is generated between the object to be measured and the sensor.

The reason for adopting this eddy current type displacement sensor 3 is (1) It is inexpensive.

■ It is a non-contact type and does not affect weight measurement.

■ Small in size and can be incorporated into equipment.

■ Not easily affected by moisture and humidity.

This is because.

In this embodiment, the load cell 5 is placed in a tank of the measuring instrument, so it is not suitable for measurement under humid conditions or where the load cell 5 is exposed to water.

Example 2 FIG. 2 shows that the load cell 5 for measuring weight changes is
An example is shown in which it is placed outside the contour of the measuring instrument. The eddy current displacement sensor 3 for dimension measurement is the same as in the first embodiment. However, it is fixed to a support plate 14 that does not bend and extends from a column 12 that stands independently. This is a sample 1 with a load cell 5 for weight measurement installed above and a cap 2 fitted.
This is because it was made to hang. In other words, sample 1 is
It is mounted and fixed on a sample mounting table 11 and connected to a load cell 5 by a wire 10 and a hanger 9, thereby making it independent from the displacement sensor 3.

In the case of this embodiment, the load cell 5 can be taken out of the constant temperature constant chamber, so it is convenient for measurements in water or under high temperature and high humidity conditions.

The basic point of the present invention shown in Example 1.2 is that in order to provide a device that can measure dimensions and weight simultaneously, dimensions can be measured using a non-contact method, and weight can be measured using a load cell, etc., which is sensitive to dimensional changes. The point is to use a method that does not interfere with measurement.

What kind of non-contact measuring equipment to use? The type of instrument to be used for measurement should be changed depending on the temperature and humidity conditions, the shape of the object to be measured, etc.
It should not be particularly limited. However, it is best to use a type similar to the embodiment described above.

[Effects of the Invention] This invention is characterized in that it combines a displacement meter and an IT quantity measuring device, so that dimensions and weight can be measured at the same time.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a measuring instrument according to one embodiment of the present invention, and FIG. 2 is a schematic diagram of a measuring instrument showing another embodiment. 1 is the sample 2 is the metal cable 7B 3 is the eddy current 4 is the signal cable 5 is the load cell 6 is the signal cable 7 is the device outer ceiling 8 is the device outer floor Patent applicant Toshimaru Takemoto, Patent attorney Matsushita Electric Works Co., Ltd. (2 others) Figure 1 Figure 2

Claims (3)

[Claims] (1) A device for simultaneously measuring dimensional changes and weight changes of an object, in which a non-contact displacement meter is used to measure dimensional changes, and a weight measuring device is used within a limit that does not cause an error in the displacement measurement. A device for simultaneously measuring changes in dimensions and weight, characterized by using a measuring device that can measure changes in weight within the displacement of a sample. (2) The device for simultaneously measuring changes in dimensions and weight according to claim 1, wherein the displacement meter is a non-contact displacement meter using eddy current. (3) A device for simultaneously measuring changes in dimensions and weight according to claim 1 or 2, wherein the weight measuring device is constructed using a load cell.