JP2001304990A - Method for calibrating contact pressure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a calibration method which becomes standards for a reproducibility or an accuracy of values of a contact pressure gage for soft objects and surfaces for measuring a constraining pressure to living bodies, a body pressure to beds or chairs, a wearing pressure of clothes, etc. SOLUTION: A soft bag 2 of a larger capacity than a capacity of a container 1 is set in the container 1 with an open lid 6. A fluid 3 controlled in pressure by a pressure regulator 4 is sealed in the soft bag 2 and is measured by a pressure gage 7. A face 8 to be measured where the calibration is carried out and a pressure-receiving sensor 9 of the contact pressure gage are set in the soft bag, to which the fluid 3 is brought in contact via the soft bag 2. A contact pressure is calibrated by measured values of the pressure gage 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for calibrating a contact pressure measuring device for a flexible surface, and a body pressure measuring device when a body is left in a chair, a bed, etc., and a pressure measuring device when clothes are worn. The present invention relates to a calibration method serving as a reference for checking the accuracy and reproducibility of a device for measuring a binding force and a palpation force when performing biological treatment or care.

[0002]

2. Description of the Related Art Conventionally, as a contact pressure calibration method for a flexible surface,
There has been a method in which a pressure receiving sensor is horizontally immersed in a liquid, the plane pressure is applied to the liquid, the depth is measured, and the depth is measured and confirmed by the product of the specific gravity of the liquid. The liquid mainly uses water or mercury. For example, when water is used, there is a limit because a high pressure requires a height of a water column. Also, when using mercury with a large specific gravity,
It was not easy to secure environmental problems and quantity. These were plane calibrations, and the actual measurement targets were many living organisms, most of which were soft and curved surfaces, and the surfaces were deformed with changes in the pressing force, and were not satisfactory as calibrations for practical surfaces. As another method, there has been a method in which a pressure receiving sensor is placed in a sealed container or chamber capable of adjusting the pressure, and the pressure in the container is adjusted and calibrated. Since this method applies pressure from all directions, it is a three-dimensional calibration, and it is difficult to calibrate the surface contact pressure. This method was originally performed with a strain gauge sensor or the like for the purpose of measuring fluid pressure. As another method, there is a method in which a weight is placed on a pressure receiving sensor and the weight is divided by a contact area to obtain a product. However, it is a vertical load, and it is a method that cannot be applied to curved or flexible surfaces. Further, in the method of pressing with an airbag and using the pressure value in the bag, the material tension of the bag acts and the applied pressure does not always become the contact pressure due to the influence of the characteristics.

[0003]

Therefore, the standards have not been established internationally, and calibration has been performed independently for each measuring device manufacturer, so that the measured values differ for each device. Researchers in the medical, welfare, nursing, rehabilitation, and clothing fields, which require common equipment, strongly demanded calibrated measurement values, but could not resolve them. The present invention is a method for calibrating the contact pressure of a flexible surface, which measures the surface pressure, the flexibility, elasticity, and the physical properties of a curved surface with a change in the applied pressure, and reproduces a complex situation in which the measurement force is changed. Establishment of a calibration method that can confirm whether the

[0004]

As a constitution, the pressure is transmitted as a surface pressure by bringing the container 1 into contact with the surface 8 to be measured through the flexible bag 2 or the flexible film 5 inside the container 1 and increasing the pressure inside the container 1. Further, since the volume of the flexible bag 2 or the container 1 and the flexible film 5 is larger than that before the contact with the surface 6 to be measured, the material tension of the flexible bag 2 and the container 1 and the flexible film 5 does not affect. The pressure is transmitted to the surface 6 to be measured as a surface pressure.

[0005]

When the surface to be measured 8 is a flexible object,
The material is deformed by receiving the pressure, and the large flexible bag 2 or the loose flexible film 5 is in close contact with the deformed surface without exerting the material tension. That is, under the condition that the volume A in the unloaded state in the container 1 is larger than the volume B in the state where the surface 8 to be measured is installed and the surface is pressed and pressed, the flexible bag 2
The flexible film 5 is not affected by the material tension at the time of expansion. Therefore, the pressure inside the container 1 is measured under pressure, and the flexible bag 2 or the flexible film 5 is transmitted to the surface 8 to be measured as a surface pressure, so that the contact pressure can be known. At this time, the flexibility of the flexible bag 2 and the flexible film 5 causes a repulsive stress to cause a transmission error.
Increasing its flexibility leads to high precision and high sensitivity.
Therefore, by adjusting the internal pressure of the container 1 by the pressure adjusting device 4, the surface pressure and the contact pressure can be controlled and calibrated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, in FIG.
The fluid 3 whose pressure is controlled by the pressure adjusting device 4 is sealed in the flexible bag 2, and the pressure inside the flexible bag 1 is measured by the pressure gauge 7. In FIG. 6, a surface 8 to be measured is placed, and a pressure sensor 9 of a contact pressure gauge is installed on the surface,
And 12, a surface pressure can be applied to the surface 8 to be measured by applying pressure to the inside of the flexible bag 2 by a fine pressure adjusting device. If the surface 8 to be measured is a flexible body, the flexible bag 2 keeps in close contact with the surface 8 to be deformed with pressure, and the surface pressure is not affected by the material tension as long as the flexible bag 2 has a sufficient capacity. Can be hung. Accordingly, by installing the pressure receiving sensor 9 of the contact pressure gauge on the surface of the surface 8 to be measured, the pressure receiving signal value of the pressure receiving sensor 9 is compared with the reference pressure gauge 7, and each tolerance is taken into consideration and set as a reference. Can be proofread. 2 and 4 show an embodiment in which the surface on which the surface 8 to be measured of the container 1 is located is opened, and as shown in FIG. This is an embodiment in which the calibration device itself is moved and calibrated when the measured surface 8 cannot be moved. 3 and 4 show the flexible bag 1.
However, this is an embodiment in which the same condition is satisfied by the flexible film 5.
FIG. 5 is an embodiment in which the peripheral wall of the container 1 is a movable wall 10 so as to be able to cope with the contact curved surface in FIGS.
As shown in FIG. 7, this is an embodiment in which the surface 8 to be measured is brought into close contact with the outer surface of the flexible bag 2 on the open surface of the container 1. At this time, when the container 1 and the surface 8 to be measured are brought into close contact with each other, the surface to be measured 8 is deformed by a flexible material so that a gap is formed around the periphery and the surface is not brought into close contact. Further, by measuring the temperature near the surface to be measured and correcting the pressure value and the thermal effect of the fluid 3, highly accurate calibration can be performed. A safety valve 13 is provided, and the pressure adjusting devices 4 and 12 are provided.
Opens the valve in the event of a failure of the micro-pressure regulator to prevent the container 1 and the like from being destroyed and to provide for safety.

[0007]

According to the present invention, since the flexible bag 2 having a larger volume than the container 1 or the container 1 and the flexible film 5 are required, the pressure substantially equal to the pressure applied to the inside of the container 1 is applied. Can be applied as surface pressure. That is, by adjusting the internal pressure of the container 1, the contact pressure of the curved surface or the flexible body can be known. Therefore, it is possible to know the reproducibility and accuracy of the contact pressure gauge of curved surfaces and flexible bodies, and to know the deformation and relaxation to external pressure, etc., which can be expected to lead to the improvement of those measuring devices and international standardization of measurement. . In addition, the external pressure is changed over time to clarify the relaxed state, deformation, and softness characteristics of the soft surface 8 to be measured. This is an interesting contact pressure calibration method that opens up prospects for care and education.

[Brief description of the drawings]

FIG. 1 is a sectional view of the configuration of the present invention.

FIG. 2 is a sectional view of one side of the container of the present invention opened.

FIG. 3 is a cross-sectional view of the container of the present invention having a loose soft film on one surface.

FIG. 4 is a cross-sectional view of the container of the present invention in which a soft film is provided on the open surface.

FIG. 5 is a sectional view of the present invention having a movable wall.

FIG. 6 is a sectional view of an embodiment of the present invention.

FIG. 7 is a sectional view of an embodiment in which one side of the container of the present invention is opened.

[Explanation of symbols]

 1 is a container 2 is a flexible bag 3 is a fluid 4 is a pressure regulator 5 is a flexible membrane 6 is an open lid 7 is a pressure gauge 8 is a surface to be measured 9 is a pressure receiving sensor 10 is a movable wall 11 is a thermometer 12 is a micro pressure regulator. Device 13 is a safety valve A is the volume before installation of the surface to be measured B is the volume where the surface to be measured is installed

Claims (8)

[Claims] (1) In a container 1 provided with an open lid 6,
A flexible bag 2 having a larger volume than the container 1 is provided. (B) The fluid 3 in the flexible bag 2 via the pressure adjusting device 4
Inflow. (C) A pressure gauge 7 for measuring the pressure of the fluid 3 is provided. The contact pressure calibration method configured as described above. 2. The method according to claim 1, wherein one side of the container is opened. 3. The container 1 is not provided with a flexible bag 2, but is provided with a flexible film 5 with sufficient deflection on the open side of the container 1, and the volume of the container 1 and the flexible film 5 is larger than the volume of the container 1. Claim 1
2. Contact pressure calibration method. 4. The contact pressure calibration method according to claim 1, wherein the peripheral wall of the container 1 comprises a movable wall 10. 5. The method according to claim 1, further comprising a thermometer for measuring the temperature in the container. 6. The contact pressure calibration method according to claim 1, further comprising a minute pressure adjusting device in the container. 7. A container 1 provided with a safety valve 13.
Pressure calibration method. 8. The contact pressure calibration method according to claim 1, wherein the open lid 6 can be detached.