Method for detecting sphere bag internal pressure and surface tangent tension through surface

Abstract

A method for detecting sphere bag internal pressure and surface tangent tension through the surface is suitable for a portable elastic soft bag internal pressure tester with the patent application number of 201210196575.6. A mathematic relation formula of the displacement value W, bag internal pressure P, the bag radius R and surface tangent tension T is established according to experimental data and model analysis, and the detected displacement value is subject to the common effect of the bag internal pressure and the bag surface tangent tension. The detection rage of the tester can be adjusted through the conversion coefficient alpha of W and F, the pressing cap radius r, the perimeter c and the area s; and a simplified linear equation in two unknowns can be used for calibration of the tester and setting of the conversion coefficient.

Description

[0001] Field [0002] The present invention is a method for detecting the internal pressure and surface tangent tension of a sphere through the surface, and it is a calculation method applicable to the conversion between the theoretical model and the actual value of the portable elastic soft capsule internal pressure measuring instrument of the earlier patent No. 201210196575.6. Background technique [0003] In the known internal pressure measurement of the sphere, there is a positive correlation between the surface hardness of the sphere and the intracapsular pressure. The design of the mechanical and electronic tonometer is based on this principle. For example, CN202223211U is an electronic method of a conventional mechanical tonometer. The design of the meter takes advantage of the huge gap between the softness and hardness of the sclera of the eyeball and the cornea. The outer end of the detection head is fixed on the hard sclera without affecting the intraocular pressure, ...

AI Technical Summary

Problems solved by technology

[0003] In the known internal pressure measurement of the sphere, there is a positive correlation between the surface hardness of the sphere and the intracapsular pressure. The design of the mechanical and electronic tonometer is based on this principle. For example, CN202223211U is an electronic method of a conventional mechanical tonometer. The design of the meter takes advantage of the huge gap between the softness and hardness of the sclera of the eyeball and the cornea. The outer end of the detection head is fixed on the hard sclera without affecting the intraocular pressure, and the cylindrical detection head can deform the soft cornea by applying pressure. Intraocular pressure is detected; for a homogeneous soft capsule, firstly, its outer end cannot be accurately positioned on the surface of the capsule, and thirdly, the measuring cylinder is closely attached to the outer end like a piston sleeve, and the extrusion of the cylinder to the surface of the capsule The pressure will affect the positioning of the outer end, and the extrusion of the outer end will affect the pressure of the capsule. Therefore, the tonometer cannot accurately detect the internal pressure of the homogeneous soft capsule; according to CN2288698Y micro-displacement non-contact intraocular pressure The product designed by the design has been put into use on the market. Its principle is to blow the cornea of ​​the eyeball with a constant flow of airflow, and the photoelectric sensor detects the position movement of the cornea when it is affected by the blowing force, so as to measure the intraocular pressure. However, this method is suitable for patients with low pressure. Intraocular pressure, cannot be used for manometry of larger pressure capsules

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