JPS5773645A - Inspection device for internal pressure of air-tight container - Google Patents
Inspection device for internal pressure of air-tight containerInfo
- Publication number
- JPS5773645A JPS5773645A JP14996780A JP14996780A JPS5773645A JP S5773645 A JPS5773645 A JP S5773645A JP 14996780 A JP14996780 A JP 14996780A JP 14996780 A JP14996780 A JP 14996780A JP S5773645 A JPS5773645 A JP S5773645A
- Authority
- JP
- Japan
- Prior art keywords
- internal pressure
- permanent magnet
- search coil
- magnetic core
- container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/04—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by acoustic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/36—Investigating fluid-tightness of structures by using fluid or vacuum by detecting change in dimensions of the structure being tested
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
PURPOSE:To measure the internal pressure of a metallic container to be inspected accurately by providing a permanent magnet and a search coil between an energizing coil, which flows a single pulse current, and the end plate of said container and detecting current variations of the search coil. CONSTITUTION:A single-pulse current source 4 generates a pulse current to detect vibrations of a metallic end plate, forming the metallic lid of an airtight container 1, such as canned provisions, in a carboard case 2, by applying a single magnetic-force pulse. A magnetic core 7 wound with an energizing coil 5 forms a magnetic path together with an iron core 6, and a permanent magnet 8 is fitted atop of the magnetic core 7; and a search coil 9 is wound around a magnetic core 10 under the permanent magnet, and a cap 11 holds the magnetic core 10, search coil 9 and permanent magnet 8. A signal generated by the search coil 9 through the vibrations of the end plate 3 is processed by a signal processor 12 to discriminate the internal pressure of the metallic container 1. Thus, the size of the device is reduced, its S/N ratio is improved, and the propriety of the internal pressure is discriminated accurately.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14996780A JPS5773645A (en) | 1980-10-24 | 1980-10-24 | Inspection device for internal pressure of air-tight container |
| US06/218,770 US4399514A (en) | 1979-12-26 | 1980-12-22 | Method of inspecting internal pressures in sealed containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14996780A JPS5773645A (en) | 1980-10-24 | 1980-10-24 | Inspection device for internal pressure of air-tight container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5773645A true JPS5773645A (en) | 1982-05-08 |
Family
ID=15486523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14996780A Pending JPS5773645A (en) | 1979-12-26 | 1980-10-24 | Inspection device for internal pressure of air-tight container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5773645A (en) |
-
1980
- 1980-10-24 JP JP14996780A patent/JPS5773645A/en active Pending
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