GB1344691A - Tuned circuit monitor for structural materials - Google Patents
Tuned circuit monitor for structural materialsInfo
- Publication number
- GB1344691A GB1344691A GB1344691DA GB1344691A GB 1344691 A GB1344691 A GB 1344691A GB 1344691D A GB1344691D A GB 1344691DA GB 1344691 A GB1344691 A GB 1344691A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tuned circuit
- loop
- april
- inductively coupled
- nature
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/24—Investigating the presence of flaws
Abstract
1344691 Determining nature of materials electrically NATIONAL RESEARCH DEVELOPMENT CORP 18 April 1972 [30 April 1971] 12390/71 Heading G1N The nature of solid materials, e.g. glass reinforced plastic, concrete, plastics, is determined by monitoring the Q and/or resonant frequency of at least one electrical tuned circuit embedded in the material, using an oscillator inductively coupled thereto. The tuned circuit includes a single loop conductor and a chip or parallel plate capacitor, the material acting as the dielectric for the capacitor, and the resistance of the loop varying with strain on the material. A "grid dip" oscillator inductively coupled to the loop may be used to detect changes in Q or frequency. Fatigue cracks, delamination, ingress of moisture, and state of cure of a resin can be detected in this manner.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1239071 | 1971-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1344691A true GB1344691A (en) | 1974-01-23 |
Family
ID=10003695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1344691D Expired GB1344691A (en) | 1971-04-30 | 1971-04-30 | Tuned circuit monitor for structural materials |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2221017A1 (en) |
| GB (1) | GB1344691A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2151059A (en) * | 1983-12-08 | 1985-07-10 | Helmersson Rune | Alarm apparatus for pipes |
| CN111721815A (en) * | 2020-06-18 | 2020-09-29 | 业成科技（成都）有限公司 | Touch device and curing rate detection method thereof |
-
1971
- 1971-04-30 GB GB1344691D patent/GB1344691A/en not_active Expired
-
1972
- 1972-04-28 DE DE19722221017 patent/DE2221017A1/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2151059A (en) * | 1983-12-08 | 1985-07-10 | Helmersson Rune | Alarm apparatus for pipes |
| CN111721815A (en) * | 2020-06-18 | 2020-09-29 | 业成科技（成都）有限公司 | Touch device and curing rate detection method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2221017A1 (en) | 1972-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3906340A (en) | Tuned circuit monitor for structural materials | |
| JPS6457391A (en) | Sensor and method for detecting changes in number of object | |
| ES2006169A6 (en) | Circuit for operating a magneto-elastic sensor. | |
| GB1344691A (en) | Tuned circuit monitor for structural materials | |
| US3600676A (en) | Moisture meter utilizing amplitude and bandwidth signals | |
| EP0294275A3 (en) | Device for monitoring the soundness of security wall, metallic or non-metallic, for automatically instigating an intervention in the event of any aggression used against it | |
| GB961914A (en) | Improvements in or relating to detecting apparatus | |
| GB1122922A (en) | Apparatus for the measurement of dielectric loss | |
| GB2272777A (en) | Measuring dielectric properties of materials | |
| GB1299203A (en) | Direct reading water content meter | |
| GB1082872A (en) | Improvements relating to moisture meters | |
| Outwater et al. | On the catastrophic failure of laminated structures | |
| GB1395045A (en) | Power factor measurement | |
| Denoel et al. | Micro-Dielectrometry--a New Technique for Monitoring Polymer Viscosity | |
| JPS54158894A (en) | Manufacture of composite piezoelectric ceramic plate | |
| SU428265A1 (en) | ||
| SUMMERSCALES | Dielectrometry | |
| Kim et al. | Defect Structure and Electrical Conduction Mechanism of Manganese Oxide-Titanium Dioxide | |
| SU1087863A1 (en) | Device for measuring material humidity | |
| Martirosian | Taking into account the effect of the orientation of a specimen on the relation between the creep stresses and strains of svam fiber-glass-reinforced plastic(Fiberglass reinforced plastics, investigating effect of specimen orientation on creep stresses and strains) | |
| SU465583A1 (en) | Capacitive moisture meter | |
| Michaeli et al. | Dielectric Sensors for Low-Cost Cure Control | |
| VIDOUSE | Determination of the technical constants of laminates in oblique directions. Theory and experimental results(noting strain gage type influence) | |
| GURSKII et al. | Method of studying the resistivity to external effects in fiberglass plastic structural elements with highly dispersed initial-state properties | |
| Roman et al. | Acoustic emission characterization of fracture mechanisms in Kevlar-epoxy composites |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |