GB1255091A - Improved moisture detector and analyzer - Google Patents
Improved moisture detector and analyzerInfo
- Publication number
- GB1255091A GB1255091A GB74369A GB74369A GB1255091A GB 1255091 A GB1255091 A GB 1255091A GB 74369 A GB74369 A GB 74369A GB 74369 A GB74369 A GB 74369A GB 1255091 A GB1255091 A GB 1255091A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- crystal
- change due
- oscillator
- salt
- 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
- 239000013078 crystal Substances 0.000 abstract 3
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 abstract 2
- 150000003839 salts Chemical class 0.000 abstract 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract 1
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 229910001628 calcium chloride Inorganic materials 0.000 abstract 1
- 239000001110 calcium chloride Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Inorganic materials [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/025—Change of phase or condition
- G01N2291/0256—Adsorption, desorption, surface mass change, e.g. on biosensors
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
1,255,091. Piezoelectric elements. ESSO RESEARCH & ENG. CO. 6 Jan., 1969, No. 743/69. Heading H1E. [Also in Divisions C1 and G1] Apparatus for measuring moisture content comprises a piezo-electric crystal coated with a deliquescent salt. The crystal forms the frequency determining circuit of an oscillator, Fig. 1 (not shown), so that the frequency is determined in accordance with ambient relative humidity. In use a test oscillator is beat with a reference and the difference frequency component integrated and indicated. The salt is lithium or calcium chloride or lithium bromide and is of thickness 70-200 Angstroms. Fig. 2 gives results for three detectors, #F 0 is the frequency change due to the dry coating, #F is the further change due to moisture absorption, the natural resonant frequency of the crystal being about 9 MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB74369A GB1255091A (en) | 1969-01-06 | 1969-01-06 | Improved moisture detector and analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB74369A GB1255091A (en) | 1969-01-06 | 1969-01-06 | Improved moisture detector and analyzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1255091A true GB1255091A (en) | 1971-11-24 |
Family
ID=9709753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB74369A Expired GB1255091A (en) | 1969-01-06 | 1969-01-06 | Improved moisture detector and analyzer |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1255091A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009153406A1 (en) * | 2008-06-18 | 2009-12-23 | Valtion Teknillinen Tutkimuskeskus | Indicator |
-
1969
- 1969-01-06 GB GB74369A patent/GB1255091A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009153406A1 (en) * | 2008-06-18 | 2009-12-23 | Valtion Teknillinen Tutkimuskeskus | Indicator |
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