GB1114459A - Measuring system - Google Patents
Measuring systemInfo
- Publication number
- GB1114459A GB1114459A GB5373965A GB5373965A GB1114459A GB 1114459 A GB1114459 A GB 1114459A GB 5373965 A GB5373965 A GB 5373965A GB 5373965 A GB5373965 A GB 5373965A GB 1114459 A GB1114459 A GB 1114459A
- Authority
- GB
- United Kingdom
- Prior art keywords
- paper
- signal
- moisture
- thermistor
- housing
- 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
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
-
- 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
- G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
- G01N27/225—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity by using hygroscopic materials
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
1,114,459. Electrophysical measurement; moisture. INDUSTRIAL NUCLEONICS CORPORATION. Dec. 17, 1965 [Dec. 24, 1964], No. 53739/65. Heading G1A and G1M. Apparatus for measuring the moisture content of paper leaving a drying unit, comprises a sensing head arranged to scan across the width of the paper, carrying a capacitative moisture probe and an infrared temperature sensor to provide a temperature compensated humidity signal. The infrared detector has a further thermistor providing a signal to compensate for variations in the ambient temperature of its housing. A further measuring head detecting beta radiation through the paper may be provided to gauge the "weight" of the paper. In a preferred embodiment the moisture signal is derived from a dual frequency servo null system Fig. 7, similar to that disclosed in 939669. L. F. and H. F. signals are fed (i) through a phase inverter 168 to the sensing probes 130, 132, and (ii) through a balancing capacitor 174 to junction point 170. Any out of balance signal due to moisture variation is amplified at 176 and fed to H. F. and L. F. demodulators 182, 184. The amplitude difference between these signals energizes a servomotor 188 (i) to drive a potentiometer 166 in the output of the L. F. oscillator to rebalance the system, and (ii) to drive a potentiometer 190 providing a millivolt signal at the tapping proportional to the moisture content of the paper. The thermistors 70, 120 connected in resistance network 198 add a correcting signal when the temperature deviates from a standard setting, to provide a compensated output at 914, 196. INFRARED DETECTOR comprises a heat insulating housing Fig. 2, insulated from the atmosphere by a dead-air space between windows 68, 104 and containing a thermistor 70 with a blackened silver foil heat absorber disc 72 suspended from a pair of thin copper wires 74 at the focus of a mirror 98. A further thermistor 120 is mounted at the edge of the mirror to detect variations in the ambient temperature in the housing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42088964A | 1964-12-24 | 1964-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1114459A true GB1114459A (en) | 1968-05-22 |
Family
ID=23668257
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5373965A Expired GB1114459A (en) | 1964-12-24 | 1965-12-17 | Measuring system |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1598612B2 (en) |
| GB (1) | GB1114459A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486729A (en) * | 2016-01-18 | 2016-04-13 | 北京至感传感器技术研究院有限公司 | Humidity sensor |
| US10527533B2 (en) | 2015-09-11 | 2020-01-07 | Cem Corporation | Moisture and volatiles analyzer |
-
1965
- 1965-12-17 GB GB5373965A patent/GB1114459A/en not_active Expired
- 1965-12-22 DE DE19651598612 patent/DE1598612B2/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10527533B2 (en) | 2015-09-11 | 2020-01-07 | Cem Corporation | Moisture and volatiles analyzer |
| CN105486729A (en) * | 2016-01-18 | 2016-04-13 | 北京至感传感器技术研究院有限公司 | Humidity sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1598612B2 (en) | 1971-02-11 |
| DE1598612A1 (en) | 1969-08-21 |
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