GB1052171A - - Google Patents
Info
- Publication number
- GB1052171A GB1052171A GB1052171DA GB1052171A GB 1052171 A GB1052171 A GB 1052171A GB 1052171D A GB1052171D A GB 1052171DA GB 1052171 A GB1052171 A GB 1052171A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mirror
- dewpoint
- thermo
- temperature
- gas
- 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.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
- G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
- G01N25/68—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point by varying the temperature of a condensing surface
Landscapes
- Physics & Mathematics (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 Using Thermal Means (AREA)
Abstract
1,052,171. Measurement of dewpoint of gases. CAMBRIDGE SYSTEMS Inc. Jan. 27, 1964. No. 3333/64. Headings G1A and G1S. [Also in Division H1] Apparatus for the determination of the dewpoint of a gas comprises a mirror attached to a thermoelectric junction which is cooled by the passage of current through the junction and apparatus responsive to changes in reflectivity of the mirror, due to vapour from the gas condensing on its surface, which controls the current through the junction to maintain the temperature of the mirror at the dewpoint of the gas. Fig. 4 shows a part sectional view of the apparatus comprising a light source 12, a mirror 26 mounted on thermoelectric elements 57 and 59, and a photo resistive cell 30, mounted in a light tight cavity 114. Also in the cavity is a reference mirror 24 mounted in good heat conductive relation with the hot junction 86 of the thermo-electric cooling device, the light from the reference mirror 24 being received by a second photo resistive cell 28. The hot junctions 86 and 88 of the thermo electric cooling device are both mounted on a heat sink 92, 93, from which they are insulated by a film of mica 96, and by which they are maintained at ambient temperature. The gas whose dewpoint is to be measured is blown through a nozzle 79 on to the mirror 26 on which the vapour condenses if the temperature of the mirror is below the dewpoint. Fig. 1 shows the circuit arrangement in which the light from source 12 reflected by the cooled mirror 26 and the reference mirror 24 is received by photo resistive cells 30 and 28 respectively, which are connected in a bridge circuit 34 energized by battery 40. The unbalance voltage of the bridge is amplified by the transistor amplifier and serves to reduce the cooling current flowing through the thermo-electric cooling device 52 and so to reduce the condensation on the mirror to the balance point at which the mirror temperature is the dewpoint of the gas blown over the mirror by blower 78. The temperature of the mirror 26 may be measured thermo electrically or by a thermo-sensitive resistor at 80 and indicated by unit 84.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1052171A true GB1052171A (en) |
Family
ID=1756837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1052171D Active GB1052171A (en) |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1052171A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2188163A (en) * | 1986-03-18 | 1987-09-23 | British Petroleum Co Plc | Testing degradation of a sample under thermal cycling |
| GB2206697A (en) * | 1987-06-11 | 1989-01-11 | Junichi Nishizawa | Measuring very low water content in gas |
-
0
- GB GB1052171D patent/GB1052171A/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2188163A (en) * | 1986-03-18 | 1987-09-23 | British Petroleum Co Plc | Testing degradation of a sample under thermal cycling |
| GB2206697A (en) * | 1987-06-11 | 1989-01-11 | Junichi Nishizawa | Measuring very low water content in gas |
| GB2206697B (en) * | 1987-06-11 | 1991-12-18 | Junichi Nishizawa | Measuring the dew-point or frost-point of a gas |
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