GB1240897A - Apparatus and method for differential thermal analysis - Google Patents
Apparatus and method for differential thermal analysisInfo
- Publication number
- GB1240897A GB1240897A GB44043/68A GB4404368A GB1240897A GB 1240897 A GB1240897 A GB 1240897A GB 44043/68 A GB44043/68 A GB 44043/68A GB 4404368 A GB4404368 A GB 4404368A GB 1240897 A GB1240897 A GB 1240897A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thermocouples
- substances
- test
- difference
- controlled
- 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
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/48—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation
- G01N25/4846—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation for a motionless, e.g. solid sample
- G01N25/4866—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on solution, sorption, or a chemical reaction not involving combustion or catalytic oxidation for a motionless, e.g. solid sample by using a differential method
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (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)
Abstract
1,240,897. Electric differential thermal analysis. NATIONAL INSTITUTE FOR METALLURGY. Sept.17, 1968 [Sept. 21, 1967], No. 44043/68. Heading G1N. In differential thermal analysis, the temperatures of a test substance and a reference substance are varied at the same rate and the temperature of the test substance, the temperature difference between the substances and the difference in power consumption between the substances are recorded. Any desired gap may be set between the temperatures of the two substances and this gap may be adjusted so that onset of crystallization occurs simultaneously in both substances. As shown in Fig. 2, the reference and test substances are located at the junctions of reference and test thermocouples 76 and 80 respectively. Heating current is supplied to the thermocouples 76, 80 during positive half cycles of an A.C. supply 32. The heat supplied to the reference thermocouple 76 is controlled by an S.C.R. 38 whose firing angle is controlled by a programme unit 40 and the heat supplied to the test thermocouple 80 is controlled by an S. C. R. 48 whose firing angle is controlled in dependence on the difference between the e. m.f. s of the thermocouples 76, 80, which is measured during the negative half cycles of the A.C. supply. Vacuum sealed thermocouples 44, 52 are connected in series with the reference and test thermocouples respectively and the difference between the e. m. f. s of the vacuum sealed thermocouples is amplified during negative half cycles and recorded as the difference in heat consumption between the substances. Also during negative half cycles synchronous contacts connect the e.m.f. of thermocouple 80 and the difference between the e.m.f.s s of thermocouples 76 and 80 to the recorder 30. In another arrangement, Fig. 5 the firing angles of the heat controlling S.C.R.s 38À1, 48À1 are controlled so as to keep the e. m.f. s of the reference and test thermocouples equal to that generated by a programme unit 284. An adjustable source 290 allows any desired temperature difference between the substances to be set. Hall generators 44À1, 52À1 are used to measure the square of the heating current. Heat shields. The reference and test thermocouples may be shielded to avoid heat losses by heating filaments (272, 274) maintained at the same temperatures as the thermocouples by S. C. R.s (280, 282).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA675680 | 1967-09-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1240897A true GB1240897A (en) | 1971-07-28 |
Family
ID=25561113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB44043/68A Expired GB1240897A (en) | 1967-09-21 | 1968-09-17 | Apparatus and method for differential thermal analysis |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1798283A1 (en) |
| GB (1) | GB1240897A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0785423A1 (en) * | 1996-01-11 | 1997-07-23 | The Perkin-Elmer Corporation | Heater control circuit |
| EP1150117A2 (en) * | 2000-04-26 | 2001-10-31 | Seiko Instruments Inc. | Differential Scanning Calorimeter |
-
1968
- 1968-09-17 GB GB44043/68A patent/GB1240897A/en not_active Expired
- 1968-09-20 DE DE19681798283 patent/DE1798283A1/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0785423A1 (en) * | 1996-01-11 | 1997-07-23 | The Perkin-Elmer Corporation | Heater control circuit |
| EP1150117A2 (en) * | 2000-04-26 | 2001-10-31 | Seiko Instruments Inc. | Differential Scanning Calorimeter |
| EP1150117A3 (en) * | 2000-04-26 | 2003-10-22 | Seiko Instruments Inc. | Differential Scanning Calorimeter |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1798283A1 (en) | 1971-10-07 |
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