GB1387007A - Method and apparatus for the non-contacting determination of contents of moisture - Google Patents
Method and apparatus for the non-contacting determination of contents of moistureInfo
- Publication number
- GB1387007A GB1387007A GB2962072A GB2962072A GB1387007A GB 1387007 A GB1387007 A GB 1387007A GB 2962072 A GB2962072 A GB 2962072A GB 2962072 A GB2962072 A GB 2962072A GB 1387007 A GB1387007 A GB 1387007A
- Authority
- GB
- United Kingdom
- Prior art keywords
- moisture content
- indicator
- neutron
- rays
- determined
- 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
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/09—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being neutrons
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
- G01N23/12—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the material being a flowing fluid or a flowing granular solid
Abstract
1387007 Measuring moisture content OSTERREICHISCHE STUDIENGESELLSCHAFT FUR ATOMENERGIE GmbH 23 June 1972 [24 June 1971] 29620/72 Heading G1A The moisture content of a material is determined by a method in which the material is irradiated with high energy neutrons and the number of thermal neutrons emitted in the forward direction is counted to determine the weight of hydrogen, simultaneously the total weight of the same portion of material is determined by measuring the absorption of γ-rays, and the two measurements are combined by multiplying the neutron count by the cube root of the γ-ray count. As shown, Fig. 1, a material 1 such as sintered metal ore on a conveyor belt 2 is passed between a radioactive source 3 and a detector 4 the output of which is passed to two discriminators 7, 8 which select only those pulses corresponding to thermal neutrons and γ-rays respectively. The discriminator outputs are converted to logarithmic form (9, 10) and one third of the gamma value is taken and added to the neutron value (11). A signal equal to the output value of adder 11 for the same material but having zero moisture content is selected from a store 13 containing the required values for a number of different materials and substracted in differential amplifier 12. The antilogarith is formed (14) and the resultant moisture content signal applied to an indicator 15 or via line 16 to a control system for the addition of water. The output signal is FD<SP>1/3</SP>/F 0 D 0 1/3 where F and D are the neutron and 7-data respectively and F 0 and D 0 are the corresponding stored data for the dry material, and this function is said to be independent of the thickness of the sample above a threshold value. The indicator 15 may provide audio or visual alarms for selected maximum or minimum values of the moisture content. A checking device 17 may provide an inhibiting signal to the indicator and control circuit or actuate an alarm in the layer thickness as determined from the 7-ray measurements drops below the linearity threshold level. The radiation source 3 comprises a central rod 18 of Am 241-Be emitting high energy neutrons surrounded by four rods of Cs-137 emitting 7-rays supported with a Cd shell (21) by paraffin wax (20), the shell also being supported within an outer shielding container (23) by paraffin wax (22) the outer layer of which contains B.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT549371A AT316174B (en) | 1971-06-24 | 1971-06-24 | Method and arrangement for measuring the moisture content of sintered ores independently of the layer height |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1387007A true GB1387007A (en) | 1975-03-12 |
Family
ID=3576411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2962072A Expired GB1387007A (en) | 1971-06-24 | 1972-06-23 | Method and apparatus for the non-contacting determination of contents of moisture |
Country Status (3)
| Country | Link |
|---|---|
| AT (1) | AT316174B (en) |
| DE (1) | DE2229846A1 (en) |
| GB (1) | GB1387007A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0057569A1 (en) * | 1981-01-28 | 1982-08-11 | Hitachi, Ltd. | Apparatus for measuring neutrons and gamma rays |
| US4794256A (en) * | 1986-01-31 | 1988-12-27 | Kay-Ray, Inc. | Fast neutron process measurement system |
| AU772405B2 (en) * | 1999-11-30 | 2004-04-29 | Scantech Limited | Method and apparatus for on line analysis |
-
1971
- 1971-06-24 AT AT549371A patent/AT316174B/en active
-
1972
- 1972-06-19 DE DE19722229846 patent/DE2229846A1/en active Pending
- 1972-06-23 GB GB2962072A patent/GB1387007A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0057569A1 (en) * | 1981-01-28 | 1982-08-11 | Hitachi, Ltd. | Apparatus for measuring neutrons and gamma rays |
| US4482808A (en) * | 1981-01-28 | 1984-11-13 | Hitachi, Ltd. | Apparatus for measuring neutrons and gamma rays |
| US4794256A (en) * | 1986-01-31 | 1988-12-27 | Kay-Ray, Inc. | Fast neutron process measurement system |
| AU772405B2 (en) * | 1999-11-30 | 2004-04-29 | Scantech Limited | Method and apparatus for on line analysis |
Also Published As
| Publication number | Publication date |
|---|---|
| AT316174B (en) | 1974-06-25 |
| DE2229846A1 (en) | 1972-12-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |