http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2001318051-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_49c7c7d947f4481d87620430416a22b3 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_bb5143c5d291d49c700ac1631bdd20df |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N21-3563 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N21-35 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01M11-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N21-3563 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N21-359 |
| filingDate | 2000-05-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_06652e047d0ef36f89af1e09c4eb9c54 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b584cb7666cf7767f7225b015845e39d http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_83622553f5e13585e73ce68d1b383ed2 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1a75bd196e357e196daa32e0f2f00587 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4d78468a12235da32a78c9f6061be166 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4c55cdb6d72e8b2be9b73d32779d3967 |
| publicationDate | 2001-11-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-2001318051-A |
| titleOfInvention | Method for measuring trace OH group concentration in quartz glass |
| abstract | (57) [Summary] [Purpose] To easily determine the concentration of trace OH groups in a quartz glass body, To provide a method for measuring accurately. SOLUTION: O in quartz glass is measured by infrared spectrophotometry. In the H group concentration measurement, a measurement test piece and a blank test piece having two opposing planes were prepared from a quartz glass body for measurement and a quartz glass body for blank having a known OH group content. The infrared light in the range of approximately 2500 nm to approximately 2950 nm is sequentially incident perpendicularly on one of the two opposed planes, and at the same time, the emitted light is detected from the other surface. A spectrum is obtained, an OH group absorption peak at 2720 nm is selected, and from the peak height, the following equation is obtained: C sample = C blank + ΔA / Lε × (M H + M O ) / ρ × 10 3 (where C sample is the OH group concentration (wt · ppm) in the test piece for measurement, and C blank is O in the blank test piece. H group concentration (wt.ppm), ΔA is peak height (AB S. ), L is the optical path length (cm), ε is the extinction coefficient (l · mo) l -1 · cm -1 ), M H is the atomic weight of hydrogen, M O is the atomic weight of oxygen, and ρ is the density (g · cm -3 ) of quartz glass. ), Characterized in that it is calculated by using Method for measuring H group concentration. |
| priorityDate | 2000-05-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
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