http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3625621-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_6fcaffc23e84e1a7269de0d17be11b37 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01N21-27 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G01J1-1626 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01J1-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G01N21-27 |
| filingDate | 1969-07-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1971-12-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_81f142a859cd03af53b8e90e0dd3c13b |
| publicationDate | 1971-12-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-3625621-A |
| titleOfInvention | Optical densitometer |
| abstract | The optical densitometer of the present invention includes a photoresistive element which has a nonlinear relationship between resistance and incident light. A source of light directs light energy through the specimen to be measured and onto the photoresistive element. The intensity of the light from the specimen also varies nonlinearly in accordance with the optical density of the specimen. These nonlinear variations are correlated so that the optical densitometer of the present invention produces an output reading which is directly proportional to the optical density of the specimen which in turn is proportional to the chemical concentration in the specimen. The present invention also includes the use of a pair of such nonlinear photoresistive cells in a bridge circuit with both cells responsive to a common light source but wherein only one cell is responsive to the light through the specimen. The use of two photoresistive cells compensates for any variation in the output from the light source. The present invention in addition includes the use of diode voltage limiting means across the indicating meter used to determine when the bridge is balanced so as to protect the indicating meter. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4099882-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4109159-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4090793-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4038555-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5650845-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4014610-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4251750-A |
| priorityDate | 1969-07-30-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 28.