Laser apparatus
US5631917A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1996 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Feb 22, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/0407
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
To adapt temperature control of a secondary cooling water to the temperature of a primary cooling water: A control apparatus computes duty factor D from measured open time period T.sub.ON and closed time period T.sub.OFF of a solenoid valve (step B3) for each cycle of the solenoid valve operation (step B2). The apparatus classifies the computed duty factor into one of a plurality of predetermined ranges and conditionally updates the reference temperature Pt of the secondary cooling water based on the classification (B5, B6, B7). If the reference temperature has reached an upper limit P.sub.MAX and if the duty factor has exceeded an upper limit, e.g., 95 percent (B8), the apparatus stops the operation of a laser oscillator and provides an alarm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.