Scintillation tube and ionization detector dynamic calibration monitor and feedback regulator
US5266883A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1992 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Aug 4, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01T1/185
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
An ionization detector dynamic calibration monitor that regulates the high voltage power supply to the detector. In a preferred embodiment, a voltage boost current source provides an input voltage for a power out voltage regulator and for a +14.75 volt board regulator. The board regulator provides a voltage reference for various circuitry, and provides a voltage reference for coarse calibration and display calibration adjustment circuitry. The power voltage regulator provides the high voltage power supply drive signal. An error amplifier drives an integrator, which, in turn, drives a bargraph display. An optically-isolated output circuit drives an external alarm or relay. In an alternative embodiment, the pulse width of a detected circuit is linearized and converted to an analog control signal. The analog control signal drives conventional power supply control circuitry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.