Method for the periodic determination of a quantity to be measured, using a reference signal

US4737652A · kind A · utility

Assignee

• A V L Gesellschaft fur Verbrennungskraftmaschinen und Messtechnik M.B. Prof. Dr. Dr.h.c. Hans List · AT

Inventors

• Leopold Faschingleitner · Mank, AT
• Peter W. Krempl · Leibnitz, AT
• Wolfgang Schindler · Graz, AT

Key dates

• Filing date: Apr 3, 1986
• Grant date: Apr 12, 1988
• Expiry date: Apr 3, 2006

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2201/127
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In order to eliminate equipment-generated fluctuations during the periodic determination of a quantity to be measured which is effected by forming the difference between a measuring signal which has been altered relative to a source signal by the measurement variable and a reference signal which has remained unaffected relative to the source signal by the measurement variable, a base signal level is determined for each measuring cycle as the difference between the reference level and a zero level in the absence of a source signal, subsequent to which each actual reference signal level and each measuring signal level is compensated with the previously determined reference signal level. By amplifying the compensated reference signals prior to difference formation and standardizing the signal difference to the base signal level, a high degree of accuracy may be achieved even if the attenuations of the measuring signal caused by the quantity to be measured are very small.