Exponential decay time constant measurement using frequency of o

Details Exponential decay time constant measurement using frequency of o Exponential decay time constant measurement using frequency of o

1987-05-08

1987-12-29

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 78R, 331 25, G01R 2316

Patent

active

047163631

ABSTRACT:
Oxygen determination based on luminescence quenching of fluorescent dye is effected by using the frequency output of an offset-phase locked loop to calculate the time constant for the exponential decay of fluorescence. An offset phase angle between a periodic stimulus signal used to excite the dye and a response signal based on fluorescence detection is predetermined to optimize signal-to-noise ratio for a wide range of time constants. An offset-phase locked loop is used to vary the frequency of a periodic stimulus signal until the predetermined phase relationship is established. Where the stimulus and response signals are substantially sinusoidal, the offset phase angle is ideally about 49.3.degree., although substantially optimal performance is achieved using a more conveniently generated 45.degree.. The 45.degree. angle offset can also be used with a square-wave stimulus signal.

REFERENCES:
patent: 3939405 (1976-02-01), Mutziger
patent: 4109283 (1978-08-01), Rast
patent: 4670887 (1987-06-01), Heatherington

Affiliated with

Also associated with

Rating

Exponential decay time constant measurement using frequency of o does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exponential decay time constant measurement using frequency of o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exponential decay time constant measurement using frequency of o will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-464860