Method and device for measuring with synchronous detection...

G - Physics – 01 – R

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

G01R 29/02 (2006.01)

Patent

CA 2562577

The invention relates to electronic circuits for measuring by synchronous detection low signal whose reference level is unknown and is exposed to important fluctuations. The inventive method consists in carrying out a first double sampling correlated between a time (T1) just prior to the start of a measuring pulse and a time (T2) just prior to the end thereof, afterwards in carrying out a second double sampling correlated between the time (T2) and a time (T3) after the end of the measuring pulse and in determining the difference between the levels of the emitted measuring pulses, wherein said difference represents a signal value (Vm) considered with respect to a reference level between the reference levels at times (T1,T3). Said invention can be used for measuring the light transmission or light reflection coefficients of a medium crossed by light and by light pulse transmission superimposed at ambient light and for synchronously detecting the received light.

L'invention concerne les circuits électroniques de mesure, par détection synchrone, de signaux faibles dont le niveau de référence est mal connu et sujet à des fluctuations fortes. On effectue un premier double échantillonnage corrélé entre un instant T1 situé juste avant le début de l'impulsion de mesure et un instant T2 situé juste avant la fin de l'impulsion de mesure ; puis on fait un deuxième double échantillonnage corrélé entre l'instant T2 et un instant T3 situé après la fin de l'impulsion de mesure. Enfin, on fait la différence entre des niveaux de signal issus des deux mesures, cette différence étant une représentation de la valeur de signal Vm considérée par rapport à un niveau de référence qui est intermédiaire entre les niveaux de référence aux instants T1 et T3. Application : mesure de coefficient de transmission ou réflexion lumineuse d'un milieu traversé par la lumière, par émission d'impulsions lumineuses qui se superposent à l'éclairement ambiant, et détection synchrone de la lumière reçue.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method and device for measuring with synchronous detection... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and device for measuring with synchronous detection..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and device for measuring with synchronous detection... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1838124

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.