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c) Pression atmosphérique: 700 hPa~1060 hPa
3 PRINCIPE ET PRÉCAUTIONS D’EMPLOI
3.1 Principe de la mesure
Principe de l’oximètre est le suivant: Une formule d’ex-
périence du traitement des données consiste à utiliser
la loi de Beer-Lambert relative au principe d’absorbance
de la lumière rouge & infrarouge par l’hémoglobine (Hb)
et par l’oxyhémoglobine (HbO2). Principe d’utilisation de
l’instrument: La technique de mesure photoélectrique
de l’oxyhémoglobine ainsi que la technique d’analyse
et d’enregistrement de la capacité cardiaque sont utili-
sées de façon à ce que deux rayons de lumière émet-
tant des longueurs d’onde différentes, se concentrent
sur l’ongle humain, au moyen d’un capteur avec pince à
doigt. Le signal mesuré est alors recueilli par un élément
photosensible qui permet d’afcher les informations
acquises sur l’écran grâce au traitement des données
effectué par des circuits électroniques et un micropro-
cesseur.
Figure 1. Principe de fonctionnement
3.2 Attention
1. Le doigt doit être placé correctement (voir l’illustration
de ce manuel, Figure 5), sinon cela pourrait provoquer
des mesures inexactes.
Tube d’émission
Rouge et infra-rouge
Tube récepteur
Rouge et infra-rouge
FRANÇAIS
8


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