发明名称 |
JITEISUNIKANRENSURUATAINOSOKUTEISOCHIOYOBISONOHOHO |
摘要 |
<p>Oxygen determination based on luminescence quenching of fluorescent dye is effected by using the frequency output of an offset-phase locked loop (15) 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 ration for a wide range of time constants. An offset-phase locked loop (15) is used to vary the frequency of a periodic stimulus signal until the predetermined phase relationship is established, and the frequency forms a measure of the decay rate. Where the stimulus and response signals are substantially sinusoidal, the offset phase angle is ideally about 49.3 DEG , although substantially optimal performance is achieved using a more conveniently generated 45 DEG . The 45 DEG angle offset can also be used with a square-wave stimulus signal.</p> |
申请公布号 |
JP2645270(B2) |
申请公布日期 |
1997.08.25 |
申请号 |
JP19880109795 |
申请日期 |
1988.05.02 |
申请人 |
HYUURETSUTO PATSUKAADO CO |
发明人 |
JON ENU DEYUUKUSU;UIRIAMU EFU KAARUSEN JUNIA;RICHAADO JEI PITARO |
分类号 |
G04F10/06;A61B5/145;A61B5/1459;A61B10/00;G01N21/31;G01N21/64;G01N25/00;G01R23/00;G06Q50/00;(IPC1-7):G01N21/64 |
主分类号 |
G04F10/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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