Radiant energy – Luminophor irradiation
Patent
1987-03-20
1990-02-13
Fields, Carolyn E.
Radiant energy
Luminophor irradiation
2502521, 2504612, 356 41, G01N 2164
Patent
active
049009338
ABSTRACT:
Sensing apparatus for remote sensing of quantities such as blood oxygen concentration using a phosphorescent material located at one end of an optical fiber. The phosphorescent material emits a relatively long-lived luminescence when exposed to energy in a predetermined wavelength range. The sensing apparatus includes a light source for generating an incident pulsed energy signal within the predetermined wavelength range and a detector subsystem for selectively detecting the long-lived luminescence from the phosphorescent material. The light source and the detector subsystem are coupled to the other end of the optical fiber along a common optical path. The detector subsystem includes dual channels for detecting a measuring wavelength and a reference wavelength in the long-lived luminescence. The detector subsystem is inhibited during the incident pulsed energy signal to provide low noise operation. The detected signals are integrated and averaged to improve accuracy. A calibration source is provided for calibrating the detection subsystem.
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Nestor James R.
Priest Benjamin H.
Schiff Jonathan D.
C. R. Bard Inc.
Fields Carolyn E.
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