ゲート動作アバランシェフォトダイオードを用いた高感度反射型パルスオキシメータ

書誌事項

タイトル別名
  • A Sensitive Reflection-type Pulse Oximeter Using a Gated Avalanche Photodiode
  • ゲート ドウサ アバランシェフォトダイオード オ モチイタ コウカンド ハンシャガタ パルスオキシメータ

この論文をさがす

説明

We propose a reflection-type pulse oximeter that employs two pairs of a light-emitting diode (LED) and a gated avalanche photodiode (APD). One LED radiates a red line with an emission wavelength of 635 nm and the other a near-infrared line with 945 nm. These are driven with a pulse current at frequency ƒ (= 10 kHz). Superposition of a transistor-transistor-logic (TTL) gate pulse on a direct-current (dc) bias, which is set so as not to exceed the breakdown voltage of each APD, makes the APD work in a gain-enhanced operation mode. Each APD is gated at frequency 2ƒ (= 20 kHz), and the signal output is fed into a laboratory-made lock-in amplifier that works synchronously with the pulse modulation signal of each LED at frequency ƒ (= 10 kHz). A combination of the gated APD and lock-in like signal detection scheme is useful for the reflection-type pulse oximeter owing to the capability of detecting a weak signal against a large background light.

収録刊行物

  • 生体医工学

    生体医工学 43 (4), 724-729, 2005

    公益社団法人 日本生体医工学会

参考文献 (13)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ