書誌事項
- タイトル別名
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- 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
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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
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- 生体医工学
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生体医工学 43 (4), 724-729, 2005
公益社団法人 日本生体医工学会
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詳細情報 詳細情報について
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- CRID
- 1390282680244670720
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- NII論文ID
- 130004493968
- 110004704988
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- NII書誌ID
- AA11633569
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- ISSN
- 18814379
- 1347443X
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- NDL書誌ID
- 7886659
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDLサーチ
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