25 SpO 2 2014 3 19 10-3A257
,.,, 1. LED, 1450nm 1450nm 2mm 2mm LED 1mm 1mm
1 1 1.1................................. 1 1.2................................. 1 2 2 2.1............................... 2 2.2.............................. 6 2.3.................................. 6 2.3.1.............................. 6 2.3.2.............................. 7 2.3.3........................... 7 2.4.............................. 9 2.5.......................... 9 3 11 3.1................................. 11 3.2................................. 12 4 13 4.1.......................... 13 4.2................................. 14 4.3................................. 14 5 16 6 17 7 18 A A-19 B B-20 C C-21 i
D D-22 D.1 LED...........................D-22 D.2..............................D-23 E E-24 E.1 LED................................E-24 E.2 LED1..............................E-26 E.3 LED2..............................E-28 E.4.......................E-30 E.5 InGaAs.......................E-32 ii
1 1.1,.,, 1. 1.2 SpO 2 SpO 2 1
2 2.1 (Hb) (HbO 2 ) 2.1 Hb 660nm HbO 2 950nm 920nm 988nm 920nm 988nm A.1 1450nm 2.2 2.3 1450nm 2.4 660nm 950nm 1450nm 3 LED 2
2.1 HbO2 Hb 3
4 2.2
2.3 2.4 5
2.2 LED LED 2.1 2.1 nm LED(A) KED351RKD 660 Hb LED(B) KED501H 950 HbO 2 LED(C) KEDE1454H 1450 GUL PD(a) KPD1201C 400 1000 Hb,HbO 2 PD(b) KPDE030DL 950 1600 GUL 2.3 2.3.1 LED(A),(B),(C) 5V R01:200Ω C01:0.1μF C02:10μF R03:510Ω 5V R02:10kΩ PD(a),(b) 3 8 2 4 OP 1 R06:46kΩ 5 6 OP 7 R07: 10kΩ R08:1MΩ R04: 10kΩ R05:1MΩ C03:0.47μF C04:0.47μF 2.5 1 6
2 A1=R05/R04=100 A2=R08/R07=100 100 100=10000 1201C OP 30mV 4 5V OP 030DL OP 10mV 400 600mV OP 1201C. LED 30 60mV. 50mV. 2.6. 2.3.2 5V R2 5V LED(A),(B),(C) R1 C1 R3 C2 PD(a),(b) R4 3 8 2 4 OP1 1 C4 C5 R6 R8 R7 6 5 C6 R9 OP1 7 R5 C3 2.6 2 A1=R05/R04=100 A2=R09/R08=100 100 100=10000 2.3.3 2.7 7
2.7 3 2.2 R1 200 1/4W 1 R2,R4,R8 1k 1/4W 3 R3 510 1/4W 1 R5,R9 100k 1/4W 2 R6,R7 27k 1/4W 2 C1 0.1 F 1 C2,C4 10 F 50V 2 C3 0.47 F 1 C56 8200pF 1 C6 3900pF 1 8
2.4 1450nm I 2.1 I... [W/m 2 ] I 0... [W/m 2 ] α... [cm 1 ] x... [cm] I = I 0 e αx (2.1) B.1 1450nm α = 32.7 C.1 2.8 2.8 2.5 660nm 950nm Hb,HbO 2 1450nm 2.7 LED 9
2.8 LED 2mm LED 2mm LED フォトダイオード フタ ケース 注入口 LED 2.9 10
3 2.6 LED LED 1mm 3.1 1. 2.6 2. AD PC 3. LED 1mm 4. 5. LED 11
3.2 LED 3.1 3.1 V LED λ PD(a) PD(b) nm 400 1000 950 1600 LED(A) 660 4.408 0.244 LED(B) 950 4.580 2.816 LED(C) 1450 0.236 1.878 LED 0.124 0.230 LED(B) PD(a) PD(b) PD(b) LED(B) LED(C) LED(C) PD(b) 12
4 4.1 1. 2.7 LED 2. 3. 1450nm 4.1 V LED 0.326 0.326 0.327 0.325 0.326 0.326 1450nm 13
4.2 LED 1. LED 2. 2mm 3. 4. 10% 25% 5. 6. 7. 4.3 4.2 4.2 1 V 3.307 0.289 10% 0.281 25% 0.291 4.2 1450nm LED LED LED E.5 KEDE1454H 14
100mA 0.8V LED R 4.1 R = (V cc V F )/I F (4.1) R... [ ] V cc... [V] V F... [V] I F... [A] 5V 8 R=52 E24 56 LED LED 200 56 4.3 4.3 2 V 4.360 0.288 10% 0.280 25% 0.279 LED 0.194 LED 10% 25% 10% 10% 25% LED LED LED 2mm 1450nm 15
5 4.2 1/10 LED 0.3V., 0.3V. 2mm LED, 1/10. LED, 1mm. LED 4.3 10% LED 1mm 16
6 3.1. PD(a) PD(b),PD(b). 4.2 1450nm 2mm LED. LED,LED, 1mm. LED LED 1mm 17
7 1. 2. 18
A (cm -1 ) A.1 A-19
B B.1 B-20
C C.1 cm V ( ) V 0 1.0000 5.0000 0.01 0.7261 3.6307 0.02 0.5273 2.6365 0.03 0.3829 1.9145 0.04 0.2780 1.3902 0.05 0.2019 1.0095 0.06 0.1466 0.7330 0.07 0.1065 0.5323 0.08 0.0773 0.3865 0.09 0.0561 0.2807 0.10 0.0408 0.2038 0.11 0.0296 0.1480 0.12 0.0215 0.1075 0.13 0.0156 0.0780 0.14 0.0113 0.0567 0.15 0.0082 0.0411 0.16 0.0060 0.0299 0.17 0.0043 0.0217 0.18 0.0032 0.0158 0.19 0.0023 0.0114 0.20 0.0017 0.0083 0.21 0.0012 0.0060 0.22 0.0009 0.0044 0.23 0.0006 0.0032 0.24 0.0005 0.0023 0.25 0.0003 0.0017 0.26 0.0002 0.0012 0.27 0.0002 0.0009 0.28 0.0001 0.0006 0.29 0.0001 0.0005 0.30 0.0001 0.0003 C-21
D D.1 LED 10.0 Φ4.6 3.0 2.0 3.0 10.0 12.0 4.0 Φ4.6 4.0 20.0 D.1 D-22
D.2 3.0 6.0 12.0 2.0 8.0 2.0 20.0 D.2 D-23
E E.1 LED E.1 LED E-24
E.2 LED E-25
E.2 LED1 E.3 LED1 E-26
E.4 LED1 E-27
E.3 LED2 E.5 LED2 E-28
E.6 LED2 E-29
E.4 E.7 E-30
E.8 E-31
E.5 InGaAs E.9 InGaAs E-32
E.10 InGaAs E-33
E.11 ( :mm)(1) (2) (3) E-34
[1],, 8 [2],,, (2013-01) [3], IC 5,, (1977-12)217 223 E-35