From 8b2de3cd4c8820d7e0097b0ce1012ba0341e1bda Mon Sep 17 00:00:00 2001 From: Boyce Root Date: Sun, 17 Aug 2025 23:37:01 +0000 Subject: [PATCH] Add Obstetrics - Harmac --- Obstetrics - Harmac.-.md | 9 +++++++++ 1 file changed, 9 insertions(+) create mode 100644 Obstetrics - Harmac.-.md diff --git a/Obstetrics - Harmac.-.md b/Obstetrics - Harmac.-.md new file mode 100644 index 0000000..6ef351b --- /dev/null +++ b/Obstetrics - Harmac.-.md @@ -0,0 +1,9 @@ +
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Certain constituents within the blood have an effect on the absorption of mild at various wavelengths by the blood. Oxyhemoglobin absorbs gentle more strongly in the infrared region than within the purple area, whereas hemoglobin exhibits the reverse habits. Therefore, extremely oxygenated blood with a high concentration of oxyhemoglobin and a low focus of hemoglobin will are inclined to have a excessive ratio of optical transmissivity within the crimson region to optical transmissivity in the infrared area. These alternating parts are amplified and then segregated by sampling units operating in synchronism with the pink/infrared switching, in order to provide separate alerts on separate channels representing the pink and infrared mild transmission of the body structure. After low-pass filtering to take away signal components at or above the switching frequency, [BloodVitals home monitor](http://wiki.envirobatbdm.eu/Utilisateur:KimberlySturm2) each of the separate indicators represents a plot of optical transmissivity of the body construction at a selected wavelength versus time. AC component caused solely by optical absorption by the blood and various at the pulse frequency or coronary heart price of the organism.
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Each such sign additionally includes an invariant or DC part related to other absorption, akin to absorption by tissues other than blood in the body construction. AC and [BloodVitals SPO2](http://giggetter.com/blog/19335/bloodvitals-spo2-revolutionizing-home-blood-oxygen-monitoring/) DC elements of those alerts. IR" LED drive 24 are related to LED's 16 and 18 respectively. 26 is organized to actuate LED drives 22 and 24, and therefore LED's sixteen and 18, in line with a predetermined alternating sequence interspersed with dark intervals. During each such darkish interval, the timing unit 26 deactivates the LED drives and hence deactivates each LED's. Thus, the LED drives and LED's present alternating crimson and infrared illumination, whereas the timing unit periodically interrupts this illumination to provide the darkish intervals. 34 can be provided. Preamplification means 34 contains an operational amplifier 36 defining an inverting enter node 38, an output node 40 and a non-inverting input node forty two connected to ground. 46 samples the amplifier output sign at preamplifier output node 40 and provides a sequence of samples to each signal processing channel.
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While LED 16 is offering pink mild, the amplified sign obtained from preamplifier 34 is routed by means of switch 46 to crimson signal processing channel 48. Conversely, when infrared light is being emitted by diode 18, the amplified signal is routed to IR sign processing channel 50. During dark intervals, while neither diode is operative, the amplified output signal isn't routed to either sign processing channel. Each of signal processing channels forty eight and 50 might include usually standard components for changing the periodic signal samples supplied by switch 46 into a considerably continuous, smoothed signal, eliminating spurious parts resulting from the switching course of itself and figuring out the AC and DC components of the smoothed signal. 10 Hz, and is organized to attenuate alerts above that frequency. Fifty two is linked to each sign processing channels forty eight and 50, the microprocessor being arranged to receive digital values from the first and second analog to digital converter of each channel.
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