说明：  这篇应用报告讨论了使用 MSP430FG437 微处理器（MCU）进行非侵入性光体积描记法设计，非侵入性光体积描记法又被称为脉搏血氧仪。脉搏血氧仪由一个外围探头结合 MCU在 LCD 显示屏上显示氧饱和度和脉搏率。在这项应用中，同样的传感器被用于心率监测和脉搏血氧监测。探头被放置在身体的周边地点比如指尖，耳垂或鼻子。探头包括两个发光二极管（LEDs），一个处于可见红光波谱（660nm），另一个处于红外波谱（940nm）。身体的含氧量先通过测量每一频率的光传输通过身体后的强度，再计算这两个强度间的比率得到。
(This application report discusses the use of MSP430FG437 microprocessors (MCUs) for non-invasive photoplethysmography design, non-invasive optical plethysmography is also known as pulse oximeter. The pulse oximeter consists of a peripheral probe in conjunction with the MCU showing the oxygen saturation and pulse rate on the LCD display. In this application, the same sensor is used for heart rate monitoring and pulse oximetry. The probe is placed in the surrounding area of the body such as the fingertips, earlobe or nose. The probe consists of two light-emitting diodes (LEDs), one in the visible red spectrum (660 nm) and the other at the infrared spectrum (940 nm). The oxygen content of the body is first measured by measuring the intensity of the light transmitted through each body through the intensity of the body and then calculating the ratio between the two intensities.)