OHR Technology

Optical Heart Rate (OHR) sensors use a methodology called Photoplethysmogram (PPG) to measure heart rate. PPG is a technical term for shining light into the skin and measuring the amount of light that is scattered by blood flow. Light entering the skin will disperse in a predictable manner as the blood flow dynamics change, such as with changes in blood pulse rates (heart rate) or with changes in blood volume (cardiac output). 

PPG uses four primary technical components to measure heart rate:

1. Optical Emitter
Generally made up of at least 2~4 LED's that send light into the skin. At Stand Best we try to deliver our products as universally as possible, hence integrating multiple light wavelengths that interact differently with different levels of skin and tissue, making it compatible with a wide range of skin tone and thickness. 

2. Digital Signal Processor (DSP)
The DSP captures the light refracted from the user and translates the signlas into digital codes (one's and zero's) that can be calculated into meaningful heart rate data.

3. Accelerometer
The accelerometer measures motion and is used in a combination with the DSP signal leading to PPG algorithms.

4. Algorithms
The algorithms process the signals from the DSP and the accelerometer motion data. Biometrics such as VO2, calories burned, heart rate variability and even blood pressure can be calculated additionally. 

The photodiode and LED's are on the same side, collecting light reflected from the blood in the arteries, veins and skin tissue from various depths. The blood flowing in the arteries is pulsatile which enables changes in the reflected light, therefore allows reading the instantaneous heartbeat of the person.

Leading PPG Technologies in our Products

Our Professional Heart Rate Monitor