The black fruit makes them look like Blackberries, though this is only superficial, with the taste being unique and not like either red raspberry or blackberry. In much of the Mid-Atlantic United States, black raspberries are simply called Blackberries, even though they are not. Hybrids between red and black raspberries are common under the name purple raspberries; âBrandywineâ, âRoyaltyâ and âEstateâ are examples of purple raspberry cultivars.
In the finger is an artery which carries the blood the pulse oximeter is interested in and a vein through which the blood leaves the finger. Below the finger is the light detector. Physical property No.1 : Amount of light absorbed is proportional to the concentration of the light absorbing substance
Oxyhaemoglobin absorbs more infrared light than deoxyhaemoglobin. Pulse oximeter: This shines light through a finger which is detected on the other side of the probe. It typically shines red light (wavelength 660nm) and infrared light (940nm) separated by a brief pause, multiple times per second. Processing: Light shone through the finger is detected on the other side.