OSA: Measurement of Visible Light Devices for Medical Equipment
A pulse oximeter is a medical measuring instrument that measures oxygen saturation in blood without collecting blood. Oxygen saturation is measured using the difference in the absorption characteristics of HbO2 (oxyhemoglobin) and Hb (reduced hemoglobin) in blood. Two LEDs with wavelengths of 665 nm and 880 nm are used for this measurement. Since the absorption characteristics of HbO2 and Hb change greatly depending on the wavelength, a LED with a high wavelength accuracy of about ± 0.5 nm is required for accurate measurement of oxygen saturation. The measurement wavelength range and high wavelength accuracy of the applicable models are suitable for measuring LEDs for pulse oximeters.
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Source: Konica Minolta website |
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Source: Konica Minolta website |
Laser treatment devices use lasers with different wavelengths depending on the treatment target. The laser requires the singularity in wavelength so that it does not affect other parts than the target.
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Lasers |
Wavelength |
Applications |
|---|---|---|
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Nd:YAG laser |
1064 nm |
Tattoos, keloids, acne, wrinkles |
|
Laser diode |
800 nm |
Epilation, surgery, allergic rhinitis |
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Alexandrite laser |
755 nm |
Macule, bruise, epilation |
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Ruby laser |
694 nm |
Macule, bruises, moles |
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Dye laser |
585 nm |
Red bruise, vascular disease |
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Nd:YAG (SHG) |
532 nm |
Macule, freckles, red bruise |
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Laser diode |
532 nm |
Telangiectasia, hay fever |
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