NIRsäteilyllä

NIRsäteilyllä refers to near-infrared radiation. This is a portion of the electromagnetic spectrum with wavelengths longer than visible light but shorter than infrared light. The typical wavelength range for near-infrared radiation is from approximately 700 nanometers (nm) to 2,500 nm. It is invisible to the human eye, unlike visible light.

Near-infrared radiation has various applications due to its specific properties. In spectroscopy, it is used for analyzing the chemical composition of materials, as many organic molecules absorb strongly in this region. This technique, known as near-infrared spectroscopy (NIRS), finds use in fields such as food analysis, pharmaceuticals, and agriculture for quality control and identification.

In telecommunications, near-infrared light is employed in fiber optics for transmitting data. Its lower attenuation in optical fibers compared to visible light makes it suitable for long-distance communication.

Other applications include thermal imaging, where certain sensors can detect heat signatures by measuring emitted near-infrared radiation. It is also utilized in medical diagnostics, for example, in pulse oximetry to measure blood oxygen saturation, and in therapy for pain relief and tissue healing. The penetration depth of NIRsäteilyllä into biological tissues varies, making it useful for non-invasive monitoring and treatment.