What is near IR fluorescence?
Near-infrared (NIR) fluorescence is a light wavelength of 650–950 nm, and is generally preferred for in vivo fluorescence imaging because of its good tissue penetration and low autofluorescence from adjacent tissues.
What is meant by near infrared?
: of or relating to the shorter wavelengths of radiation in the infrared spectrum and especially to those between 0.7 and 2.5 micrometers.
What does NIR do?
NIR is an acronym for Near InfraRed spectroscopy, and it refers to the analytical technique of using near-infrared radiation to analyze samples for compositional or characteristic traits. NIR has also been used to describe Near-Infrared Reflectance.
How does near infrared fluorescence imaging work?
NIR fluorescence imaging and tomography involves administration of a fluorescent contrast agent that (i) can be excited at wavelengths of 780 nm or greater, and (ii) has a significant Stoke’s shift emitting fluorescence at wavelengths of 800 nm or greater.
What are the types of infrared?
Infrared is usually divided into 3 spectral regions: near, mid and far-infrared. The boundaries between the near, mid and far-infrared regions are not agreed upon and can vary.
What is an example of infrared radiation?
The heat that we feel from sunlight, a fire, a radiator or a warm sidewalk is infrared. Infrared light is even used to heat food sometimes – special lamps that emit thermal infrared waves are often used in fast food restaurants! Shorter, near infrared waves are not hot at all – in fact you cannot even feel them.
How does NIR?
In NIR spectroscopy, the unknown substance is illuminated with a broad-spectrum (many wavelengths or frequencies) of near infrared light, which can be absorbed, transmitted, reflected or scattered by the sample of interest. The illumination is typically in the wavelength range of 0.8 to 2.5 microns (800 to 2500nm).
How do NIR sensors work?
The NIR sensors are extremely sensitive instruments that are optimized to measure the absorbancies of samples at these specific wavelength regions. Shining light at these wavelengths causes the corresponding chemical bond to vibrate and absorb energy.
What kind of spectroscopic method is near infrared spectroscopy?
Near-infrared spectroscopy ( NIRS) is a spectroscopic method that uses the near-infrared region of the electromagnetic spectrum (from 780 nm to 2500 nm).
How does near infrared spectroscopy ( NIR ) work?
NIR instruments use infrared light to analyze materials. To explain how it works we will use an analogy to how we humans investigate objects we see, by looking at their colors. In the painting below we can see that the lemons are yellow wand the limes are green.
What is the near infrared spectrum of dichloromethane?
Near-IR absorption spectrum of dichloromethane showing complicated overlapping overtones of mid IR absorption features. Near-infrared spectroscopy (NIRS) is a spectroscopic method that uses the near-infrared region of the electromagnetic spectrum (from 780 nm to 2500 nm).
What kind of light emits infrared fluorescence?
In the case of infrared fluorescence, a beam of visible light generates an emission of infrared radiation. Infrared Fluorescence is observed in few rare minerals but also in a very common molecule, chlorophyll. Chlorophyll emits infrared fluorescence in the very near infrared.