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Calculating the cost of heating does not require any advanced math so why not find out what the Wattage required to heatup your space. More than 20 years ago a couple from Prague fell in love with the nature of the Jizera Mountains. The electromagnetic spectrum includes the entire range of radiations, which are measured either as waves or frequencies.
Infrared energy is invisible to the human eye but it is possible to observe it with special cameras which convert heat into visible light colours. Thermal therapy has in fact been employed for hudreds of years for the purposes of improving one’s mental and physical health.
The positive effect of the infrared rays on human health has been documented in quite a detail, and as the infrared therapy keeps growing in popularity, more and more studies are being conducted and published. This lab relies on an oddity of the light sensors used in digital cameras, which are either CCD or CMOS detectors. Light detection efficiencies of CCD and CMOS compared to the three types of cone cells (red, green, blue) in the human eye. Experiment with the orientations of the grating (or prism) and projector (or paper) until the rainbow projects onto the screen. Plant leaves appear very bright in infrared (remember the ALTA spectrometer lab?), and that shows up nicely. To understand how laser action occurs, one must first consider the atomic nature of matter. The stimulating radiation in a laser is provided as a result of feedback within a resonant optical cavity. This class of laser is eye safe when used without optical instruments but may not be safe if optical instruments are used. This class of laser is eye safe as a result of normal human aversion responses, including the blink reflex.
Podlesak spends up to 14 hours at the computer dealing with hundreds of thousands of figures every day. However, direct exploitation of this energy for body warming has been made possible not that long ago, by modern technology. Regardless of the ongoing discussion regarding the various advantages of infrared heating, its health and economical benefits have been proven beyond doubt. You and your students will ‘see' infrared light, normally invisible to the human eye, as a continuation of the visible rainbow spectrum. Both kinds are sensitive to visible light (which is why they are used), but are even more sensitive to infrared light near the visible spectrum (see graph).
With a diffraction grating, you may need to rotate it (around a horizontal axis) until the rainbow spreads out horizontally. Slit in cardboard on overhead projector lets a beam of light through to the diffraction grating (held by Tori).


The point here is to compare what your students see with what the modified webcam registers. Julie's finger on the rainbow spectrum, same scene as above, but viewed through the modified webcam.
You can do about a million things with the IR-enabled webcam — basically any exercise that involves observing light. The dye laser is an example of a liquid laser, while probably the most common gas laser is the CO2. These limits indicate the class of the laser and are listed in EN 60825-1 and the American National Standard ANSI Z136.1 for the safe use of lasers. The radiation is a maximum of 5 x AEL of class 1 (invisible) or 5 x AEL of class 2 (visible). This warmth comes from the infrared rays which penetrate your body sometimes as deep as several centimetres below the skin.
You can text this yourself if you hold your palms close together but without letting them touch: Feel the sensation?
In the start, they used it in Germany in the first half of the 20th century, and for the last 40 years is has been quite actively cultivated and researched by doctors and therapists in Japan.
So, for a CCD or CMOS camera to match what a human sees, all of the infrared light (wavelengths longer than 700 nanometers) must be removed with a filter. With a prism, hold it so its faces are vertical, and rotate it (around its vertical axis) until a rainbow forms somewhere in the room. As we did in the workshop, it is nice to be able to project the webcam image on a screen next to the spectrum.
All the red, pink, and white to the left of her finger is infrared light, detected by the modified webcam but invisible to humans.
You can see that the IR part of the spectrum, leftward of about the middle of the red, is about the same length as the visible part of the spectrum. The AEL values for the laser classes are derived from the medical MPE (Maximum Permissible Exposure) values.
Department of the InteriorThe Greenhouse Effect is the process by which an atmosphere holds heat around a planet. Clearly infrared is safe, friendly and efficient due to its ability to directly heat up objects and not the surrounding air. Palm healing, whose origins go some 3,000 years back to ancient China, is founded on the inherent healing qualities of the infrared energy. As far as Europe and the United States go, the method became recognized as the infrared therapy shortly after year 1980. Modified webcam, the round ball with cord, sits in a convenient place and is aimed at the rainbow.
From this photo, it is clear that the camera is sensitive to light further left (longer wavelengths) than Julie (or I) can see.


This shows that the invisible IR part of this rainbow is about as big a range of wavelengths (1000–700 nanometers) as the visible part (400–700 namometers). For the purpose of classifying their hazards within the laser safety standards, pulsed lasers are placed into different groups depending upon the length of their optical pulses.
The MPE values specify the danger level for the eye or the skin with respect to the laser radiation. The story of how this works begins with a discussion of light.The light that we can see with our eyes is just a small part of the full spectrum of light that occurs in nature.
We call this the electromagnetic spectrum because light is a composite of interacting electric and magnetic force fields. It is, however, important not to mix them up with ultraviolet rays, which are, on the contrary, harmful. The spectrum extends from low energy microwaves and infrared light to the visible part of the spectrum (red, orange, yellow, green, blue, and violet), and then to more energetic forms of light such as ultraviolet and x-rays.Adapted from NASA diagram. Click to enlarge.It turns out that all objects with a temperature above absolute zero radiate light. The surface of the Earth has an average temperature of 60 degrees Fahrenheit (288 degrees Kelvin), so it radiates in the infrared part of the spectrum. For the Earth, the incoming energy is the absorbed light from the Sun, and the outgoing energy is the infrared light the Earth radiates out to space. But the greenhouse gas molecules absorb the infrared light, and then re-radiate some of it back to the Earth's surface.
This makes the surface hotter so it radiates more light, thus establishing an equilibrium at a higher temperature. This process is known as the Greenhouse Effect.The Greenhouse Effect can be proven in many different ways.
Mars is very cold, has no appreciable atmosphere, and its temperature can be explained without invoking a Greenhouse Effect. The problem of global warming has arisen because humans are artificially increasing the concentration of greenhouse gases in the atmosphere.
We do need some blanket over us or we'd freeze to death, but when the blanket gets too thick, we also have a problem. Excess greenhouse gas emissions and deforestation are starting to make our blanket dangerously too thick.



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