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oem7110
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If I put a red fabric under the Sun, what can this fabric be filtered in term of light frequency spectrum?
Thanks in advance of any suggestions
Thanks in advance of any suggestions
Drakkith said:Are you asking the spectrum of light that passes through the cloth, reflects off of it, or what?
johnbbahm said:...A true red filter would reflect most of the red leaving the remaining spectrum.
davenn said:Another example... why do you think they use RED filters in front of IR receiver sensors ?
...so that the red end of the spectrum is passed and the rest of the spectrum is filtered out
thereby avoiding false triggering and reduced sensitivity of the IR sensor
Dave
davenn said:sorry I don't really understand your question
care to rephrase ?
Dave
oem7110 said:I am interested and would like to know more about why use RED filters in front of IR receiver sensors.
Does anyone have any suggestions?
Thanks everyone very much for any suggestions
davenn said:I gave the answer in post #6
Dave
oem7110 said:... and the reason to select IR instead of other spectrum on this receiver sensors device.
Thanks everyone very much for any suggestions
oem7110 said:... and the reason to select IR instead of other spectrum on this receiver sensors device.
Thanks everyone very much for any suggestions
davenn said:...so that the red end of the spectrum is passed and the rest of the spectrum is filtered out
Dave
oem7110 said:If I apply a red filter, are Infrared, Microwave and Radio passed? and are Gramma ray, X-ray, Ultraviolet, Visible filtered out?
oem7110 said:If I apply a red filter, are Infrared, Microwave and Radio passed? and are Gramma ray, X-ray, Ultraviolet, Visible filtered out?
Does anyone have any suggestions?
Thanks everyone very much for any suggestions
I understand Dave, I was thinking of type of red filter used in say HeNe laser safety glasses.davenn said:huh ??
you better reread optics 101 ;)
all my optical filters of various colours that I use in photography PASS the colour of the filter and STOP other colours
Another example... why do you think they use RED filters in front of IR receiver sensors ?
...so that the red end of the spectrum is passed and the rest of the spectrum is filtered out
thereby avoiding false triggering and reduced sensitivity of the IR sensor
Dave
Yes, red fabric can filter light to a certain extent. The color of an object is determined by the wavelengths of light it reflects. Red fabric absorbs most of the shorter wavelengths of light, allowing only red light to pass through.
Red fabric contains pigments that are specifically designed to absorb shorter wavelengths of light, such as blue and green. This is why it appears red to our eyes and why it can filter out most other colors of light.
No, not all red fabrics are created equal. The effectiveness of the filtering depends on the type of fabric and its thickness. Some fabrics may only filter out a small amount of light, while others may be more effective at blocking certain wavelengths.
Red fabric can filter out shorter wavelengths of light, including blue, green, and violet. It may also have some impact on yellow and orange light, but to a lesser extent. However, it will not be able to filter out longer wavelengths of light, such as red and infrared.
No, red fabric is not effective in blocking UV rays. UV rays have much shorter wavelengths than red light, so they will not be absorbed by the fabric. It is important to use fabrics specifically designed to block UV rays for protection against sun exposure.