What is the difference between ultraviolet photography and infrared photography?

What is the difference between ultraviolet photography and infrared photography?

Ultraviolet wavelengths are shorter than 400nm and infrared wavelengths are longer than 700nm. They provide us with no visual response and therefore are not considered to be light. Certain narrow bands of this invisible radiation, however, have practical photographic applications.

What is are the significance of ultraviolet and infrared photography in forensics?

UV technology can also be used to scan a body or a crime scene for evidence not detectable by the naked eye. A video intensifier tube, which is sensitive to light waves from the UV spectrum through the infrared, can be modified to detect only UV light waves.

Where are ultraviolet and infrared lights used in forensic photography?

Examples of some of the types of evidence that can be photographed with infrared and ultraviolet light include: latent footwear impressions. fingerprints. body fluids including blood.

How are ultraviolet rays used in photography?

In reflected UV photography the subject is illuminated directly by UV emitting lamps (radiation sources) or by strong sunlight. A UV transmitting filter is placed on the lens, which allows ultraviolet radiation to pass and which absorbs or blocks all light and infrared radiation.

How do UV waves affect objects and people?

Unlike X-rays, ultraviolet radiation has a low power of penetration; hence, its direct effects on the human body are limited to the surface skin. The direct effects include reddening of the skin (sunburn), pigmentation development (suntan), aging, and carcinogenic changes.

What are the uses of infrared photography in law enforcement?

Law Enforcement Police forces and members of the public can use infrared photography for crime prevention and security purposes. Because infrared cameras have the capability to record in complete darkness, they are very useful for surveillance purposes.

How are infrared photography useful?

As traditional photography techniques were incorporated into documenting crime scene investigations, the use of infrared photography also proved to be useful for documenting and making visible subjects that would otherwise not be visible subjects that would otherwise not be readily visible to the naked eye.

What do forensic scientists use UV photography for?

Ultraviolet (UV) light technologies are used for multiple purposes in forensic investigations, including authenticating paintings and other fine art, authenticating signatures, analyzing questioned documents , illuminating latent fingerprints at crime scenes and trace evidence on clothing, analyzing ink stains, and …

How can infrared photography be useful in the in conducting crime scene investigation?

What is infrared light in photography?

Infrared photography refers to a special type of photography using films or sensors that have infrared light sensitivity. By using infrared light in a photograph one can add special effects, like false colors, to photographs.

What are the effects of visible light on humans?

The visible light radiation can exert various biologic effects such as erythema, pigmentation, thermal damage and free radical production. Addtionally, visible light exposure can cause or exacerbate photodermatoses such as solar urticaria, chronic actinic dermatosis (CAD) and cutaneous porphyrias.

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