Contents
Source: Power Technology, Inc.
Understanding Infrared Viewers in Laboratories
Introduction to Infrared Viewers
In laboratory settings, dealing with infrared light, such as beams emitted by lasers, can present challenges in visualizing beam paths or positions without visual aids. Infrared viewers (IR viewers) serve as devices that make infrared light visible to the human eye. Unlike infrared cameras, IR viewers do not typically have video output or recording capabilities.
Operation Principle
Common IR viewers work by imaging incoming infrared light onto a photoconverter inside an evacuated tube. The photoelectrons generated by the incident radiation hit a phosphor, causing it to emit visible light, creating an image. This visible image is then transmitted through the ocular lens for viewing.
Observing Laser Beams and Optical Fibers
IR viewers allow observation of laser beams that enter the device, and scattered light from beams hitting surfaces like white cards. In optical fibers, light can be observed through scattering within the core or interfaces. Active fibers may exhibit fluorescence from laser-active ions.
Spectral Response and Sensitivity
IR viewers have varying sensitivity within specified wavelength ranges. The spectral response of the viewer determines its usability for specific applications. Sensitivity to visible light allows for enhanced viewing under normal lighting conditions.
Features and Practical Considerations
IR viewers are usually handheld, battery-operated devices, offering portability and ease of use. They provide limited image quality compared to visible light cameras, with potential distortions and nonlinear responses. Additional filters and lenses can be attached to improve viewing capabilities.
Applications and Alternatives
Infrared sensor cards offer a cost-effective alternative to IR viewers for basic beam path visualization. While IR viewers are commonly used in laboratories, they lack binocular capabilities and are designed for single-eye use.
Conclusion
Infrared viewers play a crucial role in visualizing infrared light in laboratory environments, offering a practical solution for locating and observing infrared beams. Understanding their operation principles and limitations can help optimize their use in various applications.
Source: IR-Viewers
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