Applications: low-output fluorescent sources for sterilization, high-intensity mercury or xenon lamps for curing, narrow-band LEDs for photolithography

The ILT800 UV radiometer allows users to track their curing processes over time by allowing them to store, download, and view both current and all previously saved readings on the device’s integrated OLED display. This built-in data storage and review feature enables users to quickly identify changes that have occurred over time. It also helps users to easily spot potential issues in their systems such as dirty lamps and reflectors, lamp/reflector misalignment, declining lamp output, failed lamps, and power supply problems, among others. Additional benefits include the ability to download the results to a computer for more detailed analysis. With ILT’s proprietary DataLight CureRight software interface, users can download and view their data, as well as generate spreadsheets and reports using their own analysis tools.

What you need to know for field of view is the camera sensor size (or film size) measured in mm. You must compute with sensor dimensions in mm.

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It's basic geometry: you have a right angle triangle, with half the FOV as one of the angles (a), and half your image size as the opposite side (A). To calculate the focal length F, use tan(a) = A/F, which gives F = A/tan(a).

To further enhance the data storage and capabilities, ILT introduced an advanced sorting feature called Device ID, a feature not found in any other UV curing light meter. Device ID allows users to program up to 20 unique system/light source name tags. Device ID enables users to view and export all saved data for each curing station or light source into separate files, clearly identified with the Device ID. It’s like having the functionality of multiple meters in a single device.

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The ILT800 CureRight is a UV curing radiometer that is packed with features, offering unparalleled flexibility and capabilities not found in any other system. Its adaptability enables the device to measure lights used for UV curing and a variety of other applications such as sterilization/disinfection, lithography, and more. The system is designed with the diverse needs of its users in mind and can be tailored to fit your specific environment.

As your sensor size is given in pixels (assumed square pixels!), your focal length will also be in pixels. To get it in a more usual unit (m), you need to know the pixel size.

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The ILT800 CureRight UV radiometer system surpasses competitors with features like standard profiling and programmable settings such as measurement modes (auto/manual/live), minimum light level threshold, and lamp-to-lamp measurement interval (delay). The system also boasts a unique user interface that places the input sensor and optic, device controls, and the readout display all on one side, facilitating simultaneous measurement, monitoring, and analysis of measurement data.

The ILT800’s spectral filtration was designed to match the photoinitiators’ response to UV light, which is directly related to its absorption and is highly wavelength selective. Most lamps emit broadband UV/VIS/IR, and the lamp’s output may not change evenly across all wavelengths. The ILT800 filters were designed to monitor changes in output in the areas that affect absorption, and consequently, the effectiveness of the curing. Whether you’re using a low-output fluorescent source for sterilization, high-intensity mercury or xenon lamps for curing, or narrow-band LEDs for photolithography, there’s a version of the ILT800 tailored for your needs.

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It is what Hermann said, focal length is NOT measured in pixels. I strongly doubt the engineering journal said focal length was pixels.

There is a calculator that will do this at https://www.scantips.com/lights/fieldofview.html (Option 6). The geometry is shown at bottom of that page, however, you must use Trig for angles.

The ILT800 CureRight series validates and measures all kinds of UV curing methods and sources, including conveyor, belt, oven, flood, area, spot, fiber optic, collimated beam, side cure, 180° curing, 3D printing, pulsed and traditional UV lamps, and UV/VIS LEDs & light sources.

The triangles (large and small) are similar, that is angles are the same. So Angle of view will be the same as top angle (at the lens) of the smaller triangle. From that, since you know what sensor size and angle of view is, you can calculate focal length in pixels, as @remco calculated for you.

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In fact, units of the sensor size should be exactly the same as units of the focal length to make sense of F=A/tan(a). What you can get from that is, if you have bigger pixels (in cm), you will need larger focal length (in cm) for same field of view and number of pixels.

The article specifies that the horizontal FOV is 47°, so we have to use A = 640/2 = 320, a = 47°/2 = 23.5°, which give F = 736 pixels.