"Proven durability of optical thin film filters with outdoor exposure for 2 years and shift amount within ±2nm!" has been added as a technical trend keyword.
When selecting optical thin film filters, many engineers and purchasing personnel first check the "initial performance" such as the spectral transmittance curve and half-width. However, when incorporating them into outdoor equipment or sensor modules, what we really want to know is whether "that performance is maintained after one year or two years." Ultraviolet light, temperature and humidity cycles, rainwater, and dust in the atmosphere—these complex stresses cannot be fully replicated by accelerated testing using constant temperature and humidity chambers or UV exposure test machines. While accelerated tests have the advantage of providing results in a short period, they face the challenge of not being able to provide a definitive answer to the question of "what will happen in actual outdoor environments." Therefore, Adachi New Industry Co., Ltd. conducted an exposure test by installing optical thin film filters outdoors on its rooftop for a full two years to track the temporal changes in optical characteristics. This time, we are specially releasing a portion of the test results and will introduce practical insights that can be gleaned from them.
[1] Overview of the test
[2] Test results
[3] Two trends visible from the data
[4] What these results mean: Considering by application
Summary
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