OD value of laser protection windows and glasses are the standard by which to compare the performance of laser safety goggles or windows. OD value of laser protection windows and glasses can detail the loss of light energy due to transmission exposure (spectral region). OD value of laser protection windows and glasses can indicate that the higher the performance of the black aluminum plate, the higher the test data, that is, the better protection of human eyes from the hazards of laser radiation. The following is a detailed introduction to the understanding of OD value.
The protective effect of laser goggles and windows will increase with the increase of the protective spectrum (wavelength) of the protective glasses, so the higher the OD value, the better the protective effect. Likewise, at a specific wavelength, the higher the OD value, the better the protection. OD values are calculated using a log-log curve (LD), which more accurately describes the performance of laser goggles and windows through exposure.
OD value calculation method:
OD (Optical Density), also known as optical density, is the transmittance ratio of laser protective glasses or windows. The calculation method of OD value is:
OD = -log(T)
Among them, T is the transmittance ratio, that is, the ratio of the light intensity passing through the protective glass or window to the light intensity emitted from the protective glass or window. In the field of laser safety protection, the higher the OD value, the better the protection effect. For example, when working with laser beams, protective glasses with high optical density can filter out harmful light scattering and reflections, protecting the user's vision from damage.
Optical Density (OD)
|Transmittance||Decay Rate||Protection Function|
How to choose an appropriate OD value?
The higher the OD value, the stronger the protection ability, but too high OD value will directly reflect the strong laser beam, causing damage to human eyes. Therefore, it is very important to choose an appropriate OD value. For pulsed lasers, it is generally recommended to choose an OD value of 10-15. For continuous lasers, it is generally recommended to choose an OD value of 4-6. In addition, when choosing laser protective glasses, factors such as the wavelength and power of the laser should also be considered. If you are not sure enough to determine the required OD value, it is best to consult an experienced technician or a professional laser safety protection company.
In short, the OD value is an important index to describe the performance of laser protective glasses and windows. The higher the OD value, the better the protective performance. When selecting suitable protective glasses or protective windows, it is necessary to comprehensively consider multiple factors such as wavelength and power in order to select a suitable OD value to protect the safety of workers.
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