UV-Curing/Processing
UV curing is a process in which photocureable chemicals applied to substrates are irradiated with high energy UV or Visible radiation for curing. This energy accelerates polymerization (crosslinking) and consequently the hardening or drying process. The irradiated energy needs to be controlled, since too low a dose will not cure the product, whereas too high a dose will damage it.
In the curing application, dose is used describe the amount of energy delivered to the target product. It is defined as radiant exposure (energy per unit area) and typically measured as irradiance over time.
J/cm² = W/cm² x sHigh-power UV sources are used in this process. Because of non-linear ageing, UV output needs to be continuously monitored and controlled. These high UV levels place special demands on the measurement devices used in this application. Low profile detectors are required in this application due to the limited space inside an exposure frame or on a semiconductor stage. Some systems have the ability to expose the target from above and below requiring two separate measurements, two stacked detectors back-to-back or specially designed detectors that are able to view in both directions.
Since UV radiation is invisible to the human eye measurement with a good quality radiometer is the only way to know or monitor the output level for process control, dosimetry and also to assess health hazard risk. The UV radiometer should offer the functions and features required to fulfill the application requirements. The detector used in concert with the meter should be designed and configured to match the target application. A qualified UV broadband detector will offer:
- Coverage of the required spectral range with the appropriate spectral shape and minimal response outside this zone
- The proper measurement geometry for the quantity under test
- Good stability under long term use
- Calibration in the appropriate units with calibration correction to a specific source for added accuracy when required
Gigahertz-Optik offers irradiance detectors (RCH Series) specially designed for hostile ambient conditions involving high intensity irradiation and high temperature (up to 100°C). The detectors consist of two separate main components: the passive RADIN element which is exposed and the detector.
Additional information from our Products section:
High Intensity/Temperature Irradiance Light Detector: RCH Series Irradiance Detectors
Possible Optometer: X9 2, P-9710
Additional information from our Tutorials section: VI.4. UV Curing and UV Processing
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