New procedure for direct measurements of absorbance of thin films of ultra-high absorbance UV blocks

Norman D. McMillan; A. Solsvik; L. Murphy; A. Stevenson; M. O'Neill; J. Moore

doi:10.1117/12.629159

8 June 2005 New procedure for direct measurements of absorbance of thin films of ultra-high absorbance UV blocks

Norman D. McMillan, A. Solsvik, L. Murphy, A. Stevenson, M. O'Neill, J. Moore

Proceedings Volume 5827, Opto-Ireland 2005: Photonic Engineering; (2005) https://doi.org/10.1117/12.629159
Event: OPTO-Ireland, 2005, Dublin, Ireland

Abstract

A novel method for the measurement of ultra-high absorbance liquids has been devised and details are given of a new ultra absorbance instrument developed specifically for these thin liquid film measurements. The instrument specifically constructed for monitoring and measuring sunscreen products has been tested using locally produced sunscreen products. This new approach has been made possible by the development of very accurate liquid micro-dispensers and details are given of the novel procedure to carry out these measurements. Detailed description of the apparatus construction is given with photographs of the apparatus. The work described is largely based on research and quality control measurements of Parasol suncare products. Results on the reproducibility of measurements taken with the UAI for a commercial range of factor 20 sunscreen liquid are given and these have been used to validate the performance of the instrument. It is believed that the absorbance measurements described here are perhaps the largest ever reported. In addition, the photostability of this product has been monitored in aging tests. Finally, some studies have been done on two other commercially available factor 20 products that show that these are significantly worse with regards to both protection from ageing and burn.

Citation Download Citation

Norman D. McMillan, A. Solsvik, L. Murphy, A. Stevenson, M. O'Neill, and J. Moore "New procedure for direct measurements of absorbance of thin films of ultra-high absorbance UV blocks", Proc. SPIE 5827, Opto-Ireland 2005: Photonic Engineering, (8 June 2005); https://doi.org/10.1117/12.629159

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