Overall Optical Design of LED Surgical Luminaires of Variable Light Spot
Shikang Zhou,
Chungen Chen
Issue:
Volume 8, Issue 1, June 2019
Pages:
1-6
Received:
17 December 2018
Accepted:
22 January 2019
Published:
21 February 2019
Abstract: The surgical luminaires play a very important role in surgical operation and diagnostics. Its overall optical design is the most important component in the design of the surgical luminaires. The wide variable range of the spot size makes the luminaires adaptable to multiple occasions, and the variability is an important indicator for high-grade surgical luminaires. However, it is difficult to keep the uniformity of illumination when the size of the light field changes. One of the reasons why there are few new surgical lamps with wide range of spot size variation in the market is the lack of theoretical analysis. In this paper, we analyze the relationship between the optics of surgical luminaries and the variable light spot by examining a hypothetical surgical lamp composed of 7 LEDs, 6 of which can move radially to create the total spot variable. An improved multivariate Gaussian function will be used to simulate the variable illumination field. Several important optical parameters describing the light field in IEC standard are carefully selected as the independent variables of the Gaussian function. By adding seven improved Gaussian functions of single-spot, a mathematical function of all-spot illumination distribution is established. By this way, it is easy to find in what manner the illumination distribution of surgical luminaires varies with independent variables under the condition of meeting the requirements of international standards. From the calculated results, the important parameters for overall optical design are determined, such as the illumination distribution, the amount of spot movement, the maximum variation range of the light field and the uniformity of illumination. The graphical representation of the results are also given in this paper. The original calculations provided in this article can be used in overall optical design of surgical luminaires with any range of light field change.
Abstract: The surgical luminaires play a very important role in surgical operation and diagnostics. Its overall optical design is the most important component in the design of the surgical luminaires. The wide variable range of the spot size makes the luminaires adaptable to multiple occasions, and the variability is an important indicator for high-grade sur...
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