近年來受到環境保育、地球暖化以及各國民眾環保意識抬頭的影響，各國的能源政策逐漸從傳統的石化燃料轉為乾淨的風能發電以及太陽光能發電，而根據經濟部能源局再生能源資訊網報告之全球再生能源中，以太陽光電為主的裝置容量自2016年至2017年間從303GW(Giga Watt)提升至402GW，2017年較2016年共提升了32.67%，得見以太陽光能為主的乾淨能源正蓬勃發展。
本研究之定日鏡基於幾何光學中入射角等於反射角的基礎概念，將太陽視為點光源而抵達地球的太陽光為平行光，利用一面反射鏡將陽光反射至集光器上，其反射鏡為定日鏡中的光學元件，並且透過一自行開發之定日鏡系統將太陽位置以及集光器GPS位置計算後求出反射角，相較於傳統靜態式集光器，本研究中使用多個自動定日鏡做為前集光單元，可以有效的提升集光器的光學效率並且將傳統靜態集光器有效集光時間約2小時拉長至8~10小時，更穩定的為自然光照明系統集光單元提供陽光。

In recent years, due to the impact of environmental conservation, global warming and the rise of environmental awareness among people in various countries, countries' energy policies have gradually shifted from traditional fossil fuels to clean wind power generation and solar power generation, according to the Ministry of Economic Affairs Energy Bureau renewable energy information. Among the global renewable energy sources reported by the network, the solar photovoltaic-based device capacity has increased from 303 GW (Giga Watt) to 402 GW from 2016 to 2017, and has increased by 32.67% in 2016 compared with 2016. The clean energy is booming.
The heliostat of this study is based on the basic concept that the incident angle is equal to the angle of reflection in geometric optics. The sun is regarded as a point source and the sunlight reaching the earth is parallel light. A mirror is used to reflect sunlight onto the concentrator, and its reflection is reflected. The mirror is an optical component in the heliostat, and the solar position and the GPS position of the concentrator are calculated by a self-developed heliostat system to obtain a reflection angle, which is used in this study compared to the conventional static concentrator. As one of the front light collecting units, a plurality of automatic heliostats can effectively improve the optical efficiency of the concentrator and extend the effective concentrating time of the conventional static concentrator to about 8 to 10 hours, which is more stable for natural light. The lighting system light collection unit provides sunlight.

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