Chun-Han Chou

Innovative light collimator with afocal lens and total internal reflection lens for daylighting system.

This research presents a novel design of the collimator, which uses total internal reflection (TIR), convex, and concave lenses for the natural light illumination system (NLIS). The concept of the NLIS is to illuminate building interiors with natural light, which saves energy consumption. The TIR lens is used to collimate the light, and convex and concave lenses are used to converge the light to the required area. The results have shown that the efficiency in terms of achieving collimated light using the proposed collimator at the output of the light collector is better than that of a previous system without a collimator.

Innovative design of light collimator based on a freeform microlens array

This study presents an innovative freeform lens used in the NLIS (Natural Light Illumination System). The NLIS is used to guide the natural light indoors for illumination, which system is implemented in energy saving smart buildings to reduce energy consumption. The freeform lens is based on microlens array to collimate the light from the collecting sub-system before entering the light transmitting sub-system. Results show better parallelism can be achieved for later light transmission.

Design of a Light Guide for Highly Uniform Illumination

In this article, we propose a design for a light guide for highly uniform illumination. The design is based on a refractive equation and the law of conservation of energy. We applied these principles to design the secondary optics lens. The methods used can be utilized to quickly design a lens with high uniformity. Finally, we obtain a Fresnel lens for illumination with a uniformity of around 92 %.

Freeform microstructure linear light emitter design for a natural light illumination system

The major factors of an illuminative environment are a high rendering index and uniformity. The natural light illumination system (NLIS) is used to guide sunlight for indoor illumination. The NLIS consists of three subsystems: collecting, transmitting, and emitting. Nowadays, a variety of light emitters are available for different illuminative environments. This paper proposes a linear microstructure to diffuse parallel light for indoor illumination. To increase uniformity and promote the illuminative area, the light emitter includes two microstructures for the distribution of light. Finally, the proposed light emitter gives illuminance uniformity and efficiency of 0.55% and 74.18%, respectively.

A freeform reflecting coupler for the Natural Light Illumination System

This paper represents the design of a freeform reflector coupler which reduces the amount of light guides and has a high efficiency of the optical coupler used in the NLIS (Natural Light Illumination System). The NLIS is used to guide the natural light indoors for illumination, which system is implemented in energy saving smart buildings to reduce energy consumption. This optical structure has a freeform reflector and the efficiency of light reflected by freeform reflector to light guide is 93%.

An innovative modular coupler design for sunlight illumination

This paper presents a coupler which increases the efficiency for the NLIS (Natural light illumination system). The NLIS is a novel illumination system that can provide the eco-friendly illumination for the smart building for protecting the global environment.

A tunable light distributor for Natural Lighting application

The purpose of Natural Light Illumination System (NLIS) is to provide people a comfort and health indoor illumination by directing sunlight into indoor from the light collector. The NLIS is composed of three sub-systems, light collection, light transmission and light emission. Although we can use the high efficiency light pipe to transmit the light in the NLIS. However, once the light transmission path of the light pipe encounters the reflection corner, the efficiency and the candela distribution of the light will decrease and change. Therefore, we design a tunable light distributor installed between the light transmit and light emit sub-system in this paper.

Design the lighting concentrator coupler for daylight illumination

In developing a high-quality natural light illumination system, the primary concern is to increase system efficiencys. This paper describes a new static lighting concentrator with the optical couplers. The new coupler not only increases the efficiency but also reduces the numbers of output ports. The structure consists of two-layered units, planar light guide, and a central coupler to compress sunlight and improve light transmission efficiency.