UV LED（紫外 LED）测量专用系统

UV LED测量专用系统

技术挑战

在led的发展过程中，经常需要测量其光谱通量。某客户需要测试一系列具有高紫外光输出的led光源。他们需要蓝菲光学（Labsphere）提供一个可靠的、可重复使用的光测量系统。

紫外LED测试专用系统-蓝菲光学

蓝菲光学（Labsphere）的解决方案

测量高紫外光源非常复杂，因此需要比一般光测量更加先进的系统；最重要的是，测试系统所选用的材料需要坚固耐用，并且能够承受高紫外线光的辐射。蓝菲光学（Labsphere）标准光学级Spectralon材料在大量的紫外线辐射下反射率会下降。最终，我们给客户提供了一个12英寸的光测量积分球，具有以下独特的功能特点:

·                内部嵌套耐真空和极端环境（EPV）Spectralon材料

·                通过光纤连接分光辐射计

·                辅助灯和校准灯接口

·                自定义3.5”光阱，用于校准使用

·                通过滑动，锁定安装在框架上

·                带有用于氮气净化的两个正对的端口

由于短波紫外线(波长小于200nm)会被大气中的氧分子吸收，为此我们需要在积分球内创造一个低氧环境，这可以通过氮气净化来得到。通过进气口和出气口控制氮气在球体的流动。Labsphere并没有选择其他材料，而是对Spectralon衬里进行真空烘焙，并将其在一个10000级洁净度的超净室内进行组装。这一过程清除了材料中的任何分子级污染物，并有助于防止球体内部材料反射率下降，最终在较长时间内提供更准确的结果。

优点

Ø  EPV Spectralon衬里使系统具有有更长的寿命：允许客户在更长的时间内依靠该系统获得准确的结果

Ø  最大限度地减少重复的更换成本

Ø  氮气净化过程减少了误差，扩大了可测量波长的范围，提高了测试效率。

Ø  该系统高度易于调节，便于更换DUTs和安装光阱等附件。

Ø  通过光阱使系统标定简单、准确。

Application-Specific System for UV LED Measurements

Technical Challenge

In the process of the development of LEDs, it is often necessary to measure their spectral flux. A client needed to test a series of LEDs that had a high UV light output. They asked Labsphere for a reliable, reusable light measurement system.

Labsphere’s Solution

Measuring lights with substantial UV intensity creates several complications that require a more advanced system than is usually required; most importantly, the material needs to be robust and able to withstand high UV content. Labsphere’s standard Optical Grade Spectralon material can suffer reflectance degradation when exposed to abundant UV radiation. The final product was a 12-inch light measurement sphere with several application-specific features:

·                Interior Extreme Physics and Vacuum (EPV) Spectralon lining

·                Fiber optic connector leading into a spectroradiometer

·                Auxiliary lamp and calibration lamp port

·                Custom 3.5” light trap for use during calibration

·                Sliding, lockable mounts on frame

·                Two small, antipodal ports to be used for nitrogen purging

Shorter UV wavelengths (less than 200nm) are absorbed by oxygen molecules in the atmosphere. This can be prevented with nitrogen purging, which creates a low-oxygen environment within the sphere. The inlet and outlet ports controlled the nitrogen flow to the sphere. Rather than choosing a different material, Labsphere vacuum-baked the Spectralon lining and assembled the sphere in a class 10,000 clean room. This process cleansed the material of any molecular contaminants and helped prevent reflectance degradation of the sphere’s interior, ultimately providing more accurate results over a longer period of time.

Benefits

Ø    The EPV Spectralon interior gives the system a longer performance lifetime: Allows the client to rely on the system for accurate results over an extended period of time

Ø    Minimizes recurring replacement costs

Ø    The nitrogen purging process reduces inaccuracies and widens the range of measurable wavelengths, improving testing efficacy.

Ø    Height of the system is easily adjustable, facilitating the process of exchanging DUTs and installing the light trap attachment.

Ø    The light trap makes calibrating the system easy and accurate.