Shin Dong-Joo, Park Seongchong, Jeong Ki-Lyong, Lee Dong-Hoon
Appl Opt. 2019 Oct 20;58(30):8262-8271. doi: 10.1364/AO.58.008262.
We present the design of a radiometer that can simultaneously measure both centroid wavelength and irradiance of a light source without recording its spectrum, when the light source has a finite spectral bandwidth. It consists of two photodiodes separated with a beam splitter in its basic construction, which can be referred to as a dual-photodiode radiometer. This radiometer is calibrated by measuring the spectral responsivities of two photodiodes against the spectral irradiance at the input aperture. The concept of the simultaneous measurement is valid under the condition that the spectral responsivities are linear against wavelengths within the spectral bandwidth of the source to be tested. The feasibility and expected accuracy are analyzed by numerical simulations and experimentally tested for the realization of a UVA irradiance meter, which shows an agreement within 0.2 nm and 0.6% for centroid wavelength and irradiance, respectively, with other reference instruments.
我们展示了一种辐射计的设计，当光源具有有限的光谱带宽时，该辐射计无需记录光源光谱即可同时测量其质心波长和辐照度。其基本结构由两个通过分束器分开的光电二极管组成，可称为双光电二极管辐射计。通过测量两个光电二极管相对于输入孔径处光谱辐照度的光谱响应率来校准该辐射计。同时测量的概念在以下条件下有效：光谱响应率在待测光源的光谱带宽内相对于波长呈线性关系。通过数值模拟分析了该方法的可行性和预期精度，并通过实验测试实现了一台UVA辐照度计，该辐照度计在质心波长和辐照度方面分别与其他参考仪器的测量结果在0.2 nm和0.6%的范围内一致。
