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Light Measurement Handbook phần 5

Nguồn xả thải ra một lượng lớn bức xạ đặc biệt dòng quang phổ nguyên tử, ngoài một sự liên tục, liên tục dựa trên nhiệt. Cách chính xác nhất để miêu tả những khía cạnh trên cùng một đồ thị là một âm mưu trục kép, thể hiện trong hình 9.1. Các vạch quang phổ được vẽ đồ thị trên một trục bức xạ (W/cm2) và liên tục là vẽ đồ thị trên trục băng tần (W/cm2/nm) bức xạ. Các dòng phổ đi trên đầu trang của các liên tục. . | Light Measurement Handbook 1998 by Alex Ryer International Light Inc. 9 Graphing Data Line Sources Discharge sources emit large amounts of irradiance at particular atomic spectral lines in addition to a constant thermal based continuum. The most accurate way to portray both of these aspects on the same graph is with a dual axis plot shown in figure 9.1. The spectral lines are graphed on an irradiance axis W cm2 and the continuum is graphed on a band irradiance W cm2 nm axis. The spectral lines ride on top of the continuum. Another useful way to graph mixed sources is to plot spectral lines as a rectangle the width of the monochromator bandwidth. see fig. 5.5 This provides a good visual indication of the relative amount of power contributed by the spectral lines in relation to the continuum with the power being bandwidth times magnitude. 41 Light Measurement Handbook 1998 by Alex Ryer International Light Inc. Polar Spatial Plots The best way to represent the responsivity of a detector with respect to incident angle of light is by graphing it in Polar Coordinates. The polar plot in figure 9.2 shows three curves A power response such as a laser beam underfilling a detector a cosine response irradiance overfilling a detector and a high gain response the effect of using a telescopic lens . This method of graphing is desirable because it is easy to understand visually. Angles are portrayed as angles and responsivity is portrayed radially in linear graduations. The power response curve clearly shows that the response between -60 and 60 degrees is uniform at 100 percent. This would be desirable if you were measuring a laser or focused beam of light and underfilling a detector. The uniform response means that the detector will ignore angular misalignment. Fig. 9.2 Polar plot of ideal detector spatial responses. The cosine response is shown as a circle on the graph. An irradiance detector with a cosine spatial response will read 100 percent at 0 degrees straight on 70.7 .