A spectroscopic diagnostic method, to measure electron temperature of radiationheatedCH foam on Shenguang Ⅱ laser facility, is described. A tracer layer of aluminum wasembedded in the middle of the CH foam and a point-projection method used in the opacity experimentwas induced to measure the transmission spectrum of the embedded Al foil. The electrontemperature, of about 80 eV, was deduced through a comparison of the experimental absorptionspectrum with the calculated one with a detailed level accounting opacity code. The results ofhydrodynamic simulation show that it's reasonable to determine the CH foam temperature bymeasuring the embedded Al absorption spectrum. Thus, the electron temperature of radiationheatedCH foam was obtained.
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