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黑体的温度越高,太赫兹波段辐射量越大,测试信噪比越高,但红外辐射量增大的幅度远大于太赫兹辐射量,难以滤除,滤除效果不好则会降低黑体太赫兹辐射测试的准确度。为了准确测试黑体的太赫兹辐射量,选择了合适温度范围的黑体,设计了其太赫兹辐射量测试方法。首先,根据普朗克公式计算温度范围在3～600K的黑体在太赫兹宽波段和红外波段的辐射出射度以及在不同太赫兹窄带波段的辐射出射度,分析了相对变化趋势;其次,提出了黑体太赫兹辐射锁相探测方法,选择的太赫兹黑体温度范围为223～273K。实验结果显示,在此温度范围内,黑体在100～3000μm波段的太赫兹相对辐射量与实测相对值的误差范围为0.1%～2.0%,且曲线变化趋势一致,说明该方法能够实现黑体太赫兹宽波段辐射量测试。
The higher the temperature of black body, the greater the radiation amount in the terahertz band, the higher the signal-to-noise ratio of the test. However, the increase of the infrared radiation is far greater than that of the terahertz radiation and is difficult to filter out. Hertz radiation test accuracy. In order to accurately test the amount of terahertz radiation of a blackbody, a blackbody of a suitable temperature range was selected and its terahertz radiation testing method was designed. Firstly, according to Planck’s formula, the radiation excursion of the black body in the terahertz-wide band and the infrared band with the temperature range of 3 ~ 600K and the radiation emissivity in the narrow band of different terahertz bands are calculated. Secondly, Blackbody terahertz radiation lock detection method, the choice of terahertz black body temperature range of 223 ~ 273K. The experimental results show that in this temperature range, the error of terahertz relative irradiance and measured relative value of blackbody in the band of 100-3000μm is 0.1% ~ 2.0%, and the trend of the curve is consistent, which shows that the method can realize the black body terahertz Wide Band Radiation Testing.