中温面源黑体是一种宽带红外参考源，其波长范围覆盖了从近红外到远红外的波段，辐射面的温度具有很高的精度。作为高辐射强度的参考源，中温面源黑体已被广泛应用于红外传感器如辐射温度计、红外热像仪的校准以及样品辐射率或透过率的测量。用基于大辐射面和坚实结构的面源黑体在实验室内或野外测试中对无准直仪时的红外传感器进行了标定。为了提供红外系统性能测试的解决方案，本文对中温面源黑体进行了设计和性能参数测试。结果表明，其主要参数能满足高稳定度和高精度的要求。

The intermediate temperature extended area blackbody is a wide spectral bandwidth infrared reference source. Its wavelength range covers near infrared to far infrared. As a reference source with high radiation intensity, it has been widely used in the calibration of infrared sensors such as radiation thermometers and infrared thermal imagers and in the measurement of the emissivity or transmission of samples. An extended area blackbody based on a robust structure with large emitting area is used to calibrate infrared sensors without collimators in laboratory or in the fields. To provide a solution for the performance test of infrared systems, an extended area blackbody is designed and its performance parameters are tested. The resultsshow that the main parameters can meet the requirements of high stability and high precision.