提出了一种基于圆盘旋转光栅调制的傅里叶变换光谱仪 (FTS) ,光栅同时实现了分束和外差调制的功能。分析了三种实现分光的方案 ,通过对三个波长分别为 670nm ,63 3nm和 5 3 2nm的激光进行了频谱测量实验 ,结果表明该光谱仪具有良好的稳定性和抗干扰能力 ,经调制后测量灵敏度倍增 2 0倍 ,尤其适用于微弱信号测量和近红外领域。 A Fourier transform spectrometer (FTS) based on disk rotation grating modulation was proposed. The grating also realized the function of beam splitting and heterodyne modulation. Three schemes for spectral analysis were analyzed. Spectral measurement experiments were carried out on three laser wavelengths of 670nm, 63 3nm and 532 nm, respectively. The results show that the spectrometer has good stability and anti-jamming ability. After the modulation measurement Doubling the sensitivity of 20 times, especially for weak signal measurement and near-infrared field.