Harwit M, Phillips P G, King L W, Briotta D A
Appl Opt. 1974 Nov 1;13(11):2669-74. doi: 10.1364/AO.13.002669.
We develop the theory of operation for dispersive spectrometers that modulate radiation at both the entrance and exit apertures by means of Hadamard codes. Specifically, we examine the operation of instruments illuminated by a beam of radiation known to be homogeneous. In this case, all spatial information obtained in the operation of the instrument can be effectively suppressed at no loss of spectral performance and at a considerable reduction in the number of measurements that need to be made. A particularly interesting instrument which mocks a monochromator is described. The spectrum is directly obtained from the data by simply subtracting a constant intensity value from all readings. This instrument bears a resemblance to the Girard grill spectrometer. We describe the construction and operation of an instrument that has been tested in both modes of operation and show some of the spectra obtained.
我们开发了一种用于色散光谱仪的操作理论，该光谱仪通过哈达玛编码在入射和出射孔径处对辐射进行调制。具体而言，我们研究了由已知为均匀的辐射束照射的仪器的操作。在这种情况下，在不损失光谱性能且大幅减少所需测量次数的前提下，仪器操作中获得的所有空间信息都可以被有效抑制。描述了一种特别有趣的模拟单色仪的仪器。通过简单地从所有读数中减去一个恒定强度值，直接从数据中获得光谱。该仪器与吉拉德格栅光谱仪相似。我们描述了一种已在两种操作模式下进行测试的仪器的构造和操作，并展示了获得的一些光谱。
