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MEMS-based Speckle Spectrometer

机译:基于MEMS的散斑光谱仪

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We describe a new concept for a MEMS-based active spatial filter for astronomical spectroscopy. The goal of this device is to allow the use of a diffraction-limited spectrometer on a seeing limited observation at improved throughput over a comparable seeing-limited spectrometer, thus reducing the size and cost of the spectrometer by a factor proportional to r_0/D (For the case of a 10 meter telescope this size reduction will be approximately a factor of 25 to 50). We use a fiber-based integral field unit (IFU) that incorporates an active MEMS mirror array to feed an astronomical spectrograph. A fast camera is used in parallel to sense speckle images at a spatial resolution of λ/D and at a temporal frequency greater than that of atmospheric fluctuations. The MEMS mirror-array is used as an active shutter to feed speckle images above a preset intensity threshold to the spectrometer, thereby increasing the signal-to-noise ratio (SNR) of the spectrogram. Preliminary calculations suggests an SNR improvement of a factor of about 1.4. Computer simulations have shown an SNR improvement of 1.1, but have not yet fully explored the parameter space.
机译:我们描述了一种用于天文光谱学的基于MEMS的有源空间滤波器的新概念。该设备的目的是允许在有限的观察视野上使用衍射极限光谱仪,并且与类似的观察极限光谱仪相比具有更高的通量,从而将光谱仪的尺寸和成本降低了与r_0 / D成比例的因子(对于10米望远镜,这种尺寸减小大约为25到50。我们使用基于光纤的集成场单元(IFU),该单元结合了有源MEMS反射镜阵列以馈送天文光谱仪。快速相机并行使用,以λ/ D的空间分辨率和大于大气波动的时间频率感测斑点图像。 MEMS反射镜阵列用作主动快门,将预设强度阈值以上的斑点图像馈送到光谱仪,从而增加了光谱图的信噪比(SNR)。初步计算表明,SNR可以提高约1.4倍。计算机仿真显示SNR改善了1.1,但尚未完全探究参数空间。

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