In recent years, optical spectral sensing has played an increasingly important role in production environments for process control, materials inspection, and finished product quality. Instruments capable of measuring UV/VIS/NIR properties of materials in transmission or reflection range from simple filter photometers, which can measure at a few discreet wavelengths, to grating-based spectrophotometers which can acquire spectra at high resolution over broad spectral ranges. A new type of spectral sensor has been developed using a linear variable filter (LVF), a spectrally selective bandpass filter having a wedged thickness across the substrate. When coupled to an array detector such as a PDA or CCD, an LVF-based spectral sensor can provide the broad range of a grating system, more channels of information than a filter photometer, and in a much smaller package than either. We will explain the properties of an LVF and the various design forms available for an LVF-based spectral sensor.
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机译：近年来，光谱传感在工艺控制，材料检验和成品质量的生产环境中发挥了越来越重要的作用。能够测量从简单的过滤器光度计中测量透射率或反射范围内材料的UV / VI / NIR性质的仪器，该仪器可以以少量致密的波长测量到基于光栅的分光光度计，这可以在宽的光谱范围内以高分辨率获取光谱。已经使用线性可变滤波器（LVF）开发了一种新型的光谱传感器，一种光谱选择带通滤光器，其具有穿过基板的楔形厚度。当耦合到诸如PDA或CCD的阵列检测器时，基于LVF的光谱传感器可以提供光栅系统的宽范围，比过滤光度计更多的信息通道，并且比其均更小的封装。我们将解释LVF的属性和可用于基于LVF的光谱传感器的各种设计形式。
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