Abstract:
A scanning monochromator uses a pulse-driven micro-stepping motor (20) to drive a spectral-dispersion element (33) via a reduction-gear harmonic drive (21). The motor (20) is directly coupled to the input hub of the reduction-gear drive (21), and the output hub of the reduction-gear drive directly supports the spectral-dispersion element (33). By selecting a motor (20) with a great number of steps per revolution, and a harmonic drive (21) with a great reduction ratio, a resolution of 5 million pulsed steps is available, per single rotation of the output hub of the reduction-gear drive. This translates into more than 600,000 incremental angular-displacement steps over a usable 45° range of dispersion-element rotation.
Abstract:
Ein Spektrophotometer zum Messen von Absorptions- oder Emissionsbanden im optischen Bereich elektromagnetischer Strahlung (2) umfasst eine Lichtquelle (1), einen von einer Steuereinrichtung (21, 22; 21, 22, 23) angesteuerten, über das Spektrum der Lichtquelle (1) verstellbaren Monochromator (5), einen Photosensor (6) zum Messen der Intensität (I) von den Monochromator (5) durchdringenden monochromatischen Strahlen (14) sowie eine Auswerteeinheit (19) für Messignale des Photosensors (6). Der Monochromator (5) moduliert die Wellenlänge mit einer Wellenlängenamplitude (δW) und einer Frequenz (f₁) der am Photosensor (6) eintreffenden Strahlen (14). Das Auswerten von Signalen des Photosensors (6) erfolgt synchron zur Modulation der Wellenlänge der Strahlen (14). Die Modulation der Wellenlänge ist einstellbar.
Abstract:
Iterative compensation of drift of peak positions of spectral lines in a spectral monochromator including a grating, a detector of spectral fractions of a spectral band, a stepper motor for varying relative orientation of the grating and the detector, and a computer. A series of computer-defined spectral windows each encompasses one spectral band and has a nominal spectral position and an initial spectral center. Each window is scanned such as to determine a peak spectral position. Calculations are made for a spectral offset of the peak position from the initial center for each corresponding window, an average of the offsets for the peaks as a linear function of window position, and a revised spectral center for each window equal to the initial center plus the average offset for the window position determined from the linear function. Each window is shifted correspondingly. The step of successively scanning through each window is repeated such as to determined a new peak position for each corresponding band, whereby each new peak position is maintained near the spectral center of each corresponding window.
Abstract in simplified Chinese:本发明为一种实时空间与时间光谱量测系统及其量测模块,其中实时空间与时间光谱量测系统包括激发光源及量测模块。激发光源用以激发萤光样品,量测模块则接收并分析萤光样品受激发后发出之萤光。量测模块包括单光子线性扫瞄侦测器及线性CCD光谱仪,单光子线性扫瞄侦测器能选择性拦截萤光分光分波后具有多个波长的多波长光束中的特定波长,以产生单波长时间解析信号,而线性CCD光谱仪则能接收多波长光束并产生萤光全光谱信号。借由本发明之实施,可以同时观测萤光全光谱信号与单波长时间解析信号,进而提高萤光光谱仪的使用便利性。