Title: Fast and high-accuracy measuring technique for transmittance spectrum in VIS-NIR,
Abstract: In this paper, based on the framework of traditional spectrophotometry, we
put forward a novel fast and high-accuracy technique for measuring
transmittance spectrum in VIS-NIR wave range, its key feature is that during
the measurement procedure, the output wavelength of the grating monochromator
is kept increasing continuously and at the same time, the photoelectric
detectors execute a concurrently continuous data acquisition routine. Initial
experiment result shows that the newly proposed technique could shorten the
time consumed for measuring the transmittance spectrum down to 50% that of the
conventional spectrophotometric method, a relative error of 0.070% and a
repeatability error of 0.042% are generated. Compared with the current mostly
used techniques (spectrophotometry, methods based on multi-channel spectrometer
and strategy using Fourier transform spectrometer) for obtaining transmittance
spectrum in VIS-NIR, the new strategy has at all once the following advantages,
firstly the measuring speed could be greatly quicken, fast measurement of
transmittance spectrum in VIS-NIR is therefore promising, which would find wide
application in dynamic environment, secondly high measuring accuracy
(0.1%-0.3%) is available, and finally the measuring system has high mechanical
stability because the motor of the grating monochromator is rotating
continuously during the measurement.