基于辐射定标的某型红外光纤传像束双波段透过率测定

Dual-band Transmittance Measurement of a Certain Type Infrared Fiber Image Bundle Based on Radiation Calibration

由于目前国内尚没有针对红外光纤传像束的波段透过率测试的规范标准和设备。提出了一种考虑光纤孔径角和光纤芯径的热像仪定标方法和某型光纤传像束的双波段透过率测试方法。通过在冷屏两端分别设置直径为8 mm和62μm的两个光阑孔,确保定标条件和所测光纤的孔径角和光纤芯径相同;再通过在光路中插入波段滤光片来选择需要定标的波段.建立了基于最小二乘的红外热像仪定标模型,并采用该方法进行了定标实验。根据定标结果,测量了某型光纤传像束的红外光纤在2.0μm^2.6μm波段和3.4μm^4.8μm波段的透过率,其平均透过率大于70%。

Since there are not test standards and equipment for the waveband transmittance of infrared fiber image bundle in China at present,both a thermal camera calibration method which takes fiber aperture angle and fiber diameter into account and a dual-band transmittance measurement method for a certain type fiber image bundle are proposed.To ensure the calibration condition and the aperture angle and diameter of optical fibers to be consistent,two apertures of 8 mm and 62 urn in diameter are set at both ends of a cold shield respectively.Then,the waveband to be calibrated is selected by inserting a band filter in the optical path.An infrared thermal camera calibration model based on least squares is established and is used in the calibration experiment.According to the calibration results,the transmittance values of a certain type optical fiber image bundle in the wavebands of 2.0-2.6 urn and3.4-4.8 μm are measured.The average transmittance is greater than 70%.