MODULATION TRANSFER-FUNCTION MEASUREMENT OF SPARSE-ARRAY SENSORS USING A SELF-CALIBRATING FRINGE PATTERN

被引:28
作者
GREIVENKAMP, JE
LOWMAN, AE
机构
[1] Optical Sciences Center, University of Arizona, Tucson, AZ
来源
APPLIED OPTICS | 1994年 / 33卷 / 22期
关键词
MODULATION TRANSFER FUNCTION; IMAGE SENSORS; FOCAL PLANE ARRAYS; INTERFEROMETRY; CHARGE-INJECTION DEVICES;
D O I
10.1364/AO.33.005029
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A simple method for the measurement of the pixel modulation transfer function (MTF) of sparse-array (extended MTF) sensors has been developed. We use a phase-shifting Twyman-Green interferometer to generate a series of single spatial-frequency fringe patterns incident on the sensor The resulting signal modulation is measured. We achieve self-calibration by restricting the measured spatial frequencies to multiples of the Nyquist frequency. The aliased patterns at these frequencies are unique and easily identifiable. Spatial frequencies of 480 cycles/mm are generated and measured. This frequency value is more than ten times that of the sensor sampling frequency. The expected MTF shape is obtained at multiples of the sampling frequency. At odd multiples of the Nyquist frequency, the MTF's are affected by the electronic bandwidth and cross talk in the charge-injection device sensor.
引用
收藏
页码:5029 / 5036
页数:8
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