An instrument, based on near infrared (NIR) reflectance techniques, is described which is capable of determining nondestructively the percent soluble solids (SS) in whole honeydew melons. It uses tilting-interference-filter technology for wavelength scanning and a silicon detector with preamplifier for sensing radiation which has passed through inner melon flesh. The standard error of calibration was 0.82 SS when compared with standard laboratory refractometer measurements.
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Dull et al. (1992) studied this question.