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Production of a remote measuring system of fruit softening using laser beams and an acoustic wave

使用激光束和声波生产水果软化远程测量系统

基本信息

批准号：
07556012
负责人：
SAKURAI Naoki
金额：
$ 3.39万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07556012/
关键词：
Fruit softening cell walls viscoelastic proterty acoustic wave laser beam Doppler effect ethylene stress-relaxation

项目摘要

The following results were obtained ;(1) When kiwi fruit was vibrated, the Doppler shift of laser beam reflecting from the surface of the fruit was precisely determined by a laser Doppler vibrometer.(2) Amplitude of the vibration of fruit was monitored from 5 to 2000Hz, and several resonance peaks were detected. The resonance frequency decreased when an apple fruit was soften, as reported, but the decrease was not observed in other fruits, suggesting that the resonance frequency is not the best index for the fruit softening.(3) The shift of acoustic waves was observed, when the fruit proceeds softening. There was a good correlation between the phase shift and fruit softening in peach, pear, and citrus orange.(4) The phase shift reflects the inside organization of citrus fruit.(5) The differential signal between an accelerometer attached to the stage of vibrometer and the laser Doppler measuring machine tells the precise vibration signal derived from the test fruit.From these results, the fruit softening measurement system using a laser beam is superior to any other reported method, and is an excellent remote and non-destructive method to evaluate qualitatively and quantitatively the degree of fruit softening. Although we could not produce a prototype of fruit sorting machine, the algorism for evaluating the fruit texture is still being processed in Matsushita-Kotobuki Electronics Industries Ltd.

得到以下结果：(1)利用激光多普勒测振仪精确测定了猕猴桃振动过程中从猕猴桃表面反射的激光束的多普勒频移。(2)在5 ~ 2000Hz范围内监测水果的振动幅值，检测到多个共振峰。据报道，苹果果实软化后共振频率下降，而其他果实软化后共振频率没有下降，说明共振频率不是果实软化的最佳指标。(3)观察到果实软化过程中声波的位移。桃、梨、柑桔的相移与果实软化有较好的相关性。(4)相移反映了柑橘果实的内部组织。(5)安装在测振仪台上的加速度计与激光多普勒测量机之间的差分信号，能准确地反映出被测果实的振动信号。实验结果表明，采用激光束的水果软化测量系统优于已有的其他方法，是一种定性和定量评价水果软化程度的远程、非破坏性方法。虽然我们无法生产出水果分拣机的样机，但评估水果质地的算法仍在松下kotobuki电子工业有限公司进行中。