Fruit hardness nondestructive detection method and device based on laser doppler vibration measurement

A Doppler vibration measurement and Doppler vibration measurement module technology, which is applied to the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve problems such as damage to the vibration state, inability to apply, and limit the scope of application, and achieves fast dynamic response. Accurate and reliable vibration signal, good adaptability

Inactive Publication Date: 2013-06-26
ZHEJIANG UNIV
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Problems solved by technology

The traditional measurement method needs to attach the acceleration sensor to the surface of the object to be measured, and use the output signal to realize the related measurement of "accele

Method used

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  • Fruit hardness nondestructive detection method and device based on laser doppler vibration measurement
  • Fruit hardness nondestructive detection method and device based on laser doppler vibration measurement
  • Fruit hardness nondestructive detection method and device based on laser doppler vibration measurement

Examples

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Embodiment

[0039] Embodiment: based on the non-destructive detection of the papaya hardness of laser Doppler vibration measurement, according to such as figure 1 The steps shown are performed:

[0040] 1. Papaya sample collection:

[0041] Collect 100 papayas in the market, try to select representative papayas to form the modeling sample set, and make the sample hardness range as large as possible.

[0042] 2. Determination of sample mass: weigh the mass of each sample with an electronic balance with an accuracy of 0.01 g.

[0043] 3. Acquisition of vibration signals:

[0044] like figure 2 As shown, the papaya (i.e. fruit 8) is placed on the expansion platform 5, the computer 1 outputs the vibration control signal through the vibration control module 2, and after being amplified by the power amplifier 3, the vibration generator 4 is amplified to work, and the control signal is 5-2000 Hz The sine frequency sweep vibration signal, the starting frequency is 5 Hz, grows in a linear for...

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Abstract

The invention discloses a fruit hardness nondestructive detection method and device based on laser doppler vibration measurement. The detection method comprises the following steps of: collecting representative fruits to form a modeling sample set; detecting the quality of samples; acquiring vibration signals; processing the vibration signals; detecting a hardness standard value; and establishing and testing a hardness prediction model. The detection device comprises a vibration control system and a vibration signal acquisition system. Filtering, infinitesimal analysis, FFT (Fast Fourier Transform) and amplitude frequency response are performed on output signals of a laser doppler vibration measurement controller and an ICP (Inductively Coupled Plasma) acceleration sensor by signal analysis software in a laser doppler vibration measurement module. The fruit hardness nondestructive detection method and device have the advantages of causing no damage to the detected fruits, being not affected by environmental noises, causing no harm to the free vibration of the fruits and being good in adaptability, and realizes the nondestructive detection on fruit hardness.

Description

technical field [0001] The invention relates to a nondestructive detection method and device for fruit hardness, in particular to a nondestructive detection method and device for fruit hardness based on laser Doppler vibration measurement. Background technique [0002] China is known as the "Kingdom of Fruits in the World". Almost all kinds of fruits are produced and the output is high. However, due to backward testing and grading equipment, the competitiveness of fruits in the international market is still not enough, and the export rate is low. Fruits are stored and transported after harvesting. There are problems of ripening, softening and rot in the process. Fruit hardness, also known as firmness, refers to the strength of the pulp against pressure, and can be used as an important indicator for judging maturity and quality. Accurate detection of fruit firmness is of great significance for determining the appropriate harvest period, post-harvest storage, evaluating t...

Claims

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Application Information

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IPC IPC(8): G01N29/04
Inventor 崔笛张文应义斌
Owner ZHEJIANG UNIV
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