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Portable watermelon tester apparatus

A tester and portable technology, applied in the field of portable watermelon tester, can solve the problems of large volume and high cost

Inactive Publication Date: 2004-12-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of practicality, the former is too bulky and expensive, while the latter still has certain requirements for the operator

Method used

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  • Portable watermelon tester apparatus
  • Portable watermelon tester apparatus
  • Portable watermelon tester apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] like figure 1 , figure 2 As shown, it includes:

[0016] The first and second miniature microphones MIC1 and MIC2 are respectively fixed on the bracket 2 through the leather cup 3, and the impact hammer 6 is clamped on the bracket 2 through the hinge 5, one end of the spring 4, and the pluggable stop rod 1, and the impact hammer The shaft of 6 can be clamped between the other end of spring 4 and stop bar 1;

[0017] The first and second miniature microphones MIC1 and MIC2 form a bridge with the first and second resistors R1 and R2, through the first capacitor C1, the third resistor R3 and the second capacitor C2, the fourth, fifth and sixth resistors The differential amplifier composed of R4, R5, R6 and the first amplifier A1, the active filter composed of the seventh and eighth resistors R7, R8, the third capacitor C3 and the second amplifier A2, the ninth, tenth, The comparator formed by the eleventh resistors R9, R10, R11 and the third amplifier A3 is connected t...

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PUM

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Abstract

The invented portable tester for testing watermelon includes the two miniature microphones, which through the leather cups are fixed on the bracket. The drive hammer trough the hinge is installed on the bracket. The one end of the spring is fixed on the bracket, and the stop rod is on the bar of the drive hammber above the spring. The signal wire through the differential amplifier, the filter and the comparator to the microprocessor. In the ripening process of watermelon, the propagation speed of the sound wave is decreased as increase of the maturity. This is the reference of the invention. The two microphones are setup at certain distance. Slapping watermelon generates the sound wave. The two microphones record the sound wave. The propagation speed is calculated from the time difference of the two microphones so as to determine the maturity.

Description

technical field [0001] The invention relates to a device capable of nondestructively detecting the ripeness of watermelon. Especially a portable watermelon tester. Background technique [0002] There are many ways to identify the ripeness of watermelon. The most common method is to beat the melon body by hand and judge its maturity by listening to the sound. This method depends entirely on the experience of the operator. In order to obtain a more objective and simple test method, some researches have been carried out at home and abroad: [0003] Labeling method: put the same label on the same batch of artificially pollinated watermelons, and after a period of time, use a destructive method to conduct sampling inspections. Obviously this is a destructive detection method. [0004] Test weight method: Judging the maturity of watermelon by measuring its volume and weight. This type of method all uses watermelon drainage to measure the volume and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/00
Inventor 应义斌饶秀勤
Owner ZHEJIANG UNIV
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