CN110320246A

CN110320246A - Apple internal quality nondestructive measure apparatus

Info

Publication number: CN110320246A
Application number: CN201810269404.9A
Authority: CN
Inventors: 田旭; 张新雨; 张子一; 黄铝文
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2019-10-11

Abstract

With the improvement of living standards, requirement of the people for fruit quality is also growing, not only focus on the exterior quality of fruit, such as size, color, have disease-free spot, and more payes attention to the inside quality of fruit.So efficiently and accurately detection fruit internal quality is for improving the quality of agricultural product, the agriculture per capita income of increase, customer service's level being promoted to have great importance.Apple internal non-destructive testing technology is exactly to measure in the case where not damaging apples inside and outside quality to it, it is based on dielectric constant and apple internal quality include a variety of physicochemical properties such as moisture content, sugar content correlative study, the precise measurement of dielectric constant is completed by multi-frequency signal generator, measuring circuit module and other function module, it can be used for the division of fruit grade, complete quality identification and lossless classification to apple.Keyword: non-destructive testing；Multi-frequency signal generator；Equivalent measurement circuit；Dielectric constant；Physicochemical property.

Description

Apple internal quality nondestructive measure apparatus

Technical field:

The present invention is based on dielectric constant and apple internal quality include a variety of physicochemical properties such as moisture content, sugar content phase Research is closed, by multi-frequency signal generator and equivalent measurement circuit module, and it is complete to design other function module conjunction measuring circuit At the precise measurement of dielectric constant, the division of fruit grade is then realized further according to these dielectric properties, completes the product to apple Matter identification and lossless classification.

Background technique:

Since the domestic inside quality detection system for apple is less at present, so research is for the comprehensive lossless of apple There is still a need for continue deeper into for detection device.

Summary of the invention:

The present invention uses multi-frequency signal generator and equivalent measurement circuit, and passes through other function module conjunction measuring electricity Road, to guarantee precisely to complete the measurement of apple dielectric property constant.Then it analyzes it and handles, display to display screen On.

The technical solution adopted by the present invention to solve the technical problems is: multi-frequency signal generator is normal as apple dielectric Driving source required for number nondestructive measurement circuit.By frequency sweep and determine frequency function, successfully issues 5 and determine frequency point and frequency sweep model It is trapped among the sinusoidal signal of 100Hz~5MHz.Measuring circuit module is divided into two parts, and first part is signal measurement part, Second part is signal behavior part.Circuitry for signal measurement completes the function such as small-signal enlarging function, voltage stabilizing function, phase sensitive detection After energy, the dielectric constant values under 5 frequency points and frequency sweep function are acquired and are measured, letter is carried out by selection circuit after measurement Number selection display, then using digital-to-analogue conversion will selection signal digitize after be shown in display screen.

Effective achievement of the invention is: energy precise measurement apple internal quality factor, and is used for the lossless classification of apple.

Detailed description of the invention:

Fig. 1 is general frame figure

Fig. 2 is overall Technology Roadmap

Fig. 3 is multi-frequency signal generator architecture diagram

Fig. 4 is signal occurring principle figure

Fig. 5 is the hardware circuit diagram of multiple-frequency generator

Fig. 6 is measuring circuit functional diagram

Fig. 7 is measuring circuit basic schematic diagram

Fig. 8 is measuring circuit frame composition

Fig. 9 is the detailed circuit diagram of full adder circuit

Figure 10 is the detailed circuit diagram of voltage follower circuit

Figure 11 is the detailed circuit diagram of half-wave rectifying circuit

Figure 12 is the detailed circuit diagram of AD conversion Yu viewing hardware schematic diagram

Specific embodiment:

In Fig. 1, signal generator module issues program-controlled sine wave as driving source first, and being output to Acquisition Circuit is SIG1, it is SIG2 that driving source, which is output to Acquisition Circuit by measurement object model, and the two paths of signals of acquisition is analyzed and located Reason is shown to display screen.

In Fig. 4, signal occurs chip and generally mainly consists of three parts.First part is that DDS kernel is also AD9850 Core, including the control of microcontroller, phase controlling, frequency, phase accumulator, phase register；Second part is interface electricity Road, for receiving the data of single-chip microcontroller transmission；Part III is artificial circuit part, mainly by converter (DAC), low pass filtered Wave device (LPF) sine look up table and comparator are constituted.The core of the core of AD9850 and a programmable DDS system is that phase is tired Add device, it is made of an adder and a N phase registers, and N is normally at 24~32.When often carrying out an external reference Clock, phase register are just progressively increased with step-length M.The output of phase register can be input to sinusoidal inquiry after being added with phase control words On table address.Sine look up table includes the digital amplitude information of a sine wave period, each address corresponds in sine wave 0 ° A phase point within the scope of~360 °.The phase information of input address is mapped to sinusoidal amplitude signal by inquiry table, then Drive digital analog converter (DAC) to export analog quantity.

In Fig. 5, Chip Microcomputer A: chip occurs for signal and sinusoidal signal occurs for single-chip microcontroller STC89C52 as entire measurement The signal driving source of system generates signal 1, generates signal 2 by measurand, two groups of signal frequencies are identical, and there are phase differences. Chip, which occurs, for signal the identical sine wave of occurrence frequency, triangular wave and square wave to select in circuit in order to facilitate calculating simultaneously Select generation sine wave.Two paths of signals passes through A/D converter circuit, stores after handling in Chip Microcomputer A in digital form.Chip Microcomputer A It is mainly responsible for the functions such as signal generation, signal frequency phase controlling, digital-to-analogue conversion, stored digital.Single-chip microcontroller B: major function is Realize human-computer interaction, human-computer interaction module includes display module, Keysheet module, transmission module etc..Display module realizes measurement institute Obtain the real-time display and control display of impedance data；Keysheet module realizes the setting and display operation to system parameter.

In Fig. 6, Fig. 7, Fig. 8, circuitry for signal measurement uses full adder circuit is (as shown in Figure 9) to carry out faint letter first Number amplification.For the voltage stabilizing function for realizing circuit, in circuit, voltage follower circuit (as shown in Figure 10) is generally as buffer stage And isolation level, it is ensured that be independent of each other between the prime of circuit voltage, late-class circuit, reduce the loss on circuit improve it is original The load capacity of circuit reduces error, mainly uses LM358 chip.Then pass through half-wave rectifying circuit (as shown in figure 11) again The analog signal that can not be read is converted into readable number finally by AD conversion by the rectification and detection function for completing circuit Signal, it is main that ADC0809 chip is selected to complete this function.Signal behavior function is to control eight path analoging switch cores by single-chip microcontroller What piece CD4051 was completed, the signal after selection is input to ADC0809, and ADC0809 completes AD conversion conversion, finally will be digital Signal shows (its AD conversion and viewing hardware schematic diagram are as shown in figure 12) on a display screen.

Claims

1. a kind of detection device for apple internal quality factor detection and lossless classification, including multi-frequency signal generator, etc. Imitate the functional module of measuring circuit and some conjunction measuring circuits, it is characterised in that: pass through multi-frequency signal generator and equivalent survey It measures circuit module and other function module conjunction measuring circuit completes the precise measurement of apple internal dielectric constant, realize apple Fruit quality identification and lossless classification.

2. the detection device of apple internal quality factor detection and lossless classification according to claim 1, it is characterised in that: It uses multi-frequency signal generator as the driving source of apple internal dielectric constant nondestructive measurement circuit, successfully issues 5 different frequencies Under sine wave, then after completing the functions such as small-signal enlarging function, voltage stabilizing function and phase sensitive detection by measuring circuit, to 5 Dielectric constant under a frequency point is acquired and measures, and digitizes the signal of selection finally by selection circuit and digital-to-analogue conversion After be shown in display screen.

3. the detection device of apple internal quality factor detection and lossless classification according to claim 1, it is characterised in that: Using direct digital frequency synthesis technology (DDS), by signal chip and single-chip microcontroller occur for multi-frequency signal generator Driving source of the sinusoidal signal as the Signal Measurement System of entire measuring system occurs for STC89C52.Wherein signal occur chip by Three parts composition, first part is the core that DDS kernel is also AD9850, including the control of microcontroller, phase controlling, frequency, Phase accumulator, phase register；Second part is interface circuit, for receiving the data of single-chip microcontroller transmission；Part III is Artificial circuit part is mainly made of converter (DAC), low-pass filter (LPF) sine look up table and comparator.

4. the detection device of apple internal quality factor detection and lossless classification according to claim 1, it is characterised in that: Circuitry for signal measurement is made of full adder circuit, voltage follower circuit (using LM358 chip) and half-wave rectifying circuit, finally Using AD conversion, unreadable analog signal is converted into readable digital signal, it is main that ADC0809 chip is selected to complete this Function.