CN105181636A - Grape sugar degree nondestructive detection apparatus and method thereof - Google Patents
Grape sugar degree nondestructive detection apparatus and method thereof Download PDFInfo
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- CN105181636A CN105181636A CN201510557250.XA CN201510557250A CN105181636A CN 105181636 A CN105181636 A CN 105181636A CN 201510557250 A CN201510557250 A CN 201510557250A CN 105181636 A CN105181636 A CN 105181636A
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Abstract
The invention provides a grape sugar degree nondestructive detection apparatus and a method thereof. The apparatus comprises a broadband light source, a fixed station, a darkroom, an embedded collimating lens first interface and an embedded focusing lens second interface which are connected with the darkroom through two light holes on two opposite side surfaces of the darkroom, a grape carrying platform and a spectrometer which are arranged on a stepping motor rotating shaft, a host computer, a stepping motor controller and a stepping motor arranged on the fixed station; the spectrometer is connected with the second interface through a fiber; incident light spots formed by the broadband light source through a collimating lens irradiate a grape sample to be detected on the grape carrying platform; the focusing lens focuses lights transmitting the grape sample to be detected, the focused lights are transmitted to the spectrometer through the fiber, and the spectrometer obtains a transmission spectrum and sends the transmission spectrum to the host computer; and the host computer controls the stepping motor to rotate through the stepping motor controller, and obtains the transmission spectrum synchronous to rotation of the stepping motor and sent by the spectrometer. The apparatus can eliminate influences of grape seeds on grape sugar degree detection, and improves the detection precision.
Description
Technical field
The present invention relates to grape pol technical field of nondestructive testing, particularly relate to a kind of grape pol the cannot-harm-detection device and method.
Background technology
At present in the process brewageing red wine, in order to ensure red wine quality, needing to select high-quality starting material, namely needing the grape selecting high-quality, then confirm that each side parameter of grape serves vital effect for red wine product quality in advance.For the grape needed for wine brewing, pol weighs its important parameter whether being applicable to brewage.
Existing based in the grape pol Non-Destructive Testing of visible near-infrared transmitted spectrum, the precision that in grape to be measured, the existence meeting affecting glucose degree of grape pip detects.
Given this, in the Non-Destructive Testing of grape pol, how to eliminate grape pip impact, become the current technical issues that need to address with the accuracy of detection improving grape pol.
Summary of the invention
For defect of the prior art, the invention provides a kind of grape pol the cannot-harm-detection device and method, the automatic acquisition of grape Sample Maximal transmitted spectrum position to be measured in the Non-Destructive Testing of grape pol can be realized, eliminate the impact that grape pip detects grape pol, improve the accuracy of detection of grape pol.
First aspect, the invention provides a kind of grape pol the cannot-harm-detection device, comprising: the second interface of the first interface of wideband light source, embedded collimation lens, grape microscope carrier, darkroom, embedded condenser lens, optical fiber, spectrometer, host computer, controllor for step-by-step motor, stepper motor and fixed station;
Described darkroom has two unthreaded holes, be symmetricly set on the two sides that described darkroom is relative, described first interface is connected with described darkroom by first unthreaded hole, described second interface is connected with described darkroom by second unthreaded hole, described spectrometer is connected with described second interface by described optical fiber, described host computer respectively with described spectrometer, controllor for step-by-step motor connects, described controllor for step-by-step motor is connected with described stepper motor, described darkroom is arranged on described fixed station, described stepper motor at described darkroom internal fixtion on described fixed station, described grape microscope carrier is fixed in the rotating shaft of described stepper motor,
Wherein, the light that described wideband light source sends irradiates the grape sample to be measured that the described grape microscope carrier in described darkroom is placed by the collimation lens formation launching spot that described first interface is embedded; Light transmitted through described grape sample to be measured focuses on by described second interface embedded condenser lens, then by optical fiber by the light transmission after focusing on to described spectrometer; Described spectrometer obtains transmitted spectrum according to the light received, and described transmitted spectrum is sent to host computer; Described host computer controls the rotation of described stepper motor by described controllor for step-by-step motor, and obtains the transmitted spectrum synchronous with the rotation of described stepper motor of described spectrometer transmission.
Alternatively, on the center line being centrally located at described first interface and described second interface of described collimation lens, described condenser lens and described grape sample to be measured.
Alternatively, described grape microscope carrier is the right cylinder that upper surface is provided with hemispherical groove, and the lower surface of described grape microscope carrier is fixed in the rotating shaft of described stepper motor.
Alternatively, described wideband light source is halogen tungsten lamp;
And/or,
Described spectrometer adopts visible and near infrared spectrum instrument.
Alternatively, described first interface and the second interface are SMA905 interface;
Correspondingly, described wideband light source is SMA905 interface wideband light source, and described optical fiber is SMA905 Interface Fiber, and described spectrometer is SMA905 interface spectrometer.
Alternatively, described optical fiber adopts silica fibre, and core diameter and numerical aperture are respectively 1mm and 0.48mm.
Alternatively, the diameter of described collimation lens is 10mm, obtains the launching spot of 3mm;
And/or,
The diameter of described condenser lens is 10mm.
Alternatively, described host computer is connected with described spectrometer by USB data line;
And/or,
Described fixed station is aluminum fixed station.
Second aspect, the invention provides a kind of grape pol lossless detection method based on above-mentioned grape pol the cannot-harm-detection device, comprising:
Host computer sends the first pulse signal to controllor for step-by-step motor, to make described controllor for step-by-step motor according to described first pulse signal control step motor according to default step angle rotating 360 degrees, and obtain spectrometer and often rotate transmitted spectrum corresponding to a default step angle at described stepper motor according to what obtain during default step angle rotating 360 degrees, and the transmitted spectrum of acquisition is numbered according to rotational order is ascending from 1;
The numbering corresponding according to the transmitted spectrum of the transmitted spectrum obtained, acquisition and default step angle, determine the rotation number of degrees of stepper motor;
According to the determined rotation number of degrees, the second pulse signal is sent to controllor for step-by-step motor, to make described controllor for step-by-step motor rotate the determined rotation number of degrees according to described second pulse signal control step motor according to sense of rotation during rotating 360 degrees, and obtain the transmitted spectrum that spectrometer now obtains;
Send the 3rd pulse signal to controllor for step-by-step motor, to make described controllor for step-by-step motor revolve turnback according to described 3rd pulse signal control step motor according to sense of rotation during rotating 360 degrees, and obtain the transmitted spectrum that spectrometer now obtains;
The transmitted spectrum that the transmitted spectrum obtained when stepper motor rotates the determined rotation number of degrees according to spectrometer and spectrometer obtain when stepper motor revolves turnback, by the grape pol Non-Destructive Testing mathematical model preset, obtain the grape pol of the grape sample to be measured eliminating grape pip impact.
Alternatively, the numbering corresponding to transmitted spectrum of described transmitted spectrum according to obtaining, acquisition and default step angle, determine the rotation number of degrees of stepper motor, comprising:
The transmitted spectrum of acquisition is contrasted, obtains the numbering corresponding to large transmitted spectrum, using the rotation number of degrees of the product of this numbering and default step angle as stepper motor.
As shown from the above technical solution, grape pol the cannot-harm-detection device of the present invention and method, the automatic acquisition of grape Sample Maximal transmitted spectrum position to be measured in the Non-Destructive Testing of grape pol can be realized, eliminate the impact that grape pip detects grape pol, improve the accuracy of detection of grape pol.
Accompanying drawing explanation
The structural representation of a kind of grape pol the cannot-harm-detection device that Fig. 1 provides for one embodiment of the invention;
The schematic flow sheet of a kind of grape pol lossless detection method based on the pol of grape shown in Fig. 1 the cannot-harm-detection device that Fig. 2 provides for one embodiment of the invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 shows the structural representation of a kind of grape pol the cannot-harm-detection device that one embodiment of the invention provides, as shown in Figure 1, grape pol the cannot-harm-detection device of the present embodiment, comprising: the second interface 13 of the first interface 2 of wideband light source 1, embedded collimation lens 8, grape microscope carrier 4, darkroom 5, embedded condenser lens 10, optical fiber 6, spectrometer 7, host computer 9, controllor for step-by-step motor 11, stepper motor 12 and fixed station 14;
Described darkroom 5 has two unthreaded holes, be symmetricly set on the two sides that described darkroom 5 is relative, described first interface 2 is connected with described darkroom 5 by first unthreaded hole, described second interface 13 is connected with described darkroom 5 by second unthreaded hole, described spectrometer 7 is connected with described second interface 13 by described optical fiber 6, described host computer 9 respectively with described spectrometer 7, controllor for step-by-step motor 11 connects, described controllor for step-by-step motor 11 is connected with described stepper motor 12, described darkroom 5 is arranged on described fixed station 14, described stepper motor 12 at described darkroom 5 internal fixtion on described fixed station 14, described grape microscope carrier 4 is fixed in the rotating shaft of described stepper motor 12,
Wherein, the light that sends of described wideband light source 1 forms the grape sample 3 to be measured that described grape microscope carrier 4 that launching spot irradiates in described darkroom 5 is placed by the collimation lens 8 that described first interface 2 is embedded; Light transmitted through described grape sample 3 to be measured focuses on by the embedded condenser lens 10 of described second interface 13, then by optical fiber 6 by the light transmission after focusing on to described spectrometer 7; Described spectrometer 7 obtains transmitted spectrum according to the light received, and described transmitted spectrum is sent to host computer 9; Described host computer 9 controls the rotation of described stepper motor 12 by described controllor for step-by-step motor 11, and obtains the transmitted spectrum synchronous with the rotation of described stepper motor 12 of described spectrometer 7 transmission.
In a particular application, on the center line being centrally located at described first interface 2 and described second interface 13 of collimation lens 8, described condenser lens 10 and described grape sample 3 to be measured described in the present embodiment.
In a particular application, grape microscope carrier 4 described in the present embodiment can be preferably the right cylinder that upper surface is provided with hemispherical groove, and during to guarantee stepper motor 12 low speed rotation, grape sample 3 to be measured can stablize placement;
The lower surface of described grape microscope carrier 4 is fixed in the rotating shaft of described stepper motor, and its whole height guarantees that the equatorial positions of grape sample 3 to be measured drops on the center line of described first interface 2 and described second interface 13 substantially.
In a particular application, wideband light source 1 described in the present embodiment can be preferably little, the powerful halogen tungsten lamp of lighting angle.
In a particular application, spectrometer 7 described in the present embodiment can preferably adopt visible and near infrared spectrum instrument.
In a particular application, described in the present embodiment, optical fiber 6 preferably can adopt silica fibre, and the angle that optical fiber 6 receives light limits by fiber numerical aperture, and numerical aperture is larger, and acceptance angle is larger.In order to better receive transmitted ray, described in the present embodiment, optical fiber 6 can select the silica fibre of large core high numerical aperture, and core diameter and numerical aperture can be respectively 1mm and 0.48mm.
In a particular application, for example, described in the present embodiment, first interface 2 and the second interface 12 all can be preferably SMA905 interface;
Correspondingly, described wideband light source 1 is SMA905 interface wideband light source, and described optical fiber 6 is SMA905 Interface Fiber, and described spectrometer 7 is SMA905 interface spectrometer.
In a particular application, described in the present embodiment, the diameter of collimation lens 8 can be preferably 10mm, obtains the launching spot of 3mm; The diameter of described condenser lens 10 can be preferably 10mm, and the light that focused transmission crosses grape sample 3 to be measured enters optical fiber 6, can improve the efficiency that transmitted ray enters optical fiber 6.
In a particular application, host computer 9 described in the present embodiment is connected with described spectrometer 7 by USB data line.
In a particular application, described in the present embodiment, fixed station 14 can be preferably aluminum fixed station, is convenient to increase appropriate counterweight and guarantees the stable of stepper motor 12 fixed thereon.
Will be understood that, described in the present embodiment, grape microscope carrier 4, controllor for step-by-step motor 11 and fixed station 14 form testing sample rotation system.
It should be noted that being embedded in the grape pip almost symmetry surveyed in grape berry is distributed in grape centre position, and have certain thickness pulp district in the middle of grape pip.When using visible near-infrared transmitted spectrum to detect grape pol, when obtaining spectrum, have two kinds of extreme cases:
One, when light irradiates grape centre position perpendicular to grape pip, because grape pip density is excessive, through less light, minimum transmitted spectrum is obtained;
Two, when light ray parallel irradiates grape in grape pip, without the need to through grape pip during certain thickness pulp district middle due to light therethrough grape pip, through more light, max transmissive spectrum is obtained.
Therefore, the present invention, in grape pol Non-Destructive Testing process, when improving light source utilization ratio, selecting the max transmissive spectrum of acquisition to set up the model of grape pol Non-Destructive Testing, can eliminate the impact of grape pip.Before obtaining max transmissive spectrum, need the position finding max transmissive spectrum, and stepper motor can by arranging the angle that step angle accurately controls to rotate, therefore stepper motor can be used to drive grape sample to be measured to rotate one week (namely 360 degree), obtain the corresponding transmitted spectrum of each step angle and be numbered from small to large from 1 according to rotational angle order from low to high, contrast numbered transmitted spectrum, find out the numbering that max transmissive spectrum is corresponding, by this numbering and the product of step angular distance are carried out Driving Stepping Motor as the anglec of rotation, rotate to max transmissive spectral position and carry out the detection of grape pol, realize the impact eliminating grape pip in the Non-Destructive Testing of grape pol.
For example, device described in the present embodiment is used to carry out the Non-Destructive Testing of grape pol to kyoto grape sample to be measured, the SMA905 interface halogen tungsten lamp of the 15W that wideband light source 1 adopts lighting angle little, by the SMA905 interface 2 with embedded collimation lens 8, obtain the launching spot of 3mm, the grape microscope carrier 4 be fixed in stepper motor 12 rotating shaft adopts upper surface to be provided with the right cylinder of 8mm hemispherical groove, substantially guarantees that the hot spot of 3mm impinges upon in the equatorial positions of kyoto grape sample to be measured.Stepper motor 12 at darkroom 5 internal fixtion on fixed station 14, reduce the vibration caused when stepper motor 12 rotates, second interface 13 of embedded condenser lens 10 passes through to use SMA905 Interface Fiber 6 to be connected with SMA905 interface spectrometer 7, transmitted ray passes through the embedded collector lens 10 of 13 li, the second interface, assembling enters in SMA905 Interface Fiber 6, SMA905 interface spectrometer 7 is connected by USB data line with host computer 9, obtain stepper motor 12 and often rotate transmitted spectrum corresponding to a default step angle, preserve and be numbered by rotational order is ascending from 1.Host computer 9, controllor for step-by-step motor 11 are connected by control line with stepper motor 12, and stepper motor is rotated according to the angle of default step angle or setting.
Grape pol the cannot-harm-detection device of the present embodiment, by obtaining the max transmissive spectrum of grape sample to be measured and this spectrum being brought in corresponding mathematical model, draw the pol of glucose, the automatic acquisition of grape Sample Maximal transmitted spectrum position to be measured in the Non-Destructive Testing of grape pol can be realized, eliminate the impact that grape pip detects grape pol, improve the accuracy of detection of grape pol.
It should be noted that in grape pol Non-Destructive Testing described in the present embodiment that the use principle of the device eliminating grape pip impact is:
(1) open darkroom, grape sample to be measured is positioned on grape microscope carrier and keeps grape to stablize, close darkroom;
(2) use host computer to send certain pulse signal control step electric machine controller, arrange the step angle of stepper motor, PC control spectrum obtains software simultaneously, makes the transmitted spectrum obtained rotate synchronous with stepper motor;
(3) stepper motor is according to the step angle rotating 360 degrees arranged, and host computer preserves often rotating the transmitted spectrum corresponding to a step angle and being numbered according to rotational order is ascending from 1 of spectrometer acquisition;
(4) host computer contrast has completed the transmitted spectrum of serial number, find out the numbering that max transmissive spectrum is corresponding, use the rotation number of degrees of product as stepper motor of this numbering and step angle, this swing numerical control controllor for step-by-step motor of host computer, send corresponding pulses Driving Stepping Motor and rotate to this position, the transmitted spectrum preserved before simultaneously deleting;
(5) host computer preserves the transmitted spectrum of this position grape that spectrometer obtains, subsequently with this position for starting point, PC control controllor for step-by-step motor Driving Stepping Motor is equidirectional again to be revolved turnback and preserves the transmitted spectrum now that spectrometer obtains.
(6) host computer brings the transmitted spectrum preserved when rotating the determined rotation number of degrees at stepper motor and the transmitted spectrum preserved when stepper motor revolves turnback into default grape pol Non-Destructive Testing mathematical model, the grape pol of the grape sample to be measured of the grape pip that has been eliminated impact.
Fig. 2 shows a kind of grape pol lossless detection method based on the pol of grape shown in Fig. 1 the cannot-harm-detection device that one embodiment of the invention provides, and as shown in Figure 2, the grape pol lossless detection method of the present embodiment is as described below.
201, host computer sends the first pulse signal to controllor for step-by-step motor, to make described controllor for step-by-step motor according to described first pulse signal control step motor according to default step angle rotating 360 degrees, and obtain (and preserve) spectrometer and often rotate transmitted spectrum corresponding to a default step angle at described stepper motor according to what obtain during default step angle rotating 360 degrees, and the transmitted spectrum of acquisition is numbered according to rotational order is ascending from 1.
202, according to numbering corresponding to transmitted spectrum and the default step angle of the transmitted spectrum obtained, acquisition, the rotation number of degrees of stepper motor are determined.
203, according to the determined rotation number of degrees, the second pulse signal is sent to controllor for step-by-step motor, to make described controllor for step-by-step motor rotate the determined rotation number of degrees according to described second pulse signal control step motor according to sense of rotation during rotating 360 degrees, and obtain the transmitted spectrum that (and preserve) spectrometer now obtains.
204, the 3rd pulse signal is sent to controllor for step-by-step motor, to make described controllor for step-by-step motor revolve turnback according to described 3rd pulse signal control step motor according to sense of rotation during rotating 360 degrees, and obtain the transmitted spectrum that (and preserve) spectrometer now obtains.
205, the transmitted spectrum that the transmitted spectrum obtained when stepper motor rotates the determined rotation number of degrees according to spectrometer and spectrometer obtain when stepper motor revolves turnback, by the grape pol Non-Destructive Testing mathematical model preset, obtain the grape pol of the grape sample to be measured eliminating grape pip impact.
In a particular application, step 202 described in the present embodiment, can specifically comprise:
The transmitted spectrum of acquisition is contrasted, obtains the numbering corresponding to large transmitted spectrum, using the rotation number of degrees of the product of this numbering and default step angle as stepper motor.
The grape pol lossless detection method of the present embodiment, realize in host computer in the pol of grape shown in Fig. 1 the cannot-harm-detection device, the automatic acquisition of grape Sample Maximal transmitted spectrum position to be measured in the Non-Destructive Testing of grape pol can be realized, eliminate the impact that grape pip detects grape pol, improve the accuracy of detection of grape pol.
One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that programmed instruction is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of the claims in the present invention.
Claims (10)
1. grape pol the cannot-harm-detection device, it is characterized in that, comprising: the second interface of the first interface of wideband light source, embedded collimation lens, grape microscope carrier, darkroom, embedded condenser lens, optical fiber, spectrometer, host computer, controllor for step-by-step motor, stepper motor and fixed station;
Described darkroom has two unthreaded holes, be symmetricly set on the two sides that described darkroom is relative, described first interface is connected with described darkroom by first unthreaded hole, described second interface is connected with described darkroom by second unthreaded hole, described spectrometer is connected with described second interface by described optical fiber, described host computer respectively with described spectrometer, controllor for step-by-step motor connects, described controllor for step-by-step motor is connected with described stepper motor, described darkroom is arranged on described fixed station, described stepper motor at described darkroom internal fixtion on described fixed station, described grape microscope carrier is fixed in the rotating shaft of described stepper motor,
Wherein, the light that described wideband light source sends irradiates the grape sample to be measured that the described grape microscope carrier in described darkroom is placed by the collimation lens formation launching spot that described first interface is embedded; Light transmitted through described grape sample to be measured focuses on by described second interface embedded condenser lens, then by optical fiber by the light transmission after focusing on to described spectrometer; Described spectrometer obtains transmitted spectrum according to the light received, and described transmitted spectrum is sent to host computer; Described host computer controls the rotation of described stepper motor by described controllor for step-by-step motor, and obtains the transmitted spectrum synchronous with the rotation of described stepper motor of described spectrometer transmission.
2. device according to claim 1, is characterized in that, on the center line being centrally located at described first interface and described second interface of described collimation lens, described condenser lens and described grape sample to be measured.
3. device according to claim 1, is characterized in that, described grape microscope carrier is the right cylinder that upper surface is provided with hemispherical groove, and the lower surface of described grape microscope carrier is fixed in the rotating shaft of described stepper motor.
4. device according to claim 1, is characterized in that, described wideband light source is halogen tungsten lamp;
And/or,
Described spectrometer adopts visible and near infrared spectrum instrument.
5. device according to claim 1, is characterized in that, described first interface and the second interface are SMA905 interface;
Correspondingly, described wideband light source is SMA905 interface wideband light source, and described optical fiber is SMA905 Interface Fiber, and described spectrometer is SMA905 interface spectrometer.
6. device according to claim 1, is characterized in that, described optical fiber adopts silica fibre, and core diameter and numerical aperture are respectively 1mm and 0.48mm.
7. device according to claim 1, is characterized in that, the diameter of described collimation lens is 10mm, obtains the launching spot of 3mm;
And/or,
The diameter of described condenser lens is 10mm.
8. device according to claim 1, is characterized in that, described host computer is connected with described spectrometer by USB data line;
And/or,
Described fixed station is aluminum fixed station.
9., based on the grape pol lossless detection method of grape pol the cannot-harm-detection device according to any one of claim 1-8, it is characterized in that, comprising:
Host computer sends the first pulse signal to controllor for step-by-step motor, to make described controllor for step-by-step motor according to described first pulse signal control step motor according to default step angle rotating 360 degrees, and obtain spectrometer and often rotate transmitted spectrum corresponding to a default step angle at described stepper motor according to what obtain during default step angle rotating 360 degrees, and the transmitted spectrum of acquisition is numbered according to rotational order is ascending from 1;
The numbering corresponding according to the transmitted spectrum of the transmitted spectrum obtained, acquisition and default step angle, determine the rotation number of degrees of stepper motor;
According to the determined rotation number of degrees, the second pulse signal is sent to controllor for step-by-step motor, to make described controllor for step-by-step motor rotate the determined rotation number of degrees according to described second pulse signal control step motor according to sense of rotation during rotating 360 degrees, and obtain the transmitted spectrum that spectrometer now obtains;
Send the 3rd pulse signal to controllor for step-by-step motor, to make described controllor for step-by-step motor revolve turnback according to described 3rd pulse signal control step motor according to sense of rotation during rotating 360 degrees, and obtain the transmitted spectrum that spectrometer now obtains;
The transmitted spectrum that the transmitted spectrum obtained when stepper motor rotates the determined rotation number of degrees according to spectrometer and spectrometer obtain when stepper motor revolves turnback, by the grape pol Non-Destructive Testing mathematical model preset, obtain the grape pol of the grape sample to be measured eliminating grape pip impact.
10. method according to claim 9, is characterized in that, the numbering corresponding to transmitted spectrum of described transmitted spectrum according to obtaining, acquisition and default step angle, determines the rotation number of degrees of stepper motor, comprising:
The transmitted spectrum of acquisition is contrasted, obtains the numbering corresponding to large transmitted spectrum, using the rotation number of degrees of the product of this numbering and default step angle as stepper motor.
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| CN112649377A (en) * | 2020-12-28 | 2021-04-13 | 重庆电子工程职业学院 | Data acquisition device suitable for fruit sugar degree nondestructive test |
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