CN104374708B - Beef freshness detection device and detection method - Google Patents
Beef freshness detection device and detection method Download PDFInfo
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- CN104374708B CN104374708B CN201410406893.XA CN201410406893A CN104374708B CN 104374708 B CN104374708 B CN 104374708B CN 201410406893 A CN201410406893 A CN 201410406893A CN 104374708 B CN104374708 B CN 104374708B
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Abstract
The invention discloses a beef freshness detection device and detection method, the beef freshness detection device comprises an opaque housing, a halogen lamp, a spectrometer, a lifting platform arranged in the housing, a rectangular container which is arranged on the lifting platform and is provided with an opening at the upper end, a rectangular sample tray arranged in the container, a cross bar arranged in the housing, a light emitting head which is arranged on the cross bar and is used for irradiating light to a sample, a light receiving head for receiving reflected light of the sample, and a distance measuring sensor for measuring distance between the cross bar and the sample tray; and the beef freshness detection device has the advantages of fast detection speed, more detection points, and higher detection data reliability and precision.
Description
Technical field
The present invention relates to measurement techniques for quality detection of meat detection technique field, more particularly, to one kind cattle can be accurately and rapidly detected
The whether corrupt degree of beef freshness detection means of meat and its detection method.
Background technology
The characteristics of beef has nutritious and in good taste, it is deep to be liked by consumers in general.
But, beef is highly susceptible to pollute and go bad.During storage, with the propagation of microorganism and a series of
Physicochemical change, the freshness of beef is decreased.The abundant nutritional labeling quilt such as protein, fat and carbohydrate
Antibacterial and enzyme are utilized, and produce the sour gas of ammonia, sulfuration ammonia, aldehydic acid, aldehyde, ketone, ethanethio, alcohol and carboxylic acid.Metabolite
In aldehyde, ketone, ester and other low molecular compounds make beef produce abnormal flavour.
At present, generally sample is irradiated (i.e. using a normally opened laser instrument battle array using spectrum stimulus light source both at home and abroad
Row or LED are impinged upon on sample), and gather incident illumination and be mapped to diffusing after sample or the reflection through sample
Light, is analyzed to diffusing reflection spectrum or reflectance spectrum, finally realizes the detection to sample quality；But, the detection method
Have that collected detection information amount is less, the relatively low deficiency of the precision of detection.
Chinese patent Authorization Notice No.：CN101769889A, in authorized announcement date on July 7th, 2010, discloses a kind of agricultural production
The electric nasus system of product Quality Detection, including one mainly complete the gas enrichment module to low concentration odor trap, a main handle
Olfactory signal is converted into the air chamber gas path module and sensor array of the signal of telecommunication, and one is mainly carried out to sensor array output signal
Filtering, analog digital conversion, the Conditioning Circuits of Sensor of feature extraction and data preprocessing module, a pair of signals are identified and sentence
The disconnected and embedded system with data storage, one shows and result output module；Described gas enrichment module is by being filled with
The adsorption tube of adsorbent, heating wire and attemperating unit are constituted.The invention has single function, the deficiency of detection time length.
The content of the invention
The present invention is to overcome the shortcomings of that detection method precision of the prior art is low and time-consuming, there is provided Yi Zhongke
Accurately and rapidly to detect the whether corrupt degree of beef freshness detection means of beef and its detection method.
To achieve these goals, the present invention is employed the following technical solutions：
A kind of degree of beef freshness detection means, including light tight housing, Halogen light, spectrogrph, the lifting in housing
Platform, the rectangular vessel of the upper end open on hoistable platform, the rectangle sample pallet in container, in housing
Cross bar, on cross bar for the light emitting head of sample irradiation light, the light-receiving head of reflected light for receiving sample and
For detecting the distance measuring sensor of spacing between cross bar and sample tray；
Halogen light, the electrical connection of light emitting head, light-receiving head is electrically connected with spectrogrph, and hoistable platform is by screw mandrel and is located at shell
First motor of body bottom is connected；Container and sample tray are made by non-magnet_conductible material, and liquid, institute are provided with the container
State sample tray to be suspended on liquid surface, container bottom is provided with several vertical cores in m rank matrix arrangements, each vertical core to
Positioning electric magnet is equipped with upper shed and vertical core, positioning magnet piece is provided with the sample tray middle part, through sample
The metal column upper end of product pallet lower surface is connected with positioning with magnet piece, and positioning electric magnet and positioning use magnet piece opposite end
Magnetic pole opposite polarity；
Sample tray outward flange is provided with some pieces of traction magnet pieces, and container side is provided with some blocks of power for traction magnetic
Ferrum；Distance measuring sensor, spectrogrph, be equipped with each piece of positioning magnet piece, each block of power for traction Magnet and the first motor for
With the signal port for calculating mechatronics.
Being provided for of each vertical core positions to sample tray, when sample tray is moved at different vertical cores, light
Emitting head can be respectively radiated to the difference on sample, so as to the detection means of the present invention can be carried out to the multiple points on sample
Detection.
Gauged distance scope is previously provided with computer, between distance measuring sensor is used to detect between cross bar and sample tray
Away from, when amount of liquid is in critical field, the distance between cross bar and sample tray also in the range of gauged distance when, reflected light
Can enter in light-receiving head；When amount of liquid is more or less, incident illumination is irradiated on the point predetermined less than sample, the side of reflected light
To changing, reflected light cannot be introduced in light-receiving head；Therefore, when detection cross bar and sample tray between spacing do not exist
When in the range of gauged distance, computer can control the rotating shaft of the first motor and drive screw mandrel to rotate, so that moving down on hoistable platform
It is dynamic, so that it is guaranteed that normal detection.
Light detects the principle of degree of beef freshness：After a branch of light irradiation sample, due to being wrapped in different freshness samples
The different chemical feature groups for containing are different, therefore for the degree of absorption of different wave length incident illumination is different, thus
The intensity of each wavelength light is different in reflected light, therefore can be gone to characterize the freshness of sample according to these information.But, such as
The light intensity of fruit incident illumination is fixed, then incident illumination is stably radiated on sample, and each chemical group in sample is for difference
The degree of absorption of wavelength light is in saturation, although can be detected information, but quantity of information does not enrich, the standard of detection
Determine relatively low.
Therefore, the present invention has that detection speed is fast, and test point is more, the higher spy of the reliability and precision of detection data
Point.
Preferably, be equipped with the second motor in the container below each vertical core, each positioning electric magnet respectively with respectively
The vertical rotating shaft of individual second motor is connected, and on each positioning electric magnet keeper is equipped with, and each keeper upper end opens up
Have an x connected in stars, metal column lower end is provided with the x shape projection corresponding with x connected in stars, each second motor be provided with for calculating
The signal port of mechatronics.Metal column is provided with spring, and keeper is made using metal material.
Second motor is used to drive positioning to be horizontally rotated with electric magnet, and during rotation, x shapes projection can be embedded in x shapes
In groove, so as to drive sample tray to horizontally rotate, then in the detection process being located by connecting with the vertical core, detection is sample
Upper multiple continuous points.The sample message included in detection signal for obtaining is more, and it is more accurate to detect.
Preferably, also including light intensity adjusting means, the light intensity adjusting means includes data collecting card and power
Amplifier, the data collecting card be provided with for calculate mechatronics signal input interface, the data collecting card with
The input electrical connection of power amplifier, the outfan of the power amplifier and the power electric connection of Halogen light.
The light intensity adjusting means of the present invention is used to adjust the light intensity of the light source that laser array sends, in incident illumination
Gradually in big or reduction change procedure, absorption of the different groups to respective wavelength light is gradually big or reduces intensity, now
The degree of absorption of group includes more detection informations during unsaturation, saturation diminuendo, in reflected light, so as to make to obtain
Detection signal can more accurately symbolize the freshness of beef.
Computer produces the waveform for controlling intensity variation, and data collecting card exports the waveshape signal collection
To on power amplifier, the outfan of power amplifier and the power electric connection of laser array, so as to pass through to control laser instrument
The power supply of array realizes the regulation of the light intensity of the light source sent to laser array, and strong to sample irradiation by light emitting head
The incident illumination of degree change.
Preferably, the screw mandrel upper end is connected by bearing with hoistable platform, the pipe that screw mandrel lower end passes through lower end closed
Shape fixture is connected with housing, and eyelets are connected with wire rod thread.
Preferably, light emitting head and light-receiving head are connected respectively by montant with cross bar；Each piece of traction magnet piece
It is in bar shaped, the pole polarity on the outside of each piece of traction magnet piece is identical.
A kind of detection method of degree of beef freshness detection means, comprises the steps：
(6-1) according to CNS GB/T 5009.44-2003, the volatile salts of the different resting period beef samples of detection
Base nitrogen TVB-N values, and obtain and m2Individual sample detection point distinguishes corresponding freshness threshold SNRthre1, SNRthre1...,；
(6-2) distance is adjusted：By distance measuring sensor, the first motor respectively with calculate mechatronics, distance measuring sensor detection
Spacing between cross bar and sample tray, computer compares the spacing for detecting with default gauged distance scope, and root
Controlling the first motor according to result of the comparison drives screw mandrel to rotate, so that the spacing between cross bar and sample tray is located at normal pitch
In the range of；
(6-3) sample preparation：Lamellar meat is chosen from beef to be detected as detected sample；
(6-4) detected：Controller is electrically connected with spectrogrph, each block of positioning electric magnet and each block of power for traction Magnet
Connect, sample is kept flat on sample tray；
(6-4-1) controller is powered and power-off by giving each each block of positioning electric magnet and each block of power for traction Magnet,
Control sample tray is moved to each vertical core along bow font；
Whenever metal column is inserted after a vertical core, computer controls Halogen light and light emitting head are launched to sample irradiation
Light, light-receiving head receives reflected light, and spectrogrph receives detection signal Spect (t)；
(6-5) computer is to m2Individual detection signal Spect (t) does following data processing：
Detection signal Spect (t) is input into into one layer of accidental resonance model：
In, computer calculates first derivatives of the V (x, t, α) for x, second dervative and three order derivatives, and makes equation etc.
In 0, two layers of accidental resonance model are obtained：
Setting noise intensity D=0,Spect (t)=0, N (t)=0；The marginal value for being calculated A isThe marginal value of A is substituted in one layer of accidental resonance model, and sets X0(t)=0, sn0=0, with quadravalence jade for asking rain Ge Kuta
One layer of accidental resonance model of Algorithm for Solving, obtainsn
=0,1 ..., N-1
Wherein undetermined coefficient：
(k1)n=a (α xn-1(t))2-b(αxn-1(t))3+snn-1
Wherein, xn(t) for x (t) n order derivatives, snn-1It is value of the n-1 order derivatives of S (t) at t=0, snn+1It is S
Value of the n+1 order derivatives of (t) at t=0, n=0,1 ..., N-1；Obtain x1(t), x2(t) ..., xn+1The value of (t)；
Computer is to x1(t), x2(t) ..., xn+1T () is integrated, obtain x (t), and it is random common at one layer to obtain x (t)
The double-deck stochastic system of model and two layers of accidental resonance model composition of shaking produces time at optimal detection moment at accidental resonance moment
T1, optimum transient motion acceleration alpha 1, and determine the noise D1 corresponding to t1 and α 1；
Computer utilizes formulaCalculate the letter of double-deck stochastic resonance system output
Make an uproar ratio；Wherein, Δ U=a2/4b；Obtain m2Individual output signal-to-noise ratio SNRthre1, SNRthre1...,；
(6-6) computer utilizes formulaCalculate kth group pivoting angle data institute right
Output signal-to-noise ratio error QE answeredk, wherein, k=1 ..., m2；
Computer is calculated and meets QEkNumber M of≤5% output signal-to-noise ratio error1；Computer is calculated and meets QEk＞ 5%
Output signal-to-noise ratio error number M2；
If (6-7)Then computer makes the fresh judgement of sample；
IfThen computer makes the stale judgement of sample；
Otherwise, return to step (6-4-1), detects and carries out data processing again to sample.
Preferably, being equipped with the second motor in the container below described each vertical core, each positioning is distinguished with electric magnet
It is connected with the vertical rotating shaft of each the second motor, on each positioning electric magnet keeper is equipped with, each keeper upper end
Offer x connected in stars, metal column lower end is provided with the x shape projection corresponding with x connected in stars, each second motor be provided with for
With the signal port for calculating mechatronics；
In the detection process of (6-4-1), the computer controls motor corresponding with the vertical core that metal column is inserted turn
Axle drives sample tray rotation 1 to 2 all.
Preferably, it is described also include light intensity adjusting means, the light intensity adjusting means include data collecting card and
Power amplifier, the data collecting card is provided with for the signal input interface with calculating mechatronics, the data acquisition
Card is electrically connected with the input of power amplifier, the outfan of the power amplifier and the power electric connection of Halogen light；Step
(6-4-1) replaced by following step：
Whenever metal column is inserted after a vertical core, controller adjusts the inspection of Halogen light output by light intensity adjusting means
Light-metering, the detection light rises to maximum MAT from 0 according to sine curve, then declines according to sine curve from maximum MAT
To 0.
Preferably, the thickness of the lamellar meat is 33 to 68mm.
Preferably, the incident angle of light emitting head is 15 to 60 degree；The span of MAT is 100 luxs to 220 Le
Ke Si.
Therefore, the present invention has the advantages that：(1) detection speed is fast；(2) test point is more, detection data can
It is higher by property and precision.
Description of the drawings
Fig. 1 is a kind of structural representation of the container of the present invention and support；
Fig. 2 is a kind of structural representation of the sample tray of the present invention；
Fig. 3 is a kind of structural representation of metal column, vertical core, motor, positioning electric magnet and the keeper of the present invention；
Fig. 4 is a kind of theory diagram of the present invention；
Fig. 5 is the Strength Changes schematic diagram of the detection light of the present invention；
Fig. 6 is a kind of flow chart of embodiments of the invention 1.
In figure：Halogen light 1, spectrogrph 2, hoistable platform 3, container 4, sample tray 5, cross bar 6, light emitting head 7, light-receiving
8, distance measuring sensor 9, vertical core 10, positioning electric magnet 12, metal column 13, power for traction Magnet 14, the second motor 15, positioning
Part 16, x connected in stars 17, x shapes projection 18, computer 19, light intensity adjusting means 20, data collecting card 21, power amplifier 22,
Spring 23, the first motor 24, traction magnet piece 25, housing 26.
Specific embodiment
With reference to the accompanying drawings and detailed description the present invention will be further described.
Embodiment 1
Embodiment as shown in Figure 1 is a kind of degree of beef freshness detection means, including light tight housing 26, Halogen light 1, light
Spectrometer 2, the hoistable platform 3 in housing, the rectangular vessel 4 of the upper end open on hoistable platform, in container
Rectangle sample pallet 5, the cross bar 6 in housing, on cross bar for the light emitting head 7 of sample irradiation light, be used for
Receive the light-receiving head 8 of the reflected light of sample and the range finding for detecting spacing between cross bar and sample tray as shown in Figure 4
Sensor 9；
As shown in figure 4, Halogen light, light emitting head are electrically connected, light-receiving head is electrically connected with spectrogrph, and hoistable platform passes through silk
Bar is connected with the first motor 24 located at housing bottom；Container and sample tray are made of plastics, and water, sample are filled in container
Product pallet is suspended on liquid surface, and container bottom is provided with 16 vertical cores 10 in 4 rank matrix arrangements, and each vertical core is opened upwards
Positioning electric magnet 12 is equipped with mouth and vertical core, sample tray is provided with positioning magnet piece in middle part, through sample tray
The upper end of metal column 13 of lower surface is connected with positioning with magnet piece, and positioning electric magnet uses the magnetic of magnet piece opposite end with positioning
The opposite polarity of pole；
As shown in Fig. 2 sample tray outward flange is provided with 16 pieces of traction magnet pieces 25, container side is provided with 16 pieces of tractions
With electric magnet 14；Traction magnet piece can be with identical with the quantity of power for traction Magnet, it is also possible to different, as long as drawing sample enough
Product pallet is moved.
As shown in figure 4, the first motor, distance measuring sensor, spectrogrph, each piece of positioning magnet piece and each block of power for traction magnetic
Electrically connect with computer 19 on ferrum.
As shown in fig. 6, a kind of detection method of degree of beef freshness detection means, comprises the steps：
According to CNS GB/T 5009.44-2003, the volatile salts of the different resting period beef samples of detection
Base nitrogen TVB-N values, and obtain freshness threshold SNR corresponding with 16 sample detection point differencethre1, SNRthre1...,
SNRthre16；15.30 centimetres to 15.40 centimetres of gauged distance scope is provided with computer；
According to CNS GB/T 5009.44-2003, the volatile salts of the different resting period beef samples of detection
Base nitrogen TVB-N values, and obtain freshness threshold SNR corresponding with 8 sample detection point differencethre1, SNRthre1...,
SNRthre16；
Freshness threshold SNRthre1, SNRthre1..., SNRthre16The method of acquisition is as follows：
The total volatile basic nitrogen numerical value of the fresh beef that detection has just been slaughtered, beef is put in cold storage plant deposit after having detected
Storage, second day, takes out beef for the 3rd day ... ... and continues to detect the total volatile basic nitrogen numerical value of beef, has detected be put into every time
Store in cold storage plant, when the total volatile basic nitrogen numerical value of certain day sample is exceeded for the first time, then the sample of this day is adopted into following
Step is detected that 16 for obtaining SNR is freshness threshold SNRthre1, SNRthre1..., SNRthre16。
Freshness threshold is related to storage condition, and the beef sample to storing in certain temperature, pressure and humidity enters
Freshness threshold SNR obtained by row detectionthre1, SNRthre1..., SNRthre16, it is only used for detection and deposits under the same conditions
The freshness of the beef of storage.
Step 100, distance is adjusted：By distance measuring sensor, the first motor respectively with calculate mechatronics, distance measuring sensor inspection
The spacing surveyed between cross bar and sample tray, computer compares the spacing for detecting with default gauged distance scope, and
Controlling the first motor according to result of the comparison drives screw mandrel to rotate, so that the spacing between cross bar and sample tray is located at standard
In distance range；
Step 200, sample preparation：The thick lamellar meat of 40mm is chosen from beef to be detected as detected sample；
Step 300, is detected：By controller and spectrogrph, each block of positioning electric magnet and each block of power for traction Magnet
Electrical connection, sample is kept flat on sample tray；
Step 310, controller is powered and power-off by giving each each block of positioning electric magnet and each block of power for traction Magnet,
Order of the control sample tray along Fig. 1 shown in arrow is moved to each vertical core in bow font；
Whenever metal column is inserted after a vertical core, computer controls Halogen light and light emitting head are launched to sample irradiation
Light, light-receiving head receives reflected light, and spectrogrph receives detection signal Spect (t)；
Step 400, data processing：
Computer does following data processing to 16 detection signals Spect (t)：
Detection signal Spect (t) is input into into one layer of accidental resonance model：
In, wherein, V (x, t, α) is potential function, and x (t) is Brownian movement Particles Moving lopcus function, and a, b are the normal of setting
Number, ξ (t) is outer noise, and D is that, with the outer noise intensity of 0.01 stepping in the range of [01], N (t) grasps noise for interior,For periodic sinusoidal signal, A is signal amplitude, and f is signal frequency, and t is movement time,For phase place, if
Computer calculates first derivatives of the V (x, t, α) for x (t), second dervative and three order derivatives, and makes equation etc.
In 0, two layers of accidental resonance model are obtained：
Setting noise intensity D=0,Spect (t)=0, N (t)=0；The marginal value for being calculated A isThe marginal value of A is substituted in one layer of accidental resonance model, and sets X0(t)=0, sn0=0, with quadravalence jade for asking rain lattice storehouse
One layer of accidental resonance model of tower Algorithm for Solving, obtains
N=0,1 ..., N-1
And calculate undetermined coefficient：
(k1)n=a (α xn-1(t))2-b(αxn-1(t))3+snn-1
Wherein, xn(t) for x (t) n order derivatives, snn-1It is value of the n-1 order derivatives of S (t) at t=0, snn+1It is S
Value of the n+1 order derivatives of (t) at t=0, n=0,1 ..., N-1；Obtain x1(t), x2(t) ..., xn+1The value of (t)；
Computer is to x1(t), x2(t) ..., xn+1T () is integrated, obtain x (t), and it is random common at one layer to obtain x (t)
The double-deck stochastic system of model and two layers of accidental resonance model composition of shaking produces time at optimal detection moment at accidental resonance moment
T1, optimum transient motion acceleration alpha 1, and determine the noise D1 corresponding to t1 and α 1；D1A value in for D；D is in [0,1]
In the range of with a function of 0.01 loop cycle stepping, the value of D and time correlation, it is known that t1Moment, D1Determine that.
Computer utilizes formulaCalculate the letter of double-deck stochastic resonance system output
Make an uproar ratio；Wherein, AU=a2/4b；Obtain 16 output signal-to-noise ratio SNR1, SNR2..., SNR16；
Step 500, Error Calculation：
Computer utilizes formulaCalculate corresponding to kth group pivoting angle data
Output signal-to-noise ratio error QEk, wherein, k=1 ..., 16；
Computer is calculated and meets QEkNumber M of≤5% output signal-to-noise ratio error1；Computer is calculated and meets QEk＞ 5%
Output signal-to-noise ratio error number M2；
Step 600, judges：
IfThen computer makes the fresh judgement of sample；
IfThen computer makes the stale judgement of sample；
Otherwise, return to step 310, detect and carry out data processing again to sample.
M in the present embodiment1=14,Therefore, computer makes the fresh judgement of sample.
Embodiment 2
In embodiment 2,
As shown in figure 3, be equipped with the second motor 15 in the container below each vertical core, each positioning electric magnet respectively with
The vertical rotating shaft of each the second motor is connected, and on each positioning electric magnet keeper 16 is equipped with, each keeper upper end
X connected in stars 17 are offered, metal column lower end is provided with the x shape projection 18 corresponding with x connected in stars, and each second motor is provided with
For the signal port electrically connected with computer 19.Metal column is provided with spring 23.
As shown in figure 4, also including light intensity adjusting means 20, light intensity adjusting means includes data collecting card 21 and power
Amplifier 22, data collecting card is provided with for the signal input interface with calculating mechatronics, and data collecting card is put with power
The input electrical connection of big device, the outfan of power amplifier and the power electric connection of Halogen light.
Step 310 is replaced by following step：
Whenever metal column is inserted after a vertical core, controller adjusts the inspection of Halogen light output by light intensity adjusting means
Light-metering, as shown in figure 5, detection light rises to the lux of maximum 200 from 0 according to sine curve, then from the Le gram of maximum 200
This drops to 0 according to sine curve；In detection process, second electric corresponding with the vertical core that metal column is inserted of computer controls
The rotating shaft of machine drives sample tray to rotate 1 week.
Other results and method part in embodiment 2 are in the same manner as in Example 1.
It should be understood that the present embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it is to be understood that
After having read the content of instruction of the present invention, those skilled in the art can make various changes or modifications to the present invention, these etc.
Valency form equally falls within the application appended claims limited range.
Claims (5)
1. a kind of degree of beef freshness detection means, is characterized in that, including light tight housing（26）, Halogen light（1）, spectrogrph（2）,
Hoistable platform in housing（3）, the rectangular vessel of the upper end open on hoistable platform（4）, the square in container
Shape sample tray（5）, the cross bar in housing（6）, on cross bar for the light emitting head of sample irradiation light（7）、
For receiving the light-receiving head of the reflected light of sample（8）And for detecting the distance measuring sensor of spacing between cross bar and sample tray
（9）；
Halogen light, the electrical connection of light emitting head, light-receiving head is electrically connected with spectrogrph, and hoistable platform is by screw mandrel and is located at housing bottom
First motor in portion（24）It is connected；Container and sample tray are made by non-magnet_conductible material, and liquid, institute are provided with the container
State sample tray to be suspended on liquid surface, container bottom is provided with several vertical cores in m rank matrix arrangements, each vertical core（10）
It is equipped with positioning electric magnet in upward opening and vertical core（12）, in the sample tray middle part positioning Magnet is provided with
Block, through the metal column of sample tray lower surface（13）Upper end is connected with positioning with magnet piece, positioning electric magnet and positioning
With the opposite polarity of the magnetic pole of magnet piece opposite end；
Sample tray outward flange is provided with some pieces of traction magnet pieces（25）, container side is provided with some blocks of power for traction Magnet
（14）；Distance measuring sensor, spectrogrph, it is equipped with use on each piece of positioning magnet piece, each block of power for traction Magnet and the first motor
In with computer（19）The signal port of electrical connection.
2. degree of beef freshness detection means according to claim 1, is characterized in that, be all provided with the container below each vertical core
There is the second motor（15）, each positioning electric magnet is connected respectively with the vertical rotating shaft of each the second motor, and each positioning is used
Keeper is equipped with electric magnet（16）, each keeper upper end offers x connected in stars（17）, metal column lower end is provided with and x shapes
The corresponding x shape projections of groove（18）, it is equipped with each second motor for the signal port with calculating mechatronics.
3. degree of beef freshness detection means according to claim 1, is characterized in that, also including light intensity adjusting means
（20）, the light intensity adjusting means include data collecting card（21）And power amplifier（22）, set on the data collecting card
Have for the signal input interface with calculating mechatronics, the data collecting card is electrically connected with the input of power amplifier,
The outfan of the power amplifier and the power electric connection of Halogen light.
4. degree of beef freshness detection means according to claim 1, is characterized in that, the screw mandrel upper end is by bearing and liter
Drop platform connection, screw mandrel lower end is connected by the eyelets of lower end closed with housing, eyelets and wire rod thread
Connection.
5. the degree of beef freshness detection means according to claim 1 or 2 or 3 or 4, is characterized in that, light emitting head and light connect
Receive head to be connected with cross bar by montant respectively；Each piece of traction magnet piece is in bar shaped, on the outside of each piece of traction magnet piece
Pole polarity is identical.
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