CN203838249U - Nondestructive detection device used for measuring dielectric properties of tomatoes - Google Patents

Nondestructive detection device used for measuring dielectric properties of tomatoes Download PDF

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Publication number
CN203838249U
CN203838249U CN201420234259.8U CN201420234259U CN203838249U CN 203838249 U CN203838249 U CN 203838249U CN 201420234259 U CN201420234259 U CN 201420234259U CN 203838249 U CN203838249 U CN 203838249U
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China
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signal
circuit
tomato
detection
measuring
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CN201420234259.8U
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Chinese (zh)
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周传璘
肖永军
马洪华
赵娜
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Hubei Engineering University
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Hubei Engineering University
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Abstract

The utility model discloses a nondestructive detection device used for measuring dielectric properties of tomatoes, comprising a signal generator and a test box. The nondestructive detection device is characterized in that the device further comprises a sampling circuit, a signal conditioning circuit, a signal filtering circuit and a TMS320F28335 controller; the signal generator, a to-be-tested tomato in the test box, and the sampling circuit form a loop; a voltage signal generated by the signal generator is attenuated through the to-be-tested object and then connected with the input end of the signal conditioning circuit, and an output signal of the signal conditioning circuit is connected with the input end of the controller through the signal filtering circuit; and the signal generator can 0.2Hz-2MHz signal frequency. The nondestructive detection device used for measuring dielectric properties of tomatoes is simple in structure and low in cost; no finished LCR bridge test instrument needs to be adopted, and thus later-period data processing by a PC does not needs to be involved; and the device is easy to promote in the market.

Description

A kind of the cannot-harm-detection device of measuring for tomato dielectric property
Technical field
The utility model relates to a kind of pick-up unit, relates in particular to the pick-up unit of measuring tomato dielectric property.
Background technology
It is a kind of Dynamic Non-Destruction Measurement that development in recent years is got up that dielectric property detects, the degree of ripeness of carrying out fruits and vegetables judge and quality-screening in there is important researching value and huge application potential.At present dielectric property platform there is no the product of shaping, and is also the test macro based on building in laboratory for the detection of the dielectric property of fruits and vegetables.But existing test macro all adopts the LCR bridge test instrument of finished product, and it need to connect the data processing that PC is done the later stage, is unfavorable for directly realizing measurement and the demonstration of dielectric property in embedded system.
Number of patent application is that 200810044648.3 patent discloses a kind of method and device that utilizes dielectric property checking celery quality to change, and this device employing LCR bridge test instrument is measured.
Utility model content
For overcoming the problems referred to above, the utility model proposes a kind of the cannot-harm-detection device of measuring for tomato dielectric property.
The technical solution of the utility model is: a kind of the cannot-harm-detection device of measuring for tomato dielectric property, comprise signal generator, test box, it is characterized in that, also comprise sample circuit, signal conditioning circuit, signal filter circuit and TMS320F28335 controller; Tomato to be measured and sample circuit in signal generator, test box form a loop; The voltage signal that signal generator produces is connected with signal conditioning circuit input end after object under test decay, and signal conditioning circuit output signal is connected with controller input end through signal filter circuit; Signal generator can produce 0.2Hz-2MHz signal frequency.
Further, signal conditioning circuit comprises the amplifying circuit in proportion consisting of sampling precision resistance R, resistance R 2, capacitor C 1, adjustable resistance R3, operational amplifier; Adjustable resistance R3 feeds back to operational amplifier end of oppisite phase through resistance R 2 and the parallel circuit that capacitor C 1 forms by output signal; Operational amplifier in-phase end is through voltage stabilizing diode D1 ground connection, and operational amplifier end of oppisite phase is through resistance R ground connection.
Further, signal conditioning circuit comprises the amplifying circuit in proportion consisting of sampling precision resistance R, R2, C1, adjustable resistance R3, operational amplifier; Adjustable resistance R3 feeds back to operational amplifier end of oppisite phase through the parallel circuit of R2 and C1 formation by output signal; Operational amplifier in-phase end is through voltage stabilizing diode D1 ground connection, and operational amplifier end of oppisite phase is through resistance R ground connection.
Further, the low-pass filter of signal filter circuit for consisting of R4, C2, for filter away high frequency noise signal.
Further, the shielded box of test box for being made by iron sheet, test box contains symmetrical left battery lead plate, the right battery lead plate of placing.
Further, signal generator is used in triumph VC2002 type function signal generator.
The utility model has the advantage of: the utility model is simple in structure, expense is cheap, without the LCR bridge test instrument that adopts finished product, thereby does late time data processing without relating to PC, is easy to marketing.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model;
Fig. 2 is signal conditioning circuit of the present utility model, signal filter circuit figure;
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object with effect is easy to understand, below in conjunction with illustrating and specific embodiment, further set forth the utility model.
As shown in Figure 1, the cannot-harm-detection device that tomato dielectric property is measured comprises signal generator, test box, sample circuit, signal conditioning circuit, signal filter circuit and controller.
Signal generator is used in triumph VC2002 type function signal generator, and can produce signal frequency is 0.2Hz-2MHz, and it tests required medium wave or microwave signal for generation of dielectric property.
The test box 4 shielding iron sheet case that the rectangular parallelepiped of long 500mm, wide 300mm, high 300mm is made of serving as reasons, its inside is fixed with left battery lead plate 1, the right battery lead plate 2 that is symmetrical, is placed with determinand tomato 3 between the battery lead plate of left and right.The output signal that signal generator produces after tested case Interface Terminal 5 is connected to left battery lead plate 1 by Shielded Twisted Pair 6, and right battery lead plate 2 is connected with sample circuit input end through Shielded Twisted Pair 7 and test box Interface Terminal 5.
The voltage signal of the voltage signal that sample circuit produces for Real-time Collection signal generator gained after object under test decay.Tomato to be measured and sample circuit in signal generator, test box form a loop; Sample circuit is delivered to signal conditioning circuit by the determinand evanescent voltage signal collecting, and by signal filtering, delivers to controller.
Signal conditioning circuit and signal filter circuit amplify and amplitude limit for the determinand decay small signal to gathering, and filtering clutter disturbs.
Controller adopts high precision floating point processor TMS320F28335, and ADC peripheral hardware is contained in inside, can directly measure the voltage signal of collection.
Be illustrated in figure 2 signal conditioning circuit and signal filter circuit.
Signal conditioning circuit comprises the amplifying circuit in proportion consisting of sampling precision resistance R, resistance R 2, capacitor C 1, adjustable resistance R3, operational amplifier; Adjustable resistance R3 feeds back to operational amplifier end of oppisite phase through resistance R 2 and the parallel circuit that capacitor C 1 forms by output signal; Operational amplifier in-phase end is through voltage stabilizing diode D1 ground connection, and operational amplifier end of oppisite phase is through resistance R ground connection; Adjustable resistance R3 output reference voltage is obtained by voltage stabilizing diode D1.Voltage on sample resistance R is the dividing potential drop gained between itself and object under test.
The low-pass filter of signal filter circuit for consisting of resistance R 4, capacitor C 2, for filter away high frequency noise signal, output signal is Vout.Because TMS320F28335 requires the analog voltage range of input, be 0-3.3V, for preventing that signal input voltage from surpassing this value, utilize diode D2 to be provided with holding circuit, when output voltage is during higher than 3.3V, output voltage is forced 3.3V.
While being placed with determinand tomato in test box, can signalization generator generation Vpp be+5V, frequency is the sine voltage signal of 500Hz, this signal puts on battery lead plate, after decay to be measured, sampling end can take out the sampled voltage signal of 10-300mV, and this signal can form the direct current signal of 0.1V-3.3V through signal conditioning circuit, and this signal can directly be read and store by controller.Amplitude, frequency or the signal type of adjustable signal generator of while, can there is different variations in the output signal of control end collection.By this nondestructive detection system, can measure in real time the dielectric property of object under test.
More than show and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present utility model; under the prerequisite that does not depart from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.

Claims (7)

1. a cannot-harm-detection device of measuring for tomato dielectric property, comprises signal generator, test box, it is characterized in that, also comprises sample circuit, signal conditioning circuit, signal filter circuit and TMS320F28335 controller; Tomato to be measured and sample circuit in signal generator, test box form a loop; The voltage signal that signal generator produces is connected with signal conditioning circuit input end after object under test decay, and signal conditioning circuit output signal is connected with controller input end through signal filter circuit; Signal generator can produce 0.2Hz-2MHz signal frequency.
2. a kind of the cannot-harm-detection device of measuring for tomato dielectric property according to claim 1, it is characterized in that, signal conditioning circuit comprises the amplifying circuit in proportion consisting of sampling precision resistance R, resistance R 2, capacitor C 1, adjustable resistance R3, operational amplifier; Adjustable resistance R3 feeds back to operational amplifier end of oppisite phase through resistance R 2 and the parallel circuit that capacitor C 1 forms by output signal; Operational amplifier in-phase end is through voltage stabilizing diode D1 ground connection, and operational amplifier end of oppisite phase is through resistance R ground connection.
3. a kind of the cannot-harm-detection device of measuring for tomato dielectric property according to claim 1, is characterized in that, the low-pass filter of signal filter circuit for consisting of resistance R 4, capacitor C 2, for filter away high frequency noise signal.
4. a kind of the cannot-harm-detection device of measuring for tomato dielectric property according to claim 1, is characterized in that, the shielded box of test box for being made by iron sheet, and test box contains symmetrical left battery lead plate, the right battery lead plate of placing.
5. a kind of the cannot-harm-detection device of measuring for tomato dielectric property according to claim 1, is characterized in that, is also provided with holding circuit between signal filter circuit and controller.
6. a kind of the cannot-harm-detection device of measuring for tomato dielectric property according to claim 5, is characterized in that, holding circuit is diode D2.
7. a kind of the cannot-harm-detection device of measuring for tomato dielectric property according to claim 1, is characterized in that, signal generator is used in triumph VC2002 type function signal generator.
CN201420234259.8U 2014-05-09 2014-05-09 Nondestructive detection device used for measuring dielectric properties of tomatoes Active CN203838249U (en)

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CN201420234259.8U CN203838249U (en) 2014-05-09 2014-05-09 Nondestructive detection device used for measuring dielectric properties of tomatoes

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Application Number Priority Date Filing Date Title
CN201420234259.8U CN203838249U (en) 2014-05-09 2014-05-09 Nondestructive detection device used for measuring dielectric properties of tomatoes

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110320246A (en) * 2018-03-29 2019-10-11 田旭 Apple internal quality nondestructive measure apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110320246A (en) * 2018-03-29 2019-10-11 田旭 Apple internal quality nondestructive measure apparatus

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