KR20000060806A - Ultrasonic system for evaluating quality of fruits and vegetables - Google Patents

Abstract

PURPOSE: An ultrasonic inspection device for evaluating quality of fruits is provided to effectively injecting an ultrasonic wave to curved surfaces of fruits and uniformly maintain contact pressure between transducers and an inspecting element, thereby improving the reliability of quality evaluation. CONSTITUTION: An ultrasonic inspection device for evaluating quality of fruits includes a waveform analyzing computer(10) for performing various signal processing and evaluating quality of fruits by using software, a high output ultrasonic pulse transmitting and receiving device(11) for outputting an analogue ultrasonic signal by a transmitter in response to a measuring trigger signal of a receiver, and outputting an analogue ultrasonic response signal having an RF waveform by amplifying and filtering the response signal input from the receiver, a transmitting transducer(12) for providing the analogue ultrasonic signal while repeating expansion and retraction by reverse-piezo electric effect, a horn(13) for injecting the analogue ultrasonic signal to an object to measure, an inspecting element(14) permeating the analogue ultrasonic signal to fruits difficult for maintaining a uniform contact pressure manually, a receiving transducer(15) for providing an analogue ultrasonic response signal to the high output ultrasonic pulse transmitting and receiving device after performing piezo-electric function, a contact pressure controlling pneumatic element(16) maintain a uniform contact force between the transmitting and receiving transducers and the inspecting element, and an A/D converter(17) for outputting a digital ultrasonic response signal having information of the inspecting element.

Description

Ultrasonic testing device for evaluating the quality of fruits and vegetables inside

The present invention relates to an ultrasonic inspection device for evaluating the quality of fruits and vegetables, particularly to evaluate the presence or absence of internal cavities, fruit and immature, breakage or deterioration of internal tissues of fruits and vegetables, such as fruits and vegetables, whose shape is curved and difficult to maintain a constant contact pressure. The present invention relates to an ultrasonic inspection apparatus for evaluating the quality of fruits and vegetables composed of hardware and software.

In general, the audible frequencies of human ears at the audible frequency range from 20 to 20,000 times / second (Hz), and sound waves with frequencies above 20,000 Hz are called ultrasonic waves and are usually made of metal concrete at 500 kHz to 10 MHz. It is utilized for ultrasonic flaw detection. The human audible frequency ranges from 20 to 20,000 Hz, and the human ear responds most sensitively to a sound of about 4,000 Hz. Normally, as we age, the range of audible frequencies decreases.

Ultrasonic waves have a high linearity and permeability, so they are widely used in industries such as nondestructive testing, seabed topography, submarine tracking, and fetal location.

Audible sound is generated by moving vibration plates such as paper by the force of electrons, but ultrasonic waves are made of materials having a physical phenomenon called piezoelectricity. The reverse piezoelectric effect is that when a voltage is applied to a crystal oscillator, one of such materials, in a transmitting transducer, it is stretched in the crystal thickness direction according to the voltage (+) (-).

Receiving at the receiving transducer causes the ultrasonic wave transmitted through the process opposite to the transmission to vibrate the surface of the test specimen, which causes the vibrator to stretch and generate voltage between electrodes.

1 is a block diagram of a conventional ultrasonic inspection system for non-destructive inspection evaluation.

Referring to FIG. 1, the configuration diagram of the ultrasonic inspection system for non-destructive inspection evaluation is a waveform analysis computer 1, an ultrasonic pulse transceiver 2, a transmission transducer 3, an inspection body 4, a reception transducer ( 5) and an A / D converter 6.

The waveform analysis computer 1 sends a trigger signal to the ultrasonic pulse transceiver 2 and the transmitter of the ultrasonic pulse transceiver 2 provides the ultrasonic signal to the transmitting transducer 3.

The transmitting transducer 3 receives the ultrasonic signal and expands or contracts by a reverse piezoelectric effect to inject an analog ultrasonic signal into the test body 4 such as a metal material or concrete.

The receiving transducer 5 receives and detects an analog ultrasonic signal transmitted through the test body 4, and performs the function of the piezoelectric effect, while receiving the analog ultrasonic response signal carrying the information of the test body 4. Provided to the pulse transceiver (2).

The ultrasonic pulse transceiver 2 receives the analog ultrasonic response signal and performs an amplification and filtering function to provide an ultrasonic response signal having an RF (Radio Frequency) waveform to the A / D converter 6.

The A / D converter 6 receives the ultrasonic response signal of the RF waveform and performs A / D conversion to provide a digital ultrasonic response signal.

The computer 1 equipped with the ultrasonic inspection system software receives the digital ultrasonic response signal containing the information of the test object 4, analyzes the received waveform, analyzes and evaluates the propagation speed, the attenuation, and the like, and the inside of the test body 4. The presence or absence of defects and the degree of deterioration are evaluated.

The ultrasonic inspection system for evaluating the non-destructive inspection was applied to concrete, metal materials, animals, etc. as the test body (4), the ultrasonic test by contacting the transmission and reception transducers (3, 5) to the test body (4) by the most manual work Perform

However, the low-frequency piezoelectric wave of about 50 kHz requires high pressure transmission, and the shape of the curved surface is soft, and the fruits and vegetables of fruits and vegetables that are difficult to maintain a constant contact pressure, there is a problem that ultrasonic measurement is difficult.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to construct a low-frequency, high-power system that can be applied to fruits and vegetables having a curved shape and difficult to maintain a constant contact pressure, and effectively enter ultrasonic waves on any curved surface. It provides ultrasonic inspection device for quality evaluation of fruits and vegetables developed by Jig and signal analysis software to maintain the constant contact pressure between the transducer and the specimen to increase the reliability of the quality evaluation.

1 is a block diagram of a conventional ultrasonic inspection system for non-destructive inspection evaluation,

2 is a block diagram of an ultrasonic inspection apparatus for evaluating the inside quality of fruits and vegetables according to the present invention.

Explanation of symbols on the main parts of the drawings

10: waveform analysis computer 11: high power ultrasonic transceiver

12 Transmitting Transducer 13 Horn

14 test object 15 receiving transducer

16: Pneumatic mechanism for contact pressure adjustment 17: A / D converter

In order to achieve the above object, the present invention is equipped with the software for the ultrasonic inspection system and provides a trigger signal for measurement, and receives the digital ultrasonic response signal, the ultrasonic propagation speed, attenuation coefficient, peak frequency (Peak Frequency) ), Such as peak magnitude, bandwidth, etc., using the above software for waveform analysis to determine whether the fruits and vegetables are co-existing, ripe or not, based on quality grade and criteria A waveform analysis computer for performing various signal processing and inference functions for evaluating deterioration and the like and for evaluating internal quality of fruits and vegetables;

A high power ultrasonic pulse transceiving device for receiving the measurement trigger signal and providing an analog ultrasonic signal from a transmitter, and receiving and amplifying and filtering the analog ultrasonic response signal from the receiver to provide an analog ultrasonic response signal of an RF waveform;

Transmitting transducer for receiving the analog ultrasonic signal to provide an analog ultrasonic signal while repeating the expansion and contraction when the alternating voltage signal is applied to the vibrator by the reverse piezoelectric effect;

Ultrasonic waves are also propagated in the air, so they block the airwaves from the transmitting transducer to the receiving transducer. The ultrasonic waves are made of a structure and material that can respond to the surface shape of the object to be measured, such as fruits and vegetables. A horn for injecting the analog ultrasonic signal into the measurement target as a medium for delaying time;

A test body for transmitting the analog ultrasonic waves to fruits and vegetables as the object of measurement, such as fruits and vegetables, having a curved surface and having difficulty in maintaining a constant contact pressure by hand;

A reception transducer configured to receive and sense analog ultrasonic waves in which the information of the test object is received, and to provide the analog ultrasonic response signal to the high power ultrasonic transmitting and receiving apparatus by performing a function of the piezoelectric effect;

A pneumatic mechanism for adjusting a contact pressure for maintaining a constant contact force between the transmitting transducer and the receiving transducer and the test object; And

And an A / D converter for receiving an analog ultrasonic response signal of the RF waveform and converting the analog signal into a digital signal and outputting a digital ultrasonic response signal containing the information of the test object. It provides an ultrasonic inspection apparatus.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an ultrasonic inspection apparatus for evaluating the inside quality of fruits and vegetables according to the present invention.

The ultrasonic inspection apparatus for evaluating the inside quality of the fruits and vegetables is a waveform analysis computer 10, a high power ultrasonic transceiver 11, a transmission transducer 12, a horn 13, a test object 14, a reception transducer 15. And a pneumatic mechanism 16 for adjusting contact pressure and an A / D converter 17.

The waveform analysis computer 10 is equipped with software for an ultrasonic inspection system and provides a trigger signal for measurement.

The high power ultrasonic pulse transceiving device 11 has a maximum driving voltage of 1200 V, and receives the measurement trigger signal from a receiver and provides an analog ultrasonic signal to the transmitting transducer 12 from a transmitter.

The transmitting transducer 12 receives and senses the analog ultrasonic signal and applies an alternating voltage signal to the vibrator by a reverse piezoelectric effect to provide the detected analog ultrasonic signal to the horn 13 while repeating expansion and contraction. .

The horn 13 is a structure and material that can block the air waves flowing through the air from the transmitting transducer 12 to the receiving transducer 14, and can freely correspond to the surface shape of the test body 14 And a medium for delaying a response time for ultrasonic analysis, and receiving the sensed analog ultrasonic signal from the transmission transducer 12 and passing the horn 13 to the test object 14 such as fruits and vegetables. Analog ultrasound is incident on the

The test body 14 transmits the analog ultrasonic signal to the receiving transducer 15 through fruits and vegetables, such as fruits and vegetables, which are curved in shape and difficult to maintain a constant contact pressure.

The receiving transducer 15 receives an analog ultrasonic wave on which the information of the test object 14 is loaded, detects the piezoelectric effect, and provides the analog ultrasonic response signal to the high power ultrasonic transceiving device 11.

On the other hand, the pneumatic mechanism 16 for adjusting the contact pressure is used to maintain a constant contact force between the transmitting transducer 12 and the receiving transducer 15 and the test body 14.

The high power ultrasonic receiver 11 receives the analog ultrasonic response signal, amplifies and filters the analog ultrasonic response signal, and provides the analog ultrasonic response signal of the RF waveform to the A / D converter 17.

The A / D converter 17 receives the analog ultrasonic response signal of the RF waveform and performs A / D conversion to transmit the digital ultrasonic response signal containing the information of the test object 14 to the waveform analysis computer 10. do.

The waveform analysis computer 10 receives the digital ultrasonic response signal and uses the waveform analysis software for the ultrasonic inspection system for evaluating the quality of fruits and vegetables. The internal quality evaluation function of fruits and vegetables is carried out by performing various signal processing and inference functions to evaluate whether there are internal joints of fruits and vegetables to judge whether they have been heard or not, ripening, immature, internal damage, and deterioration. To perform.

As described above, the ultrasonic inspection device for assessing the quality of fruits and vegetables according to the present invention has a low frequency of about 50 kHz so as to be applicable to fruits and vegetables having a curved shape and hard to maintain a constant contact pressure. By constructing a low frequency, high power system that requires high pressure transmission, the contact pressure is kept constant so that the transducer can effectively transmit the ultrasonic wave to any curved surface, and the ultrasonic wave can be used to increase the reliability of the quality evaluation of the fruits and vegetables.

Ultrasonic inspection apparatus for evaluating the internal quality of fruits and vegetables according to the present invention constitutes a system that provides the performance of low frequency and high power using ultrasonic waves for fruits and vegetables having a curved shape and difficult to maintain a constant contact pressure. By creating an automated software retrieval system of the process, it can be used to determine the quality and grade of fruits and vegetables such as fruits and vegetables, and to determine the quality and grade of upper, middle and lower. There is.

Claims (1)

Software for ultrasonic inspection system is installed and provides the trigger signal for measurement and receives the ultrasonic wave response signal, ultrasonic propagation speed, attenuation coefficient, peak frequency, peak magnitude, bandwidth (Bandwidth), etc. Various signals for evaluating overkill, immature, internal breakdown, deterioration, etc. to judge the presence or absence of internal cavities and ripeness of fruits and vegetables according to quality grade and standards using the above software for waveform analysis. A waveform analysis computer 10 for performing processing and reasoning functions and for evaluating internal quality of fruits and vegetables; A high power ultrasonic pulse transceiving device for receiving an analog ultrasonic signal from a transmitter receiving the measurement trigger signal from a receiver, and amplifying and filtering the analog ultrasonic response signal from the receiver to provide an analog ultrasonic response signal of an RF waveform. 11); A transmission transducer 12 for receiving and sensing the analog ultrasonic signal and providing the analog ultrasonic signal while repeating expansion and contraction when an AC voltage signal is applied to a vibrator by a reverse piezoelectric effect; Since the ultrasonic waves propagate in the air, the ultrasonic wave is transmitted from the transmitting transducer 12 to the receiving transducer 14 so as to block air waves flowing through the air and to respond to the surface shape of the object to be measured, such as fruits and vegetables. A horn (13) for injecting the analog ultrasonic signal into the measurement target as a medium for delaying response time for analyzing ultrasonic waves; A test body (14) which transmits the analog ultrasonic waves to fruits and vegetables as the object of measurement, such as fruits and vegetables, whose shape is curved and difficult to maintain a constant contact pressure by hand; A receiving transducer (15) for receiving and sensing analog ultrasonic waves carrying information of the test object (14) and performing the function of the piezoelectric effect to provide the analog ultrasonic response signal to the high power ultrasonic transmitting and receiving device (11); A pneumatic mechanism (16) for adjusting the contact pressure for maintaining a constant contact force between the transmitting transducer (12) and the receiving transducer (15) and the test specimen (14); And And an A / D converter 17 for receiving an analog ultrasonic response signal of the RF waveform and converting the analog signal into a digital signal and outputting a digital ultrasonic response signal containing the information of the test object 14. Ultrasonic inspection device for quality evaluation of fruits and vegetables.