JPS61207964A - Object inspecting device by reflected sound wave - Google Patents

Abstract

PURPOSE:To execute efficiently and uniformly inspection by providing a comparing and operating means for comparing a spectrum feature data which is derived by an analyzing means, with a standard pattern which has been stored in a storage means, and outputting a data for showing a result of its comparison. CONSTITUTION:A sound wave is reflected at positions of each different depth of the inside of a canned food 13, respectively, in accordance with a difference of frequencies and inputted to a loudspeaker 8, and by an analyzing part 10, its spectrum feature data is derived successively at every sound wave of each frequency. On the other hand, in this case, based on an operation of a frequency selecting part 7, a standard pattern of every frequency is read out successively from a memory 2 and 3 and given to a comparing and operating part 11. In the comparing and operating part 11, the spectrum feature data of every frequency given from the analyzing part 10 and the standard pattern of each frequency of the memory 2 and 3 are compared successively, and a data for showing a result of the comparison is outputted by plural ways at every frequency. In a deciding part 12, weighting, a statistical processing, etc. are performed with regard to these data, and whether a defect exists in the contents of the canned food 13 or not is decided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for obtaining information regarding the quality of an object using sound waves as a medium.

[Conventional technology]

At the manufacturing stage of canned goods, when performing quality inspections on the contents of finished cans, such as whether there are any foreign substances mixed in or whether there are any shortages of contents, it is impossible to perform inspections based on appearance. In the past, skilled workers carried out inspections by holding cans in their hands and shaking them or hitting them with a stick to listen to the sound, relying on their empirical intuition.

[Problem that the invention seeks to solve]

However, such an inspection method is not only inefficient, but also has the problem that it is impossible to avoid a certain degree of individual variation in inspection results depending on the operator.

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide an inspection apparatus that can perform efficient and uniform inspection.

[Means and effects for solving the problem] The object inspection device according to the present invention includes a sound wave generating means for making a predetermined sound wave incident on the object to be inspected, and a means for receiving the sound wave reflected by the object to be inspected. analysis means for obtaining spectral characteristic data of the waveform of the audio signal, storage means for storing a standard pattern of the spectrum of the sound wave reflected by the object to be inspected, and spectral characteristic data obtained by the analysis means and the storage means. The present invention is characterized in that it includes a comparison calculation means for comparing the standard pattern stored in the image forming apparatus and a standard pattern stored in the image forming apparatus, and outputting data representing the comparison result.

When a given sound wave is incident on an object, the waveform of the sound wave reflected by the object changes depending on various factors related to the object, such as composition, mass, density, etc. Therefore, a standard pattern of the spectrum of a reflected sound wave corresponding to a state in which the inspection object has a predetermined composition, mass, density, etc. is stored in advance in the storage means, and the standard pattern of the spectrum of the reflected sound wave corresponding to the state in which the inspection object is found has a predetermined composition, mass, density, etc. By comparing the obtained spectral feature data with the stored content of the storage means by the comparison calculation means, information regarding the composition, mass, density, etc. of the inspection object (i.e., information regarding the quality of the inspection object) can be obtained. can.

In addition, if the standard pattern of the spectrum of reflected sound waves when a predetermined defect exists in the object to be inspected and the standard pattern of the spectrum of reflected sound waves when there is no defect in the object to be inspected are stored in the storage means. By comparing the obtained spectral feature data with both the standard pattern with no defects and the standard pattern with defects, it is possible to determine which one is more similar. It is possible to obtain more accurate information regarding the quality of

〔Example〕

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

The inspection device 1 performs a quality inspection on the contents of the completed canned goods 13. In the inspection device 1, the non-defective memory 2 indicates that the standard pattern of the reflected sound wave spectrum when there is no defect in the contents of the can 16 (that is, when the composition and amount of the contents are in accordance with the specifications) is the difference in the frequency of the incident sound wave. A plurality of patterns are stored in advance in correspondence with the above. In addition, in defective memory B, the standard pattern of the reflected sound wave spectrum when there is a defect in the contents of the can 16 (that is, when the contents are contaminated with foreign matter or the contents are insufficient) is the same as in memory 2. A plurality of patterns are stored in advance in correspondence with the difference in frequency.

The oscillator 4 outputs an electrical signal of a predetermined frequency, and the frequency is adjusted based on a signal applied to a control input. The output signal of the oscillator 4 is given to a speaker 6 via an amplifier 5. The speaker 6 outputs a sound wave having the same frequency and waveform as this output signal, and this sound wave is conveyed to the belt conveyor 14 and is incident on one can 13 passing a predetermined position A.

An address designation signal is given from the frequency selection section 7 to the memory 2 and the address manual input ADD, and a frequency control signal is also given from the frequency selection section 7 to the control input of the oscillator 4. The frequency selection unit 7 has the role of sequentially specifying each storage address of the memory 2 and O within the time it takes for one canned food to pass the position A, and sequentially outputs all standard patterns for each frequency from the memories 2 and 6. It also serves to sequentially adjust the frequency of the oscillator 4 so that the oscillator 4 outputs a signal with the same frequency as the frequency corresponding to the standard pattern currently being addressed.

The sound waves reflected by the can 16 passing through position A are input to the microphone 8 in the inspection device 1 . The microphone 8 outputs an electrical signal having the same frequency and waveform as this sound wave, and this signal is given to the analysis section 10 via the amplifier 9.

The analysis section 10 is for converting a given signal into a digital signal, performing spectrum analysis on the digital signal, and obtaining its spectral characteristic data. Analysis section 10
The spectral feature data obtained by The pattern is successively compared with the standard pattern and data representing the comparison result is output. This data is given to the determination section 12.

The determination unit 12 performs a final determination as to whether or not there is a defect in the contents of the canned food 16 that is the subject of inspection by subjecting the data provided by the comparison calculation unit 11 to appropriate weighting, statistical processing, etc. , which outputs a signal indicating the determination result.

In the inspection device 1 having the above configuration, when one canned food 13 is conveyed to the belt conveyor 14 and passes through position A, signals having different frequencies are generated based on the operation of the frequency selection section 7. Sound waves are sequentially output from the oscillator 4, and correspondingly, sound waves having different frequencies are sequentially output from the speaker 6 and enter the inside of the can 13. These sound waves are reflected at different depth positions inside the can 16 depending on the difference in their frequencies and are input to the speaker 8, and the analysis section 10 sequentially obtains spectral characteristic data for each sound wave of each frequency. . On the other hand, at this time, based on the operation of the frequency selection section 7, standard patterns for each frequency are sequentially read out from the memories 2 and 3 and provided to the comparison calculation section 11. As a result, the comparison calculation section 11
Then, the spectral feature data for each frequency given from the analysis unit 10 and the standard patterns for each frequency in the memories 2 and 3 are compared sequentially (that is, for each frequency among those of the same frequency), and the comparison result is A plurality of data representing each frequency are output.

The determining section 12 performs weighting, statistical processing, etc. on these plural data, and determines whether or not there is a defect in the contents of the canned food 13.

Thereafter, similar inspection processing is performed for each individual can 13 that is conveyed to the belt conveyor 14 and passes through position A.

〔Effect of the invention〕

As described above, according to the object inspection apparatus according to the present invention, information regarding the quality of the object to be inspected is obtained based on the waveform characteristics of the sound waves reflected by the object to be inspected.
It is possible to quickly obtain accurate information under objective testing standards. Therefore, by using the information obtained,
The presence or absence of defects in the object to be inspected can be determined accurately and efficiently, and the quality of the object to be inspected can also be appropriately and efficiently controlled.

[Brief explanation of drawings]

The figure shows an embodiment of an object inspection device according to the present invention. DESCRIPTION OF SYMBOLS 1... Inspection device, 2... Good memory, 3... Defective memory, 4... Transmitter, 5, 9... Amplifier, 6...
... Speaker, 7 ... Frequency selection section, 8 ... Microphone, 10 ... Analysis section, 11 ... Comparison calculation section,
12... Judgment section, 13... Canned goods, 14... Belt conveyor.

Claims (1)

[Scope of Claims] 1. Sound wave generation means for injecting predetermined sound waves into the object to be inspected; and analysis means for receiving the sound waves reflected by the object to be inspected and obtaining spectral characteristic data of the waveform of the received audio signal. and a storage means that stores a standard pattern of the spectrum of the sound wave reflected by the inspection object, and compares the spectral feature data obtained by the analysis means with the standard pattern stored in the storage means, and performs the comparison. 1. An object inspection device using reflected sound waves, comprising a comparison calculation means for outputting data representing a result. 2. The storage means stores a standard pattern of the spectrum of reflected sound waves when a predetermined defect exists in the object to be inspected, and a standard pattern of the spectrum of reflected sound waves when there is no defect in the object. An object inspection device using reflected sound waves according to claim 1.