CN111999389A - Device and method for detecting foreign matter inside container - Google Patents
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Abstract
The present disclosure relates to an apparatus for detecting foreign matter inside a container, the apparatus comprising: a container comprising a cavity and an opening; a controller; a detection tone generator emitting a detection tone signal associated with a resonance frequency of the container; a feedback audio receiver receiving a plurality of feedback audio signals in response to the detection audio signal, a feedback audio analyzer determining a resonance audio signal resonated by the container based on the received plurality of feedback audio signals; and a foreign object indicator for determining whether a foreign object is present in the container based on the resonance audio signal.
Description
Technical Field
The present disclosure relates to the field of acoustic detection, and in particular, to an apparatus and method for detecting foreign objects inside a container.
Background
In automated production, it is often necessary to detect the presence of foreign objects in a hollow container. The current empty pipe detection method mainly comprises manual inspection and sensor inspection. The manual inspection has high working strength and long time consumption, and is not beneficial to automatic production. The problems of high cost, complex installation and low detection precision under complex conditions exist in the sensor inspection.
For example, chinese utility model patent No. CN202676927U discloses an empty pipe foreign matter detection device, which detects whether there is a foreign matter in the empty pipe through an infrared sensing device. Specifically, the device comprises a support frame, a probe rod lifting device and an infrared detection sensing device; the upper end of support frame is fixed with work platform, installs the elevating gear that can reciprocate relatively work platform on the work platform, has the infrared detection sensing device that can carry out infrared detection at probe rod elevating gear's upper portion fixed mounting, installs the probe rod on the probe rod elevating gear of infrared detection sensing device's below, installs the composite mold backplate on the work platform of infrared detection sensing device below.
However, under the complex and strong interference condition, the interference intensity of the infrared detection device is large, and the test is not accurate.
With the development of acoustic technology, devices for ranging using ultrasonic waves have appeared. For example, chinese patent No. CN1820213A discloses such an ultrasonic distance measuring device. The device includes: an ultrasonic transducer capable of transmitting a resonance frequency or a change in resonance frequency and receiving a reflected wave generated by ultrasonic waves transmitted to a measurement target a plurality of times. The device determines the propagation time of the ultrasonic wave based on the delay time when receiving the ultrasonic wave of the received signal having the maximum intensity, and determines the distance to the measurement target based on the propagation time.
However, the device is not favorable for detecting foreign matters in the empty pipe, the detection time is long, and the error rate is high.
Therefore, there is an urgent need for a device that can detect foreign objects in an empty pipe even in the case of strong interference.
Disclosure of Invention
In the present disclosure, the following embodiments relate to an apparatus and method for detecting foreign substances within a container.
According to some embodiments of the present disclosure, there is provided an apparatus for detecting foreign matter inside a container, the apparatus including: a container comprising a cavity and an opening; a controller; a detection tone generator emitting a detection tone signal associated with a resonance frequency of the container; a feedback audio receiver receiving a plurality of feedback audio signals in response to the detection audio signal, a feedback audio analyzer determining a resonance audio signal resonated by the container based on the received plurality of feedback audio signals; and a foreign object indicator for determining whether a foreign object is present in the container based on the resonance audio signal.
According to some embodiments of the disclosure, the container comprises a tubular body, a cylinder, a cuboid, a cube.
According to some embodiments of the present disclosure, the resonant audio signal after resonating by the container has a greater intensity than the other feedback audio signals.
According to some embodiments of the present disclosure, the feedback audio signal includes at least a first feedback audio signal and a second feedback audio signal, wherein the first feedback audio signal is from the opening of the container, the second feedback audio signal is from the bottom of the container, a foreign object indicator, and whether a foreign object is present in the container is determined based on the first feedback audio signal and the second feedback audio signal.
According to some embodiments of the present disclosure, wherein the frequency range of the detected audio signal is fLTo fHWherein f isLRepresenting the lowest resonance frequency at which resonance of the container can be detected, fHRepresenting the highest resonance frequency at which resonance of the container can be detected.
According to some embodiments of the disclosure, the feedback audio receiver comprises a microphone and the detection audio generator comprises a speaker.
According to some embodiments of the present disclosure, wherein the feedback audio analyzer determines a feedback audio signal having a largest energy among the plurality of feedback audio signals as a resonance audio signal.
According to some embodiments of the present disclosure, wherein the foreign object indicator comprises a bi-color signal light, wherein the bi-color signal light flashes a red light in response to a determination that a foreign object is present within the container; the two-color signal lamp is normally on in response to determining that there is no foreign object in the container.
According to some embodiments of the present disclosure, the foreign object indicator includes a row of monochromatic signal lights arranged in sequence from the opening of the container to the bottom of the tube, the signal light at the opening of the container and the signal light corresponding to the position of the foreign object blink in response to determining that the foreign object is present in the container; in response to determining that there is no foreign matter in the container, the signal lamp at the bottom of the tube is always on, and other lamps are alternately and repeatedly blinked from the bottom of the tube to the opening of the container.
According to further embodiments of the present disclosure, there is provided a method of detecting a foreign object within a container, the container having a cavity and an opening, wherein the method comprises: the method includes emitting a detection audio signal associated with a resonance frequency of a container at an initial time, receiving a plurality of feedback audio signals, determining a resonance audio signal resonated by the container among the plurality of feedback audio signals, and determining whether there is a foreign object in the container based on the resonance audio signal.
According to other embodiments of the present disclosure, wherein the frequency range of the detected audio signal is fLTo fHWherein f isLRepresenting the lowest resonance frequency at which resonance of the container can be detected, fHRepresenting the highest resonance frequency at which resonance of the container can be detected.
According to further embodiments of the present disclosure, wherein the resonant audio signal after the container resonance has a greater intensity than the other feedback audio signals.
According to further embodiments of the present disclosure, the feedback audio signal includes at least a first feedback audio signal and a second feedback audio signal, wherein the first feedback audio signal is from the opening of the container and the second feedback audio signal is from the bottom of the container.
According to still further embodiments of the present disclosure, wherein the detection tone generator emits a frequency range fLTo fHDetecting an audio signal, wherein fLRepresenting the lowest resonance frequency at which resonance of the container can be detected, fHRepresenting the highest resonance frequency at which resonance of the container can be detected.
According to still further embodiments of the present disclosure, wherein the feedback audio receiver is in a frequency range of fLTo fHReceive a plurality of feedback audio signals from the container to be detected, wherein fLRepresenting the lowest resonance frequency at which resonance of the container can be detected, fHRepresenting the highest resonance frequency at which resonance of the container can be detected.
Other embodiments are possible, and each of the embodiments can be used alone or in combination together.
According to the embodiments of the present disclosure, foreign objects in an empty pipe can be accurately detected also in the case of strong interference. The technical problems that in the prior art, the detection process for detecting the foreign matters in the container is complex and the detection cost is high are solved.
Drawings
The accompanying drawings illustrate various aspects of the present invention and together with the description serve to explain its principles. For convenience, the same reference numbers will be used throughout the drawings to refer to the same or like elements.
FIG. 1A is a schematic diagram illustrating the principle of detecting foreign objects within a container according to an embodiment of the present disclosure
Fig. 1B is a schematic view illustrating a principle of detecting a position of a foreign object in a container according to another embodiment of the present disclosure.
Fig. 2 is a block diagram of an apparatus that may detect foreign objects within a container according to an embodiment of the present disclosure.
Fig. 3 is a schematic view of an apparatus for detecting foreign objects within a container according to some embodiments of the present disclosure.
FIG. 4 is a schematic view of an apparatus that may detect foreign objects within a container according to other embodiments of the present disclosure.
Fig. 5 is a waveform diagram illustrating a feedback audio receiver 404 receiving a feedback audio signal when performing foreign object detection within a receptacle according to further embodiments of the present disclosure.
Fig. 6 is a flow chart of a method of detecting foreign matter within a container according to some embodiments of the present disclosure.
FIG. 7 is a flow chart of a method of detecting foreign objects within a container according to other embodiments of the present disclosure.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings. The drawings of the present disclosure are provided to aid in understanding the present disclosure, and it should be noted that the present disclosure is not limited by the form, arrangement, and the like shown in the drawings of the present disclosure. In addition, details of known functions and configurations which make the subject matter of the present invention unclear may be omitted. In the following description, only necessary parts for understanding operations according to various embodiments of the present disclosure will be described, and other parts will not be described so as not to obscure the subject matter of the present disclosure.
Hereinafter, various embodiments will be described in detail with reference to the accompanying drawings. The embodiments and terms used herein are not intended to limit the present disclosure to specific embodiments, and they should be construed to include various modifications, equivalents, and/or alternatives to the embodiments according to the present disclosure. With respect to the description of the drawings, like reference numerals refer to like elements. The singular is also intended to include the plural unless the context clearly dictates otherwise. In the present disclosure, expressions such as "a or B", "at least one of a or/and B", or "one or more of a or/and B" may include all possible combinations of the items listed together. Expressions such as "first", "second", "primary", or "secondary" as used herein may refer to various elements, regardless of their order and/or importance, and do not limit the respective elements. When an element (such as a first element) is described as being "operably or communicatively coupled" or "connected" to another element (such as a second element), the element can be directly connected to the other element or can be connected to the other element by the other element (e.g., a third element).
The expression "configured to (or set)" used in the present disclosure may be replaced with, for example, "adapted to", "having a. Alternatively, in some cases, the expression "a device configured.. may mean that the device is" capable "of operating with another device or component. For example, the phrase "a processor configured (or arranged) to perform A, B, and C" may be a dedicated processor (e.g., an embedded processor) for performing the respective operations or a general-purpose processor (such as a Central Processing Unit (CPU) or an application processor) capable of performing the respective operations by executing at least one software program stored in a memory (or storage unit).
Definitions for certain other words and phrases are provided throughout this disclosure. Those of ordinary skill in the art should understand that in many instances, such definitions apply to prior as well as future uses of such defined words and phrases.
Figures 1 through 7, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the disclosure may be implemented in any suitably arranged device or method.
Fig. 1A is a schematic view illustrating a principle of detecting foreign substances in a container according to an embodiment of the present disclosure.
First, the principle of determining whether foreign objects exist in the container by emitting a detection audio signal related to the resonance frequency of the container and analyzing the feedback signal will be described in detail with reference to fig. 1A.
The apparatus 100 for detecting foreign objects in a container may include a controller 101, a container 102, a detection tone generator 103, a feedback tone receiver 104, a feedback tone analyzer 105, a foreign object indicator 106, and a power supply compartment 106.
Specifically, assume that the container 101 is a tubular container, the tube has a length L, and the inner diameter at the opening of the container is D. At time t0At this point, the detection tone generator 102 emits a detection tone signal having a frequency ranging from fLTo fHWherein f isLRepresenting the lowest resonance frequency at which resonance of the container can be detected, fHRepresenting the highest resonance frequency at which resonance of the container can be detected.
Specifically, according to the Helmholtz resonance (Helmholtz resonance) principle, when an acoustic wave is emitted toward a cavity at the natural frequency of the cavity, air will resonate in the cavity. For example, when air is blown into the mouth of an empty bottle, the empty bottle resonates, and a resonant sound wave with a large intensity is generated. The resonated sound waves have a large energy at the natural frequency of the empty bottle, while the sound waves of other frequencies have a small energy. Therefore, even in the case where the object to be measured is shaken due to the instability of the external environment, a clear feedback resonance audio can be obtained.
Based on the helmholtz resonance principle, the resonance frequency of the tubular hollow body container can be determined according to the following equation (3):
wherein fb is resonance frequency and the unit is Hz; c is the speed of sound, about 340 m/sec; d is the inner diameter of the opening of the container, and the unit is mm; v is the container volume and the unit is mm; leq is the equivalent length at the opening of the container in m.
Depending on the shape of the container, f can be determined by the skilled person according to the Helmholtz resonance principlebIn other cases. This disclosure will not be repeated.
When transmitting frequency to the container from the range of fLTo fHWhen detecting an audio signal, the container will be at a frequency fbThe feedback audio signal with larger intensity is fed back. While at other frequencies the strength of the fed back audio signal is less.
Thus, the frequency range is analyzed from fLTo fHThe feedback audio analyzer 105 may determine the frequency of the feedback audio with the greatest intensity as the resonance frequency of the container and the signal at the resonance frequency as the resonance audio signal. And from this frequency, the length of the tube can be deduced in reverse knowing the inner diameter at the container opening and the equivalent length at the container opening.
When foreign matter is present inside the container, the natural frequency of the container will change. The resonant frequency of the tank as determined by the feedback audio analyzer 105 will also vary. Therefore, when the detection audio signal is transmitted to the tank a plurality of times, when the frequency of the resonance audio signal determined by the feedback audio analyzer changes (for example, the frequency of the resonance audio signal becomes large), it can be determined that foreign matter is present in the tank.
Fig. 1B is a schematic view illustrating a principle of detecting a position of a foreign object in a container according to another embodiment of the present disclosure.
Referring to fig. 1B, it can be seen that when a foreign substance exists in the inside of the cavity of the container, the length of the cavity becomes shorter, the volume becomes smaller, and thus the frequency of the resonant audio signal decreases.
Therefore, further, based on the changed frequency of the resonant audio signal, the formula (3) can reversely deduce the position of the foreign object in the cavity to the position of the opening of the cavity.
Fig. 2 is a block diagram of an apparatus that may detect foreign objects within a container according to an embodiment of the present disclosure. The apparatus 200 for detecting foreign objects in a container may include a controller 201, a container 202, a detection tone generator 203, a feedback tone receiver 204, a feedback tone analyzer 205, a foreign object indicator 206, and a power supply compartment 206. Controller 201 may interface and control detection audio generator 203, feedback audio receiver 204\ feedback audio analyzer 205, foreign object indicator 206, power supply bin 206. The device may be powered by a power supply bin 206.
Alternatively, a control circuit portion of at least one of the detection tone generator 203, the feedback tone receiver 204, the feedback tone analyzer 205, and the foreign object indicator 206 may constitute a circuit compartment together with the controller 201.
The controller 201 may include at least one of: processing circuitry, a microprocessor or processor, and a computer readable medium storing computer readable program code (e.g., software or firmware) executable by, for example, a (microprocessor) processor, logic gates, switches, an application specific integrated circuit, a programmable logic controller, and an embedded microcontroller. The controller 201 may be configured with hardware and/or firmware to perform the various functions described below and shown in the flow diagrams. Also, some of the components shown in the figures that are internal to the controller may also be stored external to the controller, and other components may be used. Further, the phrase "operably communicating with … …" may mean communicating directly with … … or indirectly (wired or wireless) with … … through one or more components, which may or may not be shown or described herein.
The controller 201 may have various functions in addition to the specific functions described herein.
Generally, as used herein, detection tone generator 203, feedback tone receiver 204, feedback tone analyzer 205, and anomaly indicator 206 may be hardware or a combination of hardware and software. For example, each of the above components may comprise an application specific integrated circuit, a field programmable gate array, a circuit, a digital logic circuit, an analog circuit, a combination of discrete circuits, a gate, or any other type of hardware or combination thereof. Additionally or alternatively, each of the components described above may include memory hardware including instructions executable with a processor or processor circuitry to implement one or more of the features of each of the components described above. When any of the above components includes a portion of memory that includes instructions executable by a processor, the component may or may not include a processor. In some examples, each component described above may be only a portion of memory that includes instructions executable by a processor to implement the features corresponding to that component, without including any other hardware. Because the above-described components include at least some hardware even when the included hardware includes software, each of the above-described components may be interchangeably referred to as a hardware module.
Fig. 3 is a schematic view of an apparatus for detecting foreign objects within a container according to some embodiments of the present disclosure.
Referring to fig. 3, the detection tone generator 203 may emit a detection tone signal associated with a resonance frequency of the container under the control of the controller 201. In particular, the detection audio signal frequency range associated with the resonance frequency of the container may be from fLTo fHWherein f isLRepresenting the lowest resonance frequency at which resonance of the container can be detected, fHRepresenting the highest resonance frequency at which resonance of the container can be detected.
When the detection audio signal reaches the container, a certain frequency in the detection audio signal may be close to the natural frequency of the container, thereby causing resonance of the container.
The feedback audio receiver 204 will receive a plurality of audio signals (also referred to herein as feedback audio signals) reflected from the container. The feedback audio receiver 204 may convert the feedback audio signal into an electrical signal under the control of the controller 201.
The feedback audio receiver 204 sends the feedback audio signal converted into the electric signal to the feedback audio analyzer 205 for analysis processing. The feedback audio analyzer 205 determines a resonance audio signal after the container resonates based on the received plurality of feedback audio signals. Specifically, the feedback audio analyzer determines a signal having the greatest intensity among the plurality of feedback signals as the resonance audio signal. The feedback audio analyzer may send the frequency of the resonant audio signal as one of the parameters to the foreign object indicator.
FIG. 4 is a schematic view of an apparatus that may detect foreign objects within a container according to other embodiments of the present disclosure. Fig. 5 is a waveform diagram illustrating a feedback audio receiver 404 receiving a feedback audio signal when performing foreign object detection within a receptacle according to further embodiments of the present disclosure.
As shown in fig. 4, the audio signal emitted from the detection tone generator 403 reaches the container opening and then returns from the container opening to the feedback tone receiver 404. From the velocity versus distance equation (1):
c=2⨉D/T (1)
where c represents the speed of sound and T represents the time from the emission of the sound to the reception of the feedback sound. From equation (1), it can be determined that the distance of the detected audio signal from a certain position of the container 402 to the feedback audio receiver 404 is:
D=c*T/2 （2）
assume that the feedback audio receiver 404 is at time t1A feedback audio signal is received from the container opening. Will t1The distance from the container opening to the feedback audio receiver 404 is obtained by substituting T. I.e. an internal diameter at the opening of the container of D = c t1/2
Similarly, the audio signal emitted from the detection tone generator 403 reaches the bottom of the container 402 and then returns from the bottom to the feedback tone receiver 404. Assume that the feedback audio receiver 404 is at time t2A feedback audio signal is received from the bottom of the container. The length in the container can be determined to be L = c t2/2。
Assuming that there is a foreign object in the container, the feedback audio receiver 404 is at time t3Receiving a feedback audio signal from the bottom of the container, determining the distance L' = c t from the opening of the container to the foreign object3/2。
Thus, it can be determined that foreign matter exists in the container when L' < L. And the specific position of the foreign matter in the container can be determined according to the distance from the opening of the container to the foreign matter.
According to fig. 5, it is assumed that the feedback audio receiver 404 receives a total of two signals, both of which are feedback signals that detect reflections of the audio signal back to the feedback audio receiver 404 after reaching the container. Wherein at time t1The feedback audio signal received at from the opening of the container may be referred to as a first feedback audio signal at time t2The feedback audio signal received at (a) may be referred to as a second feedback audio signal from the pipe bottom.
The feedback audio receiver 404 may convert the feedback audio signal into an electrical signal under the control of the controller 401.
The feedback audio receiver 404 transmits the feedback audio signal converted into the electric signal to the feedback audio analyzer 405 for analysis processing.
Specifically, the analysis processing for the feedback audio signal includes: based on the two adjacent feedback audio signals recorded by the feedback audio receiver 404, a time difference between the two received feedback audio signals is calculated. From the above equations (1) to (2), it can be determined that foreign matter exists in the container when the difference between t2 and t1 is smaller than the determined threshold value. And the distance from the opening of the container to the foreign matter can be deduced by using formula (2) according to t2, and the specific position of the foreign matter in the container can be determined.
According to some embodiments of the present disclosure, the foreign object indicator may include a two-color signal light, wherein the two-color signal light flashes a red light when it is determined that a foreign object is present in the container; when the container is determined to be free of foreign matters, the green light of the two-color signal lamp is normally on. According to other embodiments of the present disclosure, the foreign object indicator may further include a row of monochromatic signal lights, the monochromatic signal lights are sequentially arranged from the opening of the container to the bottom of the tube, and when it is determined that a foreign object is present in the container, the signal light located at the opening of the container and the signal light corresponding to the position of the foreign object blink; when it is determined that there is no foreign matter in the container, the signal lamp at the bottom of the tube is always on, and other lamps are alternately and repeatedly blinked from the bottom of the tube to the opening of the container.
Fig. 6 is a flow chart of a method of detecting foreign matter within a container according to some embodiments of the present disclosure.
Referring to fig. 6, in step 601, a detection audio signal associated with a resonant frequency of the container is emitted. In particular, the detection audio signal frequency range associated with the resonance frequency of the container may be from fLTo fHWherein f isLRepresenting the lowest resonance frequency at which resonance of the container can be detected, fHRepresenting the highest resonance frequency at which resonance of the container can be detected.
When the detection audio signal reaches the container, a certain frequency in the detection audio signal may be close to the natural frequency of the container, thereby causing resonance of the container.
In step 602, a plurality of audio signals reflected from a container (also referred to herein as feedback audio signals) are received and converted into electrical signals.
In step 603, a plurality of feedback audio signals are analyzed and processed. For example, a resonant audio signal after resonating the container is determined based on the received plurality of feedback audio signals. Specifically, the signal with the greatest intensity among the plurality of feedback signals may be determined as the resonant audio signal.
In step 604, it may be determined whether there is a foreign object inside the container based on the resonant audio signal. Specifically, when the frequencies of the resonance audio signals determined twice are different, or when the difference between the frequencies of the resonance audio signals determined twice is larger than a threshold value, it can be determined that a foreign substance is present inside the container. Alternatively, according to other embodiments of the present application, the location of the foreign object inside the container may be determined according to the changed frequency of the resonant audio signal.
FIG. 7 is a flow chart of a method of detecting foreign objects within a container according to other embodiments of the present disclosure.
Referring to fig. 7, in step 701, a detection audio signal associated with a resonance frequency of a container is emitted. In particular, the detection audio signal associated with the resonance frequency of the container may be a signal that may cause the container to resonate. For example, when the detection audio signal reaches the container, a certain frequency in the detection audio signal may be close to the natural frequency of the container, thereby causing resonance of the container.
In step 702, a plurality of audio signals reflected from a container (also referred to herein as feedback audio signals) are received and converted to electrical signals.
In step 703, a plurality of feedback audio signals are analyzed and processed. For example, based on the recorded adjacent two feedback audio signals, a time difference between the received two feedback audio signals is calculated.
In step 704, it may be determined whether there is a foreign object inside the container based on the resonant audio signal. Specifically, when the time difference between the received two feedback audio signals is calculated to be greater than the threshold value, it can be determined that a foreign object exists inside the container. Alternatively, according to other embodiments of the present application, the position of the foreign object inside the container may be determined from the time difference between the two feedback audio signals.
While the disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (8)
1. An apparatus for detecting foreign matter inside a container, the apparatus comprising:
a container comprising a cavity and an opening;
a controller;
a detection tone generator emitting a detection tone signal associated with a resonance frequency of the container;
a feedback audio receiver receiving a plurality of feedback audio signals in response to the detection audio signal,
a feedback audio analyzer that determines a resonance audio signal resonated by the container based on the received plurality of feedback audio signals;
a foreign object indicator for determining whether a foreign object is present in the container based on the resonance audio signal;
wherein the container comprises a tubular body, a cylinder, a cuboid and a cube;
wherein the intensity of the resonant audio signal after the resonance of the container is greater than that of other feedback audio signals;
wherein the feedback audio signals comprise at least a first feedback audio signal and a second feedback audio signal, wherein the first feedback audio signal is from the opening of the container and the second feedback audio signal is from the bottom of the container,
a foreign object indicator that determines whether a foreign object is present in the container based on the first feedback audio signal and the second feedback audio signal;
wherein the frequency range of the detected audio signal is fL to fH, where fL represents the lowest resonance frequency at which resonance of the tank can be detected and fH represents the highest resonance frequency at which resonance of the tank can be detected.
2. The apparatus of claim 1, wherein,
the feedback audio receiver comprises a microphone and the detection audio generator comprises a speaker.
3. The device of claim 1, wherein
The feedback audio analyzer determines a feedback audio signal having a maximum energy among a plurality of feedback audio signals as a resonance audio signal.
4. The apparatus of claim 1, wherein the foreign object indicator comprises a bi-color signal light, wherein,
the bicolor signal lamp flashes red light in response to determining that foreign matter is in the container;
the two-color signal lamp is normally on in response to determining that there is no foreign object in the container.
5. The apparatus of claim 1, wherein the foreign object indicator comprises an array of monochromatic signal lights,
the monochromatic signal lamps are arranged in sequence from the opening of the container to the bottom of the tube,
when the foreign matters are determined to exist in the container, the signal lamp positioned at the opening of the container and the signal lamp corresponding to the position of the foreign matters flicker;
in response to determining that there is no foreign matter in the container, the signal lamp at the bottom of the tube is always on, and other lamps are alternately and repeatedly blinked from the bottom of the tube to the opening of the container.
6. A method of detecting foreign matter inside a container, the container having a cavity and an opening, wherein the method comprises:
emitting a detection audio signal associated with a resonant frequency of the container at an initial time,
a plurality of feedback audio signals are received,
determining a resonance audio signal after the container resonates among the plurality of feedback audio signals,
determining whether there is a foreign object in the container based on the resonant audio signal;
wherein the frequency range of the detected audio signal is fL to fH, where fL represents the lowest resonance frequency at which resonance of the tank can be detected and fH represents the highest resonance frequency at which resonance of the tank can be detected;
wherein, the intensity of the resonance audio signal after the resonance of the container is greater than that of other feedback audio signals;
wherein the feedback audio signals comprise at least a first feedback audio signal and a second feedback audio signal, wherein the first feedback audio signal is from the opening of the container and the second feedback audio signal is from the bottom of the container.
7. A detection tone generator, wherein the detection tone generator emits a detection tone signal having a frequency range fL to fH, wherein fL represents the lowest resonance frequency at which tank resonance can be detected and fH represents the highest resonance frequency at which tank resonance can be detected.
8. A feedback audio receiver, wherein the feedback audio receiver receives a plurality of feedback audio signals from a tank to be detected over a frequency range fL to fH, wherein fL represents a lowest resonance frequency at which tank resonance can be detected and fH represents a highest resonance frequency at which tank resonance can be detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010917530.8A CN111999389A (en) | 2020-09-03 | 2020-09-03 | Device and method for detecting foreign matter inside container |
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