KR100951104B1 - Light pan screen sensing apparatus for detecting small objects and method thereof - Google Patents

Abstract

PURPOSE: A light pan screen sensing apparatus for detecting micro-objects and a method thereof are provided to minimize an error in counting the number of micro-objects by determining whether pulse signals are created by one micro-object. CONSTITUTION: A light pan screen sensing apparatus for detecting micro-objects comprises a light pan screen transmitter(110), a light pan screen receiver(120), a signal processor(130), and a controller(140). The light pan screen transmitter creates an infrared light pan screen for sensing a micro-object using a screen array and transmits the infrared light pan screen to the light pan screen receiver. The light pan screen receiver receives the infrared light pan screen and outputs an electric signal from the infrared light pan screen. The signal processor detects an AC signal corresponding to micro voltage from the signal outputted from the light pan screen receiver.

Description

LIGHT PAN SCREEN SENSING APPARATUS FOR DETECTING SMALL OBJECTS AND METHOD THEREOF}

The present invention relates to light film sensing, and more particularly, to generate a film for sensing micro-objects such as flower seeds, seeds of grains, and the like, and to convert an AC signal corresponding to a change in an electrical signal generated according to a change in the generated film. It converts the pulse signal, which is a micro-object detection signal, and removes the pulse signal corresponding to the bad signal from the converted pulse signal through software processing, thereby minimizing an error that may occur in sensing the micro-object, and thereby the sensing device. The present invention relates to an optical film sensing device and method for sensing a micro-object that can improve the reliability of the count of the micro-object when the micro-object sensing signal outputted from the micro-object is counted.

In general, the count of micro-objects is a micro-object placed on a weighing table after weighing a certain amount of weight with the development of the latest weighing technology and calculating the unit weight by dividing the weight by the number. The method of count scale is used to automatically calculate the number using the weight of.

However, the coefficient of counting method has a disadvantage that the coefficient of error is small when the unit weight of micro-materials such as precision processing parts or semiconductor devices is constant, but the accumulation error may be serious when the size and weight are not constant such as grains. have.

In addition, when packaging small number of small breeds, such as flower seeds have to be counted by hand manually after packing, there are difficulties in many aspects, such as time and personnel.

In order to solve the problem of the counting scale method, a linear light sensing method is conventionally used.

The linear light sensing method is to count the micro-objects passing through the linear light after generating the linear light. Such linear light sensing method may be affected by the ambient light emitted by the surroundings, resulting in narrowing between the sensors and at the same time. There is a problem that the object can not be detected, small minute objects are not sensed and the response speed is slow.

An object according to an embodiment of the present invention, which was devised to solve the above problems, is to detect a bad signal which is an AC signal which may be generated by noise or the like among the AC signals corresponding to a change in an electrical signal for a micro object passing through a light film. By removing the present invention, there is provided a light film sensing apparatus and method for sensing a micro object that can increase the accuracy in sensing the micro object passing through the light film.

Another object according to an embodiment of the present invention, by increasing the accuracy of the sensing of the micro-objects using the optical film, the optical film sensing device for detecting the micro-objects that can improve the reliability of the coefficient in counting the micro-objects and To provide that method.

Furthermore, the present invention, by receiving the size information of the micro-objects passing through the light film, and determining whether or not a bad signal according to the size information of the selected micro-objects, even if the size of the micro-objects to be sensed is changed for each of the micro-objects The present invention provides a film sensing device and a method for sensing a micro object that can increase the sensing accuracy and minimize an error that may occur when counting according to a change in the size of the micro object.

In order to achieve the above object, the optical film sensing apparatus according to an aspect of the present invention, the film film transmitting unit for generating and transmitting a film using a screen array composed of a plurality of infrared light emitting elements for sensing a micro-object; A light film receiver for receiving a light film transmitted from the light film transmitter and outputting a predetermined voltage thereto, and outputting a small voltage corresponding to a change of an electrical signal according to the change of the light film when the micro object passes through the light film; Detects an AC signal corresponding to the minute voltage output from the optical film receiving unit, compares the detected AC signal with a preset reference level, and detects the detected AC signal with a pulse width corresponding thereto. A signal processor converting the signal and outputting the signal; And comparing a pulse width of the pulse signal output from the signal processor with a preset pulse width range, and outputting a detection signal indicating the detection of the micro-object if within the pulse width range, and out of the pulse width range. It may include a control unit for preventing the output of the detection signal by determining the signal as a bad signal.

Further, the control unit is selected from any one of the predetermined size of the micro-object, the pulse width range corresponding to the size of the selected micro-object among the pulse width ranges differently set by the predetermined size of the micro-object and the The pulse widths of the pulse signals output from the signal processor may be compared.

The optical film receiver may include a solar cell device, and may receive the optical film transmitted from the optical film transmitter by using the solar cell device.

The signal processor may convert the plurality of AC signals into one pulse signal having a corresponding pulse width when the plurality of AC signals are within a predetermined time so as to be recognized as one micro object.

Furthermore, when the time interval between the pulse signals output from the signal processor is determined to be within a preset time, the controller determines the pulse signals as one pulse signal to determine a pulse width and the preset pulse width for the one pulse signal. Pulse width ranges can be compared.

According to an aspect of the present invention, there is provided a method for sensing a film, including: generating and transmitting a film for sensing a micro object; Receiving the optical film and outputting an electrical signal thereto; Detecting an AC signal corresponding to a change of the electrical signal generated when the micro-object passes through the optical film; Comparing the AC signal with a preset reference level and converting the AC signal into a pulse signal having a pulse width corresponding thereto when the AC signal is equal to or greater than the reference level; Calculating a pulse width of the pulse signal; Comparing the calculated pulse width with a preset pulse width range; And outputting a detection signal indicating the detection of the micro-object when the calculated pulse width is within the pulse width range, and determining the pulse signal as a bad signal when the pulse width is out of the pulse width range. Preventing.

Furthermore, the method may further include receiving any one of predetermined sizes of the micro-objects, and comparing the micro-objects with a size of the selected micro-objects among pulse width ranges differently set according to predetermined sizes of the micro-objects. The pulse width range corresponding to the size of the selected micro-object may be compared with the pulse width of the pulse signal by searching the corresponding pulse width range.

In the calculating step, when the time interval between the pulse signals is determined to be within a preset time, the pulse signals may be determined as one pulse signal to calculate a pulse width for the one pulse signal.

Other objects and features of the present invention in addition to the above objects will be apparent from the description of the embodiments with reference to the accompanying drawings.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, detailed descriptions of related well-known configurations or functions are omitted.

Hereinafter, an optical film sensing device and a method for sensing a micro-object according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6.

1 illustrates a configuration of an optical film sensing device for sensing a micro object according to an embodiment of the present invention.

Referring to FIG. 1, the optical film sensing apparatus includes a optical film transmitter 110, a optical film receiver 120, a signal processor 130, and a controller 140.

The optical film transmitter 110 generates a optical film for sensing a micro object and transmits the optical film to the optical film receiver 120. The optical film transmitter 110 includes a plurality of infrared light emitting elements (IRLEDs) 111 to generate an infrared optical film. array).

That is, the optical film transmitter 110 forms a screen array by connecting the plurality of infrared light emitting elements 111 in parallel, and generates an infrared optical film by transmitting power to the configured screen array, and transmits the infrared light film to the optical film receiver 120.

At this time, the film transmitting unit 110 is preferably configured to flow the most suitable current through a constant current circuit configuration, by using a small voltage corresponding to the change in the electrical signal generated when the micro-objects pass through the film. In order to sense micro-objects, it must be supplied with stable power.

In addition, the optical film transmitter 110 may be provided with a means for fine-tuning the generated infrared optical film, may be provided with an over-current protection means for preventing damage to the infrared light emitting element that may be generated by the overcurrent, According to the present invention, an overcurrent generating light emitting device may be provided to visually transmit the overcurrent to the user.

The optical film receiver 120 receives the infrared optical film transmitted from the optical film transmitter 110 and outputs an electrical signal thereof.

In this case, the optical film receiver 120 may include a solar cell element 121 that receives an infrared optical film and outputs an electrical signal thereof.

That is, the optical film receiver 120 outputs a predetermined voltage when no change occurs in the infrared light film by using the solar cell element 121, and when the change occurs in the infrared light film by the micro object, the electric wave is changed according to the wave change of the light. A change in the signal occurs, and a corresponding number of micro voltages are output. Here, the minute voltage may refer to a difference from a predetermined voltage.

The optical film receiver 120 may have a different magnitude of the minute voltage output according to the size of the micro-object passing through the infrared light film.

The signal processor 130 detects an AC signal corresponding to a small voltage, which is a change signal, from the signal output from the optical film receiver 120, uniformly amplifies the detected AC signal, and shapes a waveform, and performs an AC below a predetermined reference level. The signal is determined as noise, and only an AC signal having a reference level or higher is converted into a pulse signal having a pulse width corresponding thereto and output.

At this time, when converting the AC signal into a pulse signal, the signal processor 130 determines that the plurality of AC signals are generated by a single object when the AC signals exist within a predetermined time period, thereby converting the plurality of AC signals to corresponding pulse widths. It can be converted into a single pulse signal having a predetermined time for determining a single object can be determined by the company designing the present invention, it can be implemented using a hardware configuration.

The configuration of the signal processor 130 will be described in detail with reference to FIG. 2.

The controller 140 receives the pulse signal output from the signal processor 130, calculates a pulse width, that is, a pulse width time of the pulse signal, and compares the calculated pulse width with a preset pulse width range to obtain a pulse width. If it is within the pulse width range, it is determined that the micro-object has passed through the light film, and outputs a detection signal indicating that the micro-object has been detected, for example, a pulse signal having a predetermined width. Determine the signal as a bad signal and remove it.

That is, if the pulse width is out of the pulse width range, the controller 140 determines that the micro object has not passed through the light film and prevents the detection signal from being output. It is possible to distinguish the defective particles, which are much different, and through this, it is possible to increase the accuracy in counting micro-objects.

Further, when the time interval between the input pulse signal and the pulse signal is less than or equal to a predetermined determination time, for example, 10 [ms], the control unit 140 determines that the two pulse signals are generated by one micro-object, and thus the two pulses. Recognize the signal as one pulse signal, calculate the pulse width by adding the pulse width of the first pulse signal and the pulse width of the second pulse signal, compare the calculated pulse width with the corresponding pulse width range, and detect according to the result. It is possible to output a signal or to prevent the detection signal from being output.

Of course, in this case, only the time interval between the two pulse signals has been described. However, three pulse signals sequentially input, for example, the first pulse signal, the second pulse signal, and the third pulse signal are sequentially input. If it is assumed that the time interval between two pulse signals is less than or equal to the determination time, and that the time interval between second and third pulse signals is less than or equal to the determination time, the control unit generates the first, second, and third pulse signals by one micro-object. The pulse width is calculated based on the determined pulse signal.

In this case, when the plurality of pulse signals are recognized as one pulse signal, the pulse widths of the pulse signals are calculated by adding the pulse widths. However, as another example, two hours are obtained using the start time of the first pulse signal and the end time of the last pulse signal. The difference may be calculated as the pulse width.

As described above, the controller determines whether the plurality of pulse signals are pulse signals generated by one micro object through time intervals of the sequentially input pulse signals, thereby minimizing errors that may occur in counting the micro objects. Can be.

Here, the determination time between pulse signals for determining as one pulse signal may be determined by the passing time interval of the micro-objects passing through the infrared light film.

Furthermore, in order to minimize an error that may occur according to the size of the micro object, the controller 140 may vary a pulse width range for comparing the pulse width of the pulse signal input to the controller 140 by the size of the micro object. It is also possible to determine whether to output the detection signal by comparing the pulse width range corresponding to the size of the selected micro-object among the pulse width ranges differently set by size with the pulse width of the pulse signal.

At this time, the size of the micro-objects passing through the light film can be set in various ways, for example, SS, S, m, M, sL, L, etc. by the size of the micro-objects from very small to large size in several steps The setting step may be determined by the kind of the micro object, for example, the micro object to be counted, such as millet, rice, beans, large beans, and the like.

The size of the micro-object can be selected through a switching means that can select the size, etc. If the size of the micro-object to be sensed by the switching means is selected, the size information of the selected micro-object is transmitted to the controller 140 In addition, the pulse width range corresponding to the selected size among the preset pulse width ranges may be searched for each micro object size, and compared with the pulse width of the pulse signal input to the controller 140 using the searched pulse width range.

Table 1 shows an example of the pulse width range set for each micro-object size.

Micro Object Size Pulse width [ms] Pulse width [ms] SS 3 15 S 4 16 m 5 18 M 6 20 sL 7 25 L 8 30

As can be seen from Table 1, it can be seen that the pulse width range set for each micro object size is determined by the minimum pulse width and the maximum pulse width, and its value is set differently for each micro object size.

Of course, the pulse width range for each size is not limited to this value, and it is apparent to those skilled in the art that the value may vary depending on the situation such as the number of steps of dividing the size of the micro-object.

As described above, the optical film sensing device according to an embodiment of the present invention converts an AC signal of a change in an electrical signal generated when a micro object passes through the optical film into a pulse signal using a hardware configuration, and converts the converted pulse signal. By minimizing the error of sensing the micro object through the software process, the sensing signal which is the result signal is generated / outputted to increase the sensing accuracy of the micro object. It can also improve reliability.

In addition, by setting the pulse width range differently to determine whether the micro-objects are detected according to the size of the micro-objects to be sensed, it is possible to reduce the sensing error that can occur according to the size of the micro-objects, this is a micro-object counter This can reduce labor losses that depended on manual labor when counting existing micro-objects.

FIG. 2 illustrates a configuration of an embodiment of the signal processor illustrated in FIG. 1.

Referring to FIG. 2, the signal processor 130 includes a detector 210, an amplifier 220, a waveform shaping unit 230, a comparator 240, and a pulse converter 250.

The detection unit 210 amplifies the electrical signal received from the film receiving unit by a predetermined value, for example, about 400 times using the first amplifier 211, and then changes the electrical signal using the differentiator 212. Detects an alternating signal for.

In this case, the electrical signal received by the signal processor may include noise, and may include a filter for filtering the noise, and the detector 210 may amplify the electrical signal output through the filter and then convert the AC signal therefrom. Can be detected.

Here, amplifying the electrical signal by using the first amplifier 211 is for optimally detecting the sensed light conversion signal.

The amplifier 220 removes the offset from the AC signal detected by the detector 210, and amplifies the AC signal from which the offset is removed by a predetermined value, for example, a gain of 200 times amplification and outputs the amplified signal.

The waveform shaping unit 230 performs rectification to remove the negative waveform of the AC signal by using the diode 231, and shapes the waveform by using the first delay circuit 232.

At this time, the passive element value constituting the first delay circuit 232 may be determined by the company developing the device to meet the purpose of the present invention.

The comparison unit 240 compares the AC signal output by the waveform shaping unit 230 with a preset reference level and outputs an AC signal having a reference level or more.

The pulse converter 250 delay-forms the AC signal output from the comparator 240 using the second delay circuit 251, and uses the waveform shaping circuit 252 through the second delay circuit 251. The AC signal is converted into a pulse signal having a corresponding pulse width and output.

In this case, the pulse converter 250 may convert a plurality of AC signals input to the pulse converter 250 into a single pulse signal using the second delay circuit 251 and the waveform shaping circuit 252. This may be the case where a plurality of AC signals are received within a delayable time by the second delay circuit 251.

Of course, the time delayed by the second delay circuit 251 may be adjusted through a passive element value constituting the second delay circuit 251, and this value may also be provided to a company developing the optical film sensing device of the present invention. It can be determined by a variety of data collection, such as experiments and measurements.

The functions of the signal processor and the controller will be described with reference to FIG. 3 as follows.

3 is an exemplary diagram illustrating a waveform passing through the light film and a pulse waveform input to the controller.

Figure 3 (a) shows the waveform when the non-uniform micro-object passed through the light film, three alternating signals are generated for one micro-object like the lower waveform, but, as shown in the upper waveform, It can be seen that the second delay circuit and the waveform shaping circuit are converted into one pulse signal having pulse widths for three AC signals so as to be recognized as a micro object, and are outputted to the controller.

 The control unit calculates the pulse width of the converted pulse signal, and compares the calculated pulse width time (about 17 [ms]) with the pulse width range set to the micro-object size, thereby determining whether or not it is included in the pulse width range. Determine whether to output the detection signal. For example, when the size of the selected micro-object is SS or S with reference to Table 1, the controller determines that the pulse signal is a bad signal and prevents the detection signal from being output, and the size of the micro-object is m, M, sL, In the case of any one of L, the controller may determine the pulse signal as a signal for detecting a micro-object and output a detection signal.

3 (b) shows that two pulse waveforms are generated from one micro-object due to physical error. This means that two pulse signals are generated due to digital physical error. For example, it is determined whether it is within 10 [ms], and as shown, since the time interval of the two pulse signals is within 10 [ms], the controller determines that two pulse signals are generated by one micro-object.

Therefore, the controller calculates the pulse width time for the two pulse signals, and compares the calculated pulse width time with the pulse width range to determine whether to output the detection signal.

In this case, when the pulse widths for the two pulse signals 310 are included in the pulse width range, and the remaining two pulse signals 320 and 330 are also included in the pulse width range, the controller may output three sensing signals.

As can be seen through Figure 3, the optical film sensing device of the present invention has a hardware configuration that constitutes a signal processing unit that may be a problem caused by non-uniformity of the micro-object itself, a problem that may occur due to a digital physical error and the like; It can be seen that the solution can be solved through software configuration of the control unit.

4 is a flowchart illustrating an operation of a light film sensing method for sensing a micro object according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the optical film sensing method generates and transmits a light film for sensing a micro object using a plurality of infrared light emitting devices (S410).

When the optical film is transmitted, the optical film is received using the solar cell element, and an electrical signal for the received optical film, for example, a voltage is output (S420).

At this time, when the micro-objects pass through the optical film, a change in the electrical signal occurs according to the change of the wavelength, which causes the solar cell device to output a micro-voltage for the change of the electrical signal. The difference between the voltage when it does not pass and the voltage when it passes.

The AC signal corresponding to the change of the electrical signal is detected from the electrical signal output from the solar cell device, and the detected AC signal is compared with the preset reference level to determine whether the level of the AC signal is greater than or equal to the reference level (S430, S440). .

At this time, in order to accurately detect the micro voltage generated when the micro-object passes through the optical film before detecting the alternating current, it is preferable to amplify the micro voltage by a predetermined value, and an unnecessary signal such as noise may be included in the electrical signal. Therefore, it is desirable to perform a filtering process to remove unnecessary signals.

As a result of the determination in step S440, if the detected AC signal level is equal to or higher than the reference level, the signal is determined to be a normal signal, and the AC signal is converted into a pulse signal and outputted (S450).

In this case, the output pulse signal may have a pulse width corresponding to an alternating current signal. When a plurality of alternating current signals exist within a predetermined time when converted into a pulse signal, the output pulse signal may be determined as a signal generated by one micro-object. The AC signal of may be converted into one pulse signal having a corresponding pulse width.

The pulse width of the pulse signal is calculated by receiving the converted pulse signal, and it is determined whether the calculated pulse width is included in the preset pulse width range (S460 and S470).

That is, it is determined whether or not the corresponding pulse signal is a signal for sensing a micro object using the pulse width range.

As a result of the determination in step S470, when the calculated pulse width is included in the pulse width range, that is, between the minimum pulse width and the maximum pulse width, it is determined that the micro-object is sensed and thus has a sensing signal for sensing the micro-object, for example, having a predetermined width. A pulse signal is output (S480).

Here, the sensing signal may be input to a counter for counting the micro-objects and used to count the micro-objects passing through the optical film in the counter.

On the other hand, if the calculated pulse width is out of the preset pulse width range as a result of step S470, the received pulse signal is determined as a bad signal to prevent the detection signal from being output (S490).

That is, although a pulse signal is generated, it is recognized that the micro-object is not sensed by determining that the pulse signal is a pulse signal generated by disturbing pulses due to noise or diffused reflection of seeds or defective particles having a large difference in size.

The optical film sensing method according to an exemplary embodiment of the present invention may determine whether a plurality of pulse signals are generated by a single object by the time interval between the received pulse signals, which will be described with reference to FIG. 5. .

FIG. 5 shows a flowchart of an embodiment of step S460 shown in FIG. 4.

Referring to FIG. 5, in calculating the pulse width, the pulse width time of the received pulse signal is counted (S510).

After counting all pulse width times for the pulse signal, it is determined whether a time interval until the next pulse signal is input is within a predetermined determination time (S520).

In this case, the predetermined determination time may vary depending on the situation, which may be set by using the time between the micro-objects passing through the film when the micro-objects sequentially pass through the film.

In operation S520, when another pulse signal is received within the determination time after the pulse width time counting for the pulse signal is finished, the other pulse signal is determined to be one pulse signal, and the other pulse signal is received. The pulse width time of the signal is counted in addition to the pulse width time of the counted previous pulse signal (S530).

That is, by adding the pulse width times of the two pulse signals, the pulse width time for comparing with the pulse width range is calculated. Of course, without adding the pulse width time of the two pulse time, it can be calculated as the pulse width time until the start time when the first pulse signal is received and the time when the second pulse signal ends.

Steps S520 and S530 are repeatedly performed when no other pulse signal is received within the determination time, that is, until the time interval between the pulse signals exceeds the determination time, and if no other pulse signal is received within the determination time in step S520. In operation S540, the counted time is calculated as the pulse width time.

As described above, in the optical film sensing method of the present invention, even when a plurality of pulse signals are generated by one micro-object, only the detection signal for one micro-object is generated and output using the determination time, so that the error in counting the micro-objects is determined. It can be reduced, thereby increasing the reliability of the micro-object count.

In addition, in the optical film sensing method of the present invention, in order to prevent errors that may occur according to the size of the micro-objects, the pulse width range that can be compared with the pulse width of the pulse signal for each micro-object size is set differently, and the comparison and The determination may be performed, which will be described with reference to FIG. 6.

6 is a flowchart illustrating a further operation of the light film sensing method illustrated in FIG. 4.

Referring to FIG. 6, when the pulse width time for the pulse signal is calculated, the film sensing method searches for a pulse width range for comparison with the calculated pulse width, which is generated according to the micro-object size. In order to minimize possible errors, the micro-object size to be sensed is selected through a predetermined means capable of selecting the micro-object size when sensing the light film.

That is, the optical film sensing method of the present invention receives the information on the size of the micro-object, this information may be information selected by the user through a specific means that can select the size of the micro-object, the time point at which the information is received Although the pulse width is calculated in FIG. 6 after being calculated, the present invention is not limited thereto and may be received even when the sensing of the micro-object is started (S610).

When the size information of the micro object to be sensed is received, the pulse width and the retrieved pulse width of the calculated pulse signal are searched by searching for a pulse width range corresponding to the selected micro object size from preset and stored pulse width ranges for each micro object size. By comparing the ranges, it is possible to reduce the micro-object coefficient error that can be generated by the difference in the micro-object size (S620).

According to the present invention, an optical film sensing device for sensing a micro object and a method thereof may be modified and applied in various forms within the scope of the technical idea of the present invention and are not limited to the above embodiments. In addition, the embodiments and drawings are merely for the purpose of describing the contents of the invention in detail, not intended to limit the scope of the technical idea of the invention, the present invention described above is common knowledge in the technical field to which the present invention belongs As those skilled in the art can have various substitutions, modifications, and changes without departing from the spirit of the present invention, it is not limited to the embodiments and the accompanying drawings. And should be judged to include equality.

1 illustrates a configuration of an optical film sensing device for sensing a micro object according to an embodiment of the present invention.

FIG. 2 illustrates a configuration of an embodiment of the signal processor illustrated in FIG. 1.

3 is an exemplary diagram illustrating a waveform passing through the light film and a pulse waveform input to the controller.

4 is a flowchart illustrating an operation of a light film sensing method for sensing a micro object according to an exemplary embodiment of the present invention.

FIG. 5 shows a flowchart of an embodiment of step S460 shown in FIG. 4.

6 is a flowchart illustrating a further operation of the light film sensing method illustrated in FIG. 4.

<Description of Symbols for Main Parts of Drawings>

110: light film transmission unit

120: light receiving unit

130: signal processing unit

140: control unit

210: detector

211: first amplifier

212: powder

220: amplification unit

230: waveform shaping

232: first delay circuit

240: comparison unit

250: pulse conversion unit

251: second delay circuit

252: waveform shaping circuit

Claims (11)

In order to sense the micro-objects, a light film transmitter for generating and transmitting a light film using a screen array composed of a plurality of infrared light emitting elements; A light film receiver which receives a light film transmitted from the light film transmitter and outputs a predetermined voltage thereto, and outputs a small voltage corresponding to a change of an electrical signal according to the change of the light film when the micro object passes through the light film; Detecting an AC signal corresponding to the minute voltage output from the film receiving unit, and a reference level corresponding to the size of a micro object selected from among preset reference levels for each of the detected AC signal and the preset sizes of the micro object. Compares and converts an AC signal corresponding to the reference level or more into a pulse signal having a corresponding pulse width, and outputs the converted AC signal when the AC signal corresponding to the reference level or more is within a preset time. A signal processor for determining that the AC signal of the signal is generated by one micro-object and converting the plurality of AC signals into one pulse signal having a corresponding pulse width; And If it is determined that the time interval between two pulse signals continuously output from the signal processor is within a preset time, the two pulse signals are regarded as one pulse signal, and the pulse width of the one pulse signal and the preset size of the micro-objects are determined. Comparing the pulse width ranges corresponding to the sizes of the preselected micro-objects among the preset pulse width ranges, and if the time interval between the two pulse signals is greater than or equal to the predetermined time, the pulse widths of the pulse signals and the When the pulse width of the pulse signal is within the pulse width range by comparing the pulse width range corresponding to the size of the selected micro-object, and outputs a detection signal indicating the detection of the micro-object, the pulse width of the pulse signal is the pulse width If out of range, the pulse signal is judged as a bad signal and the detection signal is output. Control to prevent becoming Light film sensing device comprising a. delete The method of claim 1, The film receiving unit And a solar cell element, and receiving the optical film transmitted from the optical film transmitter using the solar cell device. The method of claim 1, The signal processor A detector for detecting an alternating current signal in response to a change in an electrical signal output from the optical film receiver; An amplifier for amplifying the AC signal detected by the detector by a predetermined value; A waveform shaping unit for removing a negative waveform from the amplified AC signal and shaping the waveform; A comparison unit comparing the standardized waveform with a reference level corresponding to the size of the preselected micro-object; And When the shaped waveform of the reference level or higher is converted into a pulse signal having a corresponding pulse width and output, and the shaped waveform is within a preset time, the plurality of waveforms are generated by one micro-object. A pulse converter configured to determine and convert the plurality of waveforms into a single pulse signal having a corresponding pulse width Light film sensing device comprising a. delete delete Generating and transmitting a light film for sensing a micro object; Receiving the optical film and outputting an electrical signal thereto; Detecting an AC signal corresponding to a change of the electrical signal generated when the micro-object passes through the optical film; The AC signal is compared with a reference level corresponding to the size of the micro object selected from among preset reference levels for each of the predetermined sizes of the micro object, and the corresponding AC signal corresponding to the case where the AC signal is equal to or greater than the reference level is obtained. Converting into a pulse signal having; When the plurality of AC signals corresponding to the reference level or more are within a predetermined time, it is determined that the plurality of AC signals are generated by one micro-object, and the plurality of AC signals may be one pulse having a corresponding pulse width. Converting to a signal; Calculating a pulse width of the converted pulse signal; Determine a time interval and a preset time between two consecutive pulse signals, and if the time interval is within a preset time, determine the two pulse signals as one pulse signal and calculate the pulse width calculated for the one pulse signal and the Compare the pulse width ranges corresponding to the sizes of the selected micro-objects among the preset pulse width ranges for each of the predetermined sizes of the micro-objects, and if the time interval between the two pulse signals is greater than or equal to the predetermined time, each of the pulse signals Comparing a pulse width range computed with respect to a pulse width range corresponding to the size of the preselected micro-object; And If the pulse width of the pulse signal is included in the pulse width range, and outputs a detection signal indicating the detection of the micro-object, if the pulse width of the pulse signal is out of the pulse width range to determine the pulse signal as a bad signal Preventing the detection signal from being output Light film sensing method comprising a. delete The method of claim 7, wherein The step of outputting the electrical signal Receiving the optical film using a solar cell device and the optical film sensing method for outputting an electrical signal thereto. delete delete

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