KR102311299B1 - Apparatus and method for measuring fine dust in consideration of optical properties of construction - Google Patents

Abstract

Disclosed are a device and a method for measuring fine dust by considering a light property of a composition. The device for measuring fine dust comprises: a light emitting unit; a light receiving unit; a first amplifying stage; a second amplifying stage; and a processor. The light emitting unit emits measured light. The light receiving unit receives received light modulated by the fine dust contained in atmosphere during a step of emitting the measured light. The first amplifying stage outputs a first amplifying stage signal by amplifying the received light. The second amplifying stage extracts a scattering signal generated by the fine dust by filtering the first amplifying stage signal and outputs a second amplifying stage signal by amplifying the scattering signal. The processor determines a light property gain determined by the first amplifying stage signal and a light amount signal of the measured light, and determines a dust concentration included in the atmosphere by using the second amplifying stage signal. The present invention can prevent deviation of a concentration measuring performance of the fine dust.

Description

Apparatus and method for measuring fine dust considering optical properties

The present invention relates to an apparatus and method for measuring fine dust, and more particularly, to an apparatus and method for measuring fine dust in consideration of variations in optical characteristics of components included in the apparatus and method for measuring fine dust.

As a problem caused by fine dust occurs, a fine dust measuring device is being developed.

In the conventional fine dust measuring device, the light emitting unit irradiates light, receives the light irradiated from the light receiving unit, and analyzes the signal scattered by the fine dust contained in the air while the light irradiated by the light emitting unit is received by the light receiving unit. was measured.

However, the light-emitting unit and the light-receiving unit included in the fine dust measuring device do not have the same optical characteristics, and variations occur. Accordingly, there is a problem in that it is difficult to identify whether a signal scattered from the light received by the light receiving unit is caused by a deviation in optical characteristics or by fine dust.

In addition, since optical characteristics of the light emitting unit and the light receiving unit are changed according to the temperature, there is also a problem that the measurement result may be different depending on the temperature change of the fine dust measuring device.

Accordingly, there is a demand for a method for measuring fine dust that is not affected by variations in characteristics of components such as a light emitting unit and a light receiving unit included in the fine dust measuring device and temperature changes.

The present invention calculates the concentration of fine dust with reference to the optical characteristic gain determined according to the optical characteristics of the light emitting part and the light receiving part included in the fine dust measuring device, thereby measuring the performance deviation of the fine dust according to the characteristic deviation of the light emitting part and the light receiving part An apparatus and method for preventing this from occurring are provided.

In addition, the present invention provides an apparatus and method for preventing a variation in performance of measuring the concentration of fine dust due to temperature change by calculating the concentration of fine dust with reference to a temperature gain corresponding to each temperature of the device for measuring fine dust do.

In addition, the present invention compares the failure mode reference information determined in consideration of the reduction of the optical characteristic due to continuous use with information related to the current optical characteristic and drives the failure mode according to the comparison result, so that the fine dust measuring device can be used for continuous use. Provided are an apparatus and method for pre-confirming that a failure occurs before the failure occurs at the end of its lifespan.

An apparatus for measuring fine dust according to an embodiment of the present invention includes: a light emitting unit for irradiating measurement light; a light receiving unit for receiving the received light modulated by fine dust contained in the atmosphere while the measurement light is irradiated; a primary amplifying stage amplifying the received light to output a primary amplifying stage signal; a secondary amplifying stage filtering the primary amplifying stage signal to extract a scattering signal generated by the fine dust, amplifying the scattering signal to output a secondary amplifying stage signal; and a processor for determining the concentration of dust contained in the atmosphere by using the optical characteristic gain determined according to the primary amplification stage signal and the light amount signal of the measurement light and the secondary amplification stage signal.

The optical characteristic gain of the apparatus for measuring fine dust according to an embodiment of the present invention is measured at the time when the apparatus for measuring fine dust is manufactured and optical characteristic reference information determined according to the primary amplification stage signal and the light amount signal of each of the plurality of samples It may be determined according to a difference between the first amplification stage signal and the light amount signal.

The apparatus for measuring fine dust according to an embodiment of the present invention further includes a temperature sensor for measuring a current temperature of the apparatus for measuring fine dust, and the processor is configured to include: the optical characteristic gain, characteristic change information according to temperature, current temperature and The temperature gain may be determined using the first amplification stage signal and the light quantity signal, and the concentration of dust included in the atmosphere may be determined using the temperature gain and the secondary amplification stage signal.

The processor of the apparatus for measuring fine dust according to an embodiment of the present invention determines the optical characteristic gain as the temperature gain when the current temperature is room temperature, and when the current temperature is not room temperature, the temperature characteristic The temperature gain may be determined by correcting the optical characteristic gain according to the change information.

The processor of the apparatus for measuring fine dust according to an embodiment of the present invention is configured to, when the first amplification stage signal or the light amount signal of the measurement light is less than the failure mode reference information determined in consideration of the decrease in optical characteristics due to continuous use, fine dust It is determined that a failure has occurred in the measuring device, and the failure mode can be activated.

The method for determining the optical characteristics of a fine dust measuring device according to an embodiment of the present invention is to obtain a primary amplification stage signal amplifying the light received by the light receiving unit from each of the fine dust measuring device samples and a light quantity signal of the measuring light irradiated by the light emitting unit step; determining optical characteristic reference information based on the obtained primary amplification stage signals and light quantity signals; and determining an optical characteristic gain of the manufactured fine dust measuring device according to a difference between the primary amplification stage signal and light quantity signal measured by the manufactured fine dust measuring device and the optical characteristic reference information.

The method for determining optical characteristics of a fine dust measuring device according to an embodiment of the present invention further includes determining characteristic change information according to temperature, wherein the manufactured fine dust measuring device includes the current temperature and the first amplification stage A temperature gain may be determined using a signal and the light quantity signal, and a concentration of dust included in the atmosphere may be determined using the temperature gain, the optical characteristic gain, and the secondary amplification stage signal.

A method for measuring fine dust according to an embodiment of the present invention includes irradiating measuring light; receiving a reception light modulated by fine dust contained in the atmosphere while the measurement light is irradiated; amplifying the received light to output a first amplification stage signal; filtering the first amplification stage signal to extract a scattering signal generated by the fine dust, and amplifying the scattering signal to output a secondary amplifying stage signal; and determining the concentration of dust contained in the atmosphere by using the optical characteristic gain determined according to the primary amplification stage signal and the light amount signal of the measurement light and the secondary amplification stage signal.

The optical characteristic gain of the method for measuring fine dust according to an embodiment of the present invention is measured at the time when the fine dust measurement device is manufactured and optical characteristic reference information determined according to the primary amplification stage signal and the light amount signal of each of the plurality of samples It may be determined according to a difference between the first amplification stage signal and the light amount signal.

In the method for measuring fine dust according to an embodiment of the present invention, when the first amplification stage signal or the light amount signal of the measurement light is less than the failure mode reference information determined in consideration of the decrease in optical characteristics due to continuous use, the fine dust measuring device is The method may further include determining that a failure has occurred and driving a failure mode.

A method for measuring fine dust according to an embodiment of the present invention includes irradiating measuring light; receiving a reception light modulated by fine dust contained in the atmosphere while the measurement light is irradiated; irradiating the measurement light and measuring the current temperature of the fine dust measuring device that receives the received light; amplifying the received light to output a first amplification stage signal; filtering the first amplification stage signal to extract a scattering signal generated by the fine dust, and amplifying the scattering signal to output a secondary amplifying stage signal; determining a temperature gain by using the optical characteristic gain determined according to the primary amplification stage signal and the light quantity signal of the measured light, characteristic change information according to temperature, the current temperature, and the primary amplification stage signal and the light quantity signal; and determining the concentration of dust contained in the atmosphere by using the temperature gain and the secondary amplification stage signal.

The determining of the temperature gain of the method for measuring fine dust according to an embodiment of the present invention includes determining the optical characteristic gain as the temperature gain when the current temperature is room temperature, and when the current temperature is not room temperature, the The temperature gain may be determined by correcting the optical characteristic gain according to the characteristic change information according to the temperature.

According to an embodiment of the present invention, by calculating the concentration of fine dust with reference to the optical characteristic gain determined according to the optical characteristics of the light emitting unit and the light receiving unit included in the fine dust measuring device, the fine dust according to the characteristic deviation of the light emitting unit and the light receiving unit is calculated. It is possible to prevent the occurrence of variations in the performance of measuring the concentration of dust.

In addition, according to an embodiment of the present invention, by calculating the concentration of the fine dust with reference to the temperature gain corresponding to each temperature of the fine dust measuring device, it is possible to prevent a deviation in the performance of measuring the concentration of the fine dust according to the temperature change. can do.

And, according to an embodiment of the present invention, by comparing the failure mode reference information determined in consideration of the reduction of the optical characteristic due to continuous use with information related to the current optical characteristic and driving the failure mode according to the comparison result, fine dust It can be confirmed in advance that the failure occurs before the failure occurs due to the end of life of the measuring device due to continuous use.

1 is a view showing an apparatus for measuring fine dust according to an embodiment of the present invention.
2 is an example of a primary amplification stage signal and a secondary amplification stage signal according to an embodiment of the present invention.
3 is an example of a process of setting optical characteristic reference information according to an embodiment of the present invention.
4 is an example of a process of determining an optical characteristic gain according to an embodiment of the present invention.
5 is an example of characteristic change information according to temperature according to an embodiment of the present invention.
6 is an example of a process of determining a low temperature temperature gain according to an embodiment of the present invention.
7 is an example of a process of determining a temperature gain for each temperature according to an embodiment of the present invention.
8 is an example of the change of the light amount signal and the primary amplification stage signal with the lapse of time.
9 is an example of a process of determining whether a failure mode is present according to an embodiment of the present invention.
10 is a flowchart illustrating an optical characteristic determination method for a fine dust measuring apparatus according to an embodiment of the present invention.
11 is a flowchart illustrating a method for measuring fine dust according to an embodiment of the present invention.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes may be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It should be understood that all modifications, equivalents and substitutes for the embodiments are included in the scope of the rights.

The terms used in the examples are used for description purposes only, and should not be construed as limiting. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In addition, in the description with reference to the accompanying drawings, the same components are given the same reference numerals regardless of the reference numerals, and the overlapping description thereof will be omitted. In the description of the embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description thereof will be omitted.

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

1 is a view showing an apparatus for measuring fine dust according to an embodiment of the present invention.

The apparatus for measuring fine dust includes a light emitting unit 110 , a light receiving unit 120 , a primary amplification stage 130 , a secondary amplification stage 140 , a processor 150 , and a temperature sensor 160 as shown in FIG. 1 . can do. For example, the fine dust measuring device may be a fine dust sensor or a fine dust measuring device.

The light emitting unit 110 may radiate measurement light toward the light receiving unit 120 . In this case, the light emitting unit 110 may transmit a light amount signal indicating the light amount of the irradiated measurement light to the processor 150 . For example, the light emitting unit 110 may be a laser module.

The light receiving unit 120 may receive the received light in which the measurement light is modulated. In this case, the received light may be light modulated by fine dust contained in the atmosphere between the light emitting unit 110 and the light receiving unit 120 while the measurement light is irradiated toward the light receiving unit 120 . For example, the light receiving unit 120 may be a photodiode.

The primary amplifying stage 130 may amplify the received light received by the light receiving unit 120 to output a primary amplifying stage signal. In this case, the primary amplification stage 130 may transmit the primary amplification stage signal to the secondary amplification stage 140 and the processor 150 .

The secondary amplification stage 140 may filter the primary amplification stage signal to extract a scattering signal generated by fine dust. Specifically, the secondary amplifier 140 may extract the AC component from the received light by filtering the DC component due to the dark current and crosstalk of the fine dust measuring device. In this case, the AC component may be a scattering signal generated by fine dust.

In addition, the secondary amplification stage 140 may amplify the extracted scattering signal to output the secondary amplification stage signal.

The processor 150 may determine the concentration of dust contained in the atmosphere by using a preset and stored optical characteristic gain and the secondary amplification stage signal received from the secondary amplification stage 140 .

In this case, the optical characteristic gain may be determined according to a difference between the optical characteristic reference information and the primary amplification stage signal and the light quantity signal measured at the time when the fine dust measuring apparatus is manufactured. Also, the optical characteristic reference information may be determined according to the primary amplification stage signal and the light amount signal of each of the plurality of samples. A process in which the optical characteristic reference information is determined will be described in detail below with reference to FIG. 3 . In addition, the process of determining the optical characteristic gain will be described in detail below with reference to FIG. 4 . For example, the optical characteristic gain may be determined by an apparatus for manufacturing a fine dust measuring element or an optical characteristic determining apparatus and stored in a storage medium of the fine dust measuring apparatus. In this case, the storage medium may be connected to the processor 150 . For example, the storage medium may be an electrically erasable programmable read-only memory (EEPROM).

In addition, the processor 150 determines that when the primary amplification stage signal received from the primary amplification stage 130 or the light amount signal of the measurement light received from the light emitting unit 110 is less than the failure mode reference information, a failure occurs in the fine dust measuring device It may be determined that the failure mode is driven. In this case, the failure mode reference information may include at least one of the lowest value of the primary amplification stage signal and the lowest value of the light quantity signal determined in consideration of the reduction in optical characteristics due to continuous use.

The temperature sensor 160 may measure the current temperature of the fine dust measuring device. In this case, the processor 150 may determine the temperature gain by using the optical characteristic gain, the characteristic change information according to the temperature, the current temperature, the primary amplification stage signal, and the light quantity signal. In this case, the characteristic change information according to the temperature may indicate a change in the light amount signal and the primary amplification stage signal according to an increase or decrease in temperature.

And, the optical characteristic gain may be a temperature gain when the current temperature is room temperature. Accordingly, when the current temperature is included in the section set as room temperature, the processor 150 may determine the concentration of dust included in the atmosphere by using the optical characteristic gain and the secondary amplification stage signal.

In addition, when the current temperature is not included in the section set as room temperature, the processor 150 may determine the temperature gain by correcting the optical characteristic gain according to the characteristic change information according to the temperature. In addition, the processor 150 may determine the concentration of dust contained in the atmosphere by using the determined optical characteristic gain and the secondary amplification stage signal.

The fine dust measuring device calculates the concentration of fine dust with reference to the optical characteristic gain determined according to the optical characteristics of the light emitting unit 110 and the light receiving unit 120 included in the fine dust measuring device, and thus the light emitting unit 110 and the light receiving unit ( 120), it is possible to prevent a deviation in the performance of measuring the concentration of fine dust due to the characteristic deviation.

In addition, the fine dust measuring apparatus calculates the concentration of fine dust with reference to a temperature gain corresponding to each temperature of the fine dust measuring apparatus, thereby preventing a variation in performance of measuring the fine dust concentration according to a temperature change.

In addition, the fine dust measuring device compares the failure mode reference information determined in consideration of the reduction in optical properties due to continuous use with information related to the current optical properties and drives the failure mode according to the comparison result, so that the fine dust measuring device continues It can be confirmed in advance that a failure occurs before the failure occurs due to the end of its lifespan.

2 is an example of a primary amplification stage signal and a secondary amplification stage signal according to an embodiment of the present invention.

The primary amplification stage signal 210 output from the primary amplification stage 130 is a section ( 211 ), and a section 212 of received light received by the light receiving unit 120 during the time the measurement light is irradiated from the light emitting unit 110 . In this case, the section 212 may include a DC component due to dark current and crosstalk of the fine dust measuring device and an AC component that is a scattering signal generated by the fine dust.

As shown in FIG. 2, the secondary amplification stage signal 220 output from the secondary amplification stage 140 has the DC component removed from the primary amplification stage signal 210, and the AC component 221, which is a scattering signal generated by fine dust. This may be an amplified signal.

In this case, the scattering signal generated by the fine dust may be generated by being modulated by the fine dust contained in the atmosphere between the light emitting unit 110 and the light receiving unit 120 while the measurement light is irradiated toward the light receiving unit 120 . Accordingly, the AC component 221 may appear in the same time interval as the interval 212 .

3 is an example of a process of setting optical characteristic reference information according to an embodiment of the present invention.

An apparatus for manufacturing a fine dust measuring device or an optical characteristic determining apparatus may determine optical characteristic reference information using samples of the fine dust measuring device and determine an optical characteristic gain of each of the fine dust measuring apparatuses. For example, the optical characteristic determining device may be a terminal such as a computer for controlling the fine dust measuring device manufacturing device, or a processor.

First, the apparatus for determining optical properties may obtain a light amount signal 311 of the measurement light emitted by the light emitting unit of Sample 1 of the fine dust measuring apparatus and a primary amplifier signal 321 amplifying the light received by the light receiving unit. In addition, the apparatus for determining optical properties may obtain a light amount signal 312 of the measurement light emitted by the light emitting unit of the fine dust measuring apparatus Sample 2 and a primary amplifier signal 322 amplifying the light received by the light receiving unit. In addition, the apparatus for determining optical properties may obtain a light amount signal 313 of the measurement light emitted by the light emitting unit of the sample 3 of the fine dust measuring apparatus and a primary amplifier signal 323 amplifying the light received by the light receiving unit. In addition, the apparatus for determining optical properties may obtain a light amount signal 314 of the measurement light emitted by the light emitting unit of the fine dust measuring apparatus sample 4 and a primary amplifier signal 324 amplifying the light received by the light receiving unit.

Next, the optical characteristic determining apparatus may determine the average 315 of the light amount signal 311 , the light amount signal 312 , the light amount signal 313 , and the light amount signal 314 . Also, the optical characteristic determining apparatus may determine the average 325 of the primary amplification stage signal 321 , the primary amplification stage signal 322 , the primary amplification stage signal 323 , and the primary amplification stage signal 324 .

Next, the optical characteristic determination apparatus may determine the optical characteristic reference information 330 and the sensitivity default gain according to the average 315 of the light quantity signal and the average 325 of the primary amplification stage signal. In this case, the sensitivity default gain may be an initial value of the optical characteristic gain.

For example, when the average 315 of the light quantity signal and the average 325 of the primary amplification stage signal are 100, the optical characteristic determination apparatus may determine the optical characteristic reference information and the sensitivity default gain as shown in Table 1. have.

4 is an example of a process of determining an optical characteristic gain according to an embodiment of the present invention.

An optical characteristic determination device can be manufactured to drive a fine dust measuring device that requires determination of an optical characteristic gain. In addition, the optical characteristic determination device may obtain a primary amplification stage signal obtained by amplifying the light amount signal of the measurement light emitted by the light emitting unit of the manufactured fine dust measuring device and the light received by the light receiving unit.

In this case, the optical characteristic determination apparatus may determine the optical characteristic gain of the fine dust measuring apparatus according to a difference between the obtained primary amplification stage signal and the light quantity signal and the optical characteristic reference information.

For example, when the fine dust measuring device manufacturing apparatus manufactures the fine dust measuring device sample 1, the optical characteristic determining device determines the amount of light signal 411 of the measurement light emitted by the light emitting unit of the fine dust measuring device sample 1 and the light receiving unit received. A first amplification stage signal 412 amplifying light may be obtained. In this case, the light intensity signal 411 and the primary amplification stage signal 412 may have values greater than the average 315 of the light quantity signal and the average 325 of the primary amplification stage signal, respectively.

Accordingly, the optical characteristic 413 determined by adding the light amount signal 411 and the first amplification stage signal 412 may also be greater than the optical characteristic reference information 330 . In this case, as shown in Table 2, the optical characteristic determining apparatus may determine the sensitivity gain for reducing the sensitivity as the optical characteristic gain of the fine dust measuring apparatus Sample 1 . At this time, the processor of Sample 1 of the fine dust measuring device applies an optical characteristic gain of 0.67 to the input secondary amplification stage signal to reduce it, so that the intensity of the secondary amplification stage signal is within the standard range used for calculating the fine dust concentration. can

In addition, when the fine dust measuring device manufacturing apparatus manufactures the fine dust measuring device sample 2, the optical characteristic determining device receives the light amount signal 421 of the measurement light emitted by the light emitting unit of the fine dust measuring device sample 2 and the light received by the light receiving unit. The amplified primary amplification stage signal 422 may be obtained. In this case, the light intensity signal 421 and the primary amplification stage signal 422 may have values smaller than the average 315 of the light quantity signal and the average 325 of the primary amplification stage signal, respectively.

Accordingly, the optical characteristic 423 determined by adding the light amount signal 421 and the first amplification stage signal 422 may also be smaller than the optical characteristic reference information 330 . In this case, as shown in Table 3, the optical characteristic determining apparatus may determine a sensitivity gain to increase the sensitivity as the optical characteristic gain of the fine dust measuring apparatus sample 2 . At this time, the processor of the fine dust measuring device sample 2 applies and increases the optical characteristic gain of 1.33 to the input secondary amplification stage signal, so that the intensity of the secondary amplification stage signal is within the standard range used for calculating the fine dust concentration. can

5 is an example of characteristic change information according to temperature according to an embodiment of the present invention.

As shown in FIG. 5 , the intensity 510 of the light amount signal indicating the same amount of light may be changed according to temperature.

In addition, as shown in FIG. 5 , in the primary amplification stage signal, the intensity 520 of the primary amplification stage signal amplifying the same received light may be changed according to temperature.

In addition, the characteristic change information according to the temperature may include the intensity 510 of the light intensity signal and the intensity 520 of the primary amplification stage signal that change according to the temperature.

6 is an example of a process of determining a temperature gain according to an embodiment of the present invention.

The processor 150 of the apparatus for measuring fine dust may determine the temperature gain by using the characteristic change information according to the temperature, the current temperature, the primary amplification stage signal, and the light quantity signal.

For example, when the fine dust measuring device is the dust measuring device sample 1 , the processor 150 may measure the temperature of the dust measuring device sample 1 using the temperature sensor 160 . In addition, the processor 150 obtains the first amplification stage signal 412 amplifying the light received by the light intensity signal 411 of the light emitting unit 110 of the fine dust measuring device sample 1 and the light received by the light receiving unit 120 . can do.

Since the optical characteristic gain is a temperature gain when the current temperature is room temperature, when the current temperature of the dust measuring apparatus sample 1 is a temperature section classified as low temperature, the temperature gain may be determined as shown in FIG. 3 .

And, as shown in FIG. 5 , the intensity of the light intensity signal at a low temperature may increase than the intensity of the light intensity signal at room temperature. Accordingly, when the current temperature of the dust measuring device sample 1 is a temperature section classified as low temperature, the difference between the light amount signal 611 and the average 315 of the light amount signal as shown in FIG. 6 is the light amount signal shown in FIG. It may be greater than the difference between the 611 and the average 315 of the light amount signal.

In addition, as shown in FIG. 5 , the intensity of the signal at the primary amplification stage at low temperature may be reduced compared to the intensity of the signal at the primary amplification stage at room temperature. Therefore, when the current temperature of the dust measuring device sample 1 is a temperature section classified as low, the primary amplification stage signal 612 may be smaller than the average 325 of the primary amplification stage signal unlike FIG. 3 .

In this case, as shown in Table 4, the processor 150 may determine the value of the optical characteristic at low temperature, 240, by adding 160, which is the intensity of the light quantity signal 611, and 80, which is the intensity of the primary amplification stage signal 612. In addition, the processor 150 may determine a temperature correction gain, which is a temperature gain at a low temperature, by correcting the optical characteristic gain at room temperature determined as shown in Table 1 according to the characteristic change information according to temperature. At this time, the processor of Sample 1 of the fine dust measuring device applies a temperature gain of 0.83 to the input secondary amplification stage signal and decreases it, so that the strength of the secondary amplification stage signal is within the standard range used for calculating the fine dust concentration. have.

In addition, when the fine dust measuring device manufacturing apparatus manufactures the fine dust measuring device sample 2, the optical characteristic determining device receives the light amount signal 621 of the measurement light emitted by the light emitting unit of the fine dust measuring device sample 2 and the light received by the light receiving unit. The amplified primary amplification stage signal 622 may be obtained.

In this case, as shown in Table 5, the processor 150 may determine 210, which is the value of the optical characteristic at low temperature, by adding 120, which is the intensity of the light quantity signal 621, and 90, which is the intensity of the primary amplification stage signal 622. In addition, the processor 150 may determine a temperature correction gain, which is a temperature gain at a low temperature, by correcting the optical characteristic gain at room temperature determined as shown in Table 2 according to the characteristic change information according to temperature. At this time, the processor of Sample 2 of the fine dust measuring device applies a temperature gain of 0.93 to the input secondary amplification stage signal and reduces it, so that the strength of the secondary amplification stage signal is within the standard range used for calculating the fine dust concentration. have.

7 is an example of a process of determining a temperature gain for each temperature according to an embodiment of the present invention.

As shown in FIG. 8, according to an error in the process of manufacturing the fine dust measuring device, the fine dust measuring device sample 1 (710) and the fine dust measuring device sample 1 (710) and the fine dust measuring device sample 2 (720) have a large difference in optical characteristics for each temperature compared to the second (720) There may be a fine dust measuring device sample 2 720 having a smaller difference in optical characteristics for each temperature compared to the dust measuring device sample 1 710 .

Accordingly, the processor 150 of the device for measuring fine dust determines the temperature gain using the characteristic change information according to the temperature, the current temperature, the primary amplification stage signal and the light amount signal, and determines the dust concentration by applying the temperature gain, The dust concentration measured by each of the fine dust measuring device sample 1 710 and the fine dust measuring device sample 2 720 having different optical characteristics may be the same.

Specifically, in order to determine the temperature gain for each temperature of the dust measuring device sample 1 710, the temperature of the dust measuring device sample 1 710 may be changed to a temperature ①, a temperature ②, a temperature ③, a temperature ④, a temperature ⑤. At this time, the temperature ① is the highest temperature, and the temperature may be decreased in the order of the temperature ②, the temperature ③, the temperature ④, and the temperature ⑤. In addition, the temperature ③ may be a temperature set to room temperature. For example, the room temperature may be in the range of 20±5° C. as the average temperature throughout the year. In addition, if the conditions that the temperature ① and the temperature ② are higher than the temperature ③ and the temperature ④ and the temperature ⑤ are lower than the temperature ③ are satisfied, the respective temperature ranges may be set differently according to the exemplary embodiment.

Next, for each temperature of the dust measuring device sample 1 710 measured using the temperature sensor 160 , the processor 150 determines the amount of light of the measurement light irradiated by the light emitting unit 110 of the fine dust measuring device sample 1 710 . The signal and light receiving unit 120 may obtain a primary amplification stage signal amplifying the received light. For example, the processor 150 may obtain the light amount signal and the primary amplification stage signal as shown in Table 6 for each temperature.

In addition, the processor 150 may determine a temperature correction gain for each temperature of the fine dust measuring device sample 1 710 according to a difference between the optical characteristic at room temperature and the optical characteristic for each temperature.

Specifically, since the temperature ③ is room temperature, the processor 150 determines the optical characteristic 200 at room temperature based on the light intensity signal 100 and the primary amplification stage signal 100 obtained when the fine dust measuring device sample 1 710 is the temperature ③ can decide

Next, the processor 150 may determine the optical characteristic 180 at the temperature ① based on the light amount signal 60 and the first amplification stage signal 120 obtained when the fine dust measuring device sample 1 710 is the temperature ①. At this time, the processor 150 may determine the temperature correction gain 1.11 at the temperature ① according to the difference between the optical characteristic 180 at the temperature ① and the optical characteristic 200 at the room temperature. Specifically, since the optical characteristic 180 at the temperature ① is lower than the optical characteristic 200 at room temperature, the processor 150 determines the temperature correction gain at the temperature ① so that the optical characteristic is increased, so that the light at the temperature ① lower than the room temperature. The characteristic can be used with the same value as the optical characteristic at room temperature in the process of determining the dust concentration.

Also, the processor 150 may determine the optical characteristic 190 at the temperature ② based on the light amount signal 80 and the first amplification stage signal 110 obtained when the fine dust measuring device sample 1 710 is the temperature ②. In this case, the processor 150 may determine the temperature correction gain 1.05 at the temperature ② according to the difference between the optical characteristic 190 at the temperature ② and the optical characteristic 200 at the room temperature. At this time, since optical characteristic 190 at temperature ② has a smaller difference from optical characteristic 200 at room temperature than optical characteristic 180 at temperature ①, temperature compensation gain 1.05 at temperature ② should be lower than temperature compensation gain 1.11 at temperature ① can

And, since the temperature ③ is room temperature, the optical characteristic 200 at the temperature ③ and the optical characteristic 200 at the room temperature are the same, so no correction may be required. Accordingly, the processor 150 may determine the temperature correction gain at the temperature ③ as 1.

Also, the processor 150 may determine the optical characteristic 220 at the temperature ④ based on the light amount signal 130 and the first amplification stage signal 90 obtained when the fine dust measuring device sample 1 710 is the temperature ④. In this case, the processor 150 may determine the temperature correction gain 0.91 at the temperature ④ according to the difference between the optical characteristic 220 at the temperature ④ and the optical characteristic 200 at the room temperature.

In addition, the processor 150 may determine the optical characteristic 240 at the temperature ⑤ based on the light amount signal 160 and the first amplification stage signal 80 obtained when the fine dust measuring device sample 1 710 is the temperature ⑤. In this case, the processor 150 may determine the temperature correction gain 0.83 at the temperature ⑤ according to the difference between the optical characteristic 240 at the temperature ⑤ and the optical characteristic 200 at the room temperature.

In addition, in order to determine the temperature gain for each temperature of the dust measuring device sample 2 720 , the temperature of the dust measuring device sample 2 720 may be changed to a temperature ①, a temperature ②, a temperature ③, a temperature ④, a temperature ⑤.

Next, for each temperature of the dust measuring device sample 2 720 measured using the temperature sensor 160 , the processor 150 measures the amount of light emitted by the light emitting unit 110 of the fine dust measuring device sample 2 720 . The signal and light receiving unit 120 may obtain a primary amplification stage signal amplifying the received light. For example, the processor 150 may acquire the light amount signal and the primary amplification stage signal as shown in Table 7 for each temperature.

In addition, the processor 150 may determine the temperature correction gain for each temperature of the fine dust measuring device sample 2 720 according to a difference between the optical characteristic at room temperature and the optical characteristic for each temperature.

Specifically, since the temperature ③ is room temperature, the processor 150 determines the optical characteristic 200 at room temperature based on the light intensity signal 100 and the primary amplification stage signal 100 obtained when the fine dust measuring device sample 2 720 is the temperature ③ can decide

Next, the processor 150 may determine the optical characteristic 185 at the temperature ① based on the light amount signal 70 and the first amplification stage signal 115 obtained when the fine dust measuring device sample 2 720 is the temperature ①. In this case, the processor 150 may determine the temperature correction gain 1.08 at the temperature ① according to the difference between the optical characteristic 185 at the temperature ① and the optical characteristic 200 at the room temperature.

Also, the processor 150 may determine the optical characteristic 200 at the temperature ② based on the light amount signal 90 and the first amplification stage signal 110 obtained when the fine dust measuring device sample 2 720 is the temperature ②. In this case, since the optical characteristic 200 at the temperature ② and the optical characteristic 200 at room temperature are the same, the processor 150 may determine the temperature correction gain at the temperature ② as 1. Also, since the optical characteristic 200 at the temperature 3 and the optical characteristic 200 at room temperature are the same, the processor 150 may determine the temperature correction gain at the temperature 3 to be 1.

In addition, the processor 150 may determine the optical characteristic 205 at the temperature ④ based on the light amount signal 110 and the primary amplification stage signal 95 obtained when the fine dust measuring device sample 2 720 is the temperature ④. In this case, the processor 150 may determine the temperature correction gain 0.98 at the temperature ④ according to the difference between the optical characteristic 225 at the temperature ④ and the optical characteristic 200 at the room temperature.

In addition, the processor 150 may determine the optical characteristic 210 at the temperature ⑤ based on the light amount signal 120 and the primary amplification stage signal 90 obtained when the fine dust measuring device sample 2 720 is the temperature ⑤. In this case, the processor 150 may determine the temperature correction gain 0.95 at the temperature ⑤ according to the difference between the optical characteristic 210 at the temperature ⑤ and the optical characteristic 200 at the room temperature.

8 is an example of the change of the light amount signal and the primary amplification stage signal with the lapse of time.

When the fine dust measuring device is continuously used, the light emitting unit 110 and the light receiving unit 120 are consumed, and optical characteristics may decrease. For example, the optical characteristic 810 at the time when the fine dust measuring apparatus is manufactured may decrease like the optical characteristic 820 according to the usage time of the fine dust measuring apparatus.

9 is an example of a process of determining whether a failure mode is present according to an embodiment of the present invention.

The fine dust measuring device manufacturing apparatus or the optical characteristic determining device may determine the failure mode reference information in which the optical characteristics are reduced to such an extent that the fine dust measuring device cannot measure the fine dust, and may store it in a storage medium of the fine dust measuring device. At this time, the failure mode reference information includes the failure mode reference value 933 of the primary amplification stage signal, which is the lowest value of the primary amplification stage signal required for the fine dust measuring device to measure fine dust, and the fine dust measuring device to measure fine dust. It may include at least one of and a failure mode reference value 913 of the light amount signal, which is the lowest value of the required light amount signal.

In addition, the fine dust measuring device manufacturing device or the optical characteristic determining device measures the light intensity signal intensity 911 and the primary amplification stage signal intensity 921 at the time of manufacture for each fine dust measuring device, and the storage medium of the fine dust measuring device can be stored in

The processor 150 of the apparatus for measuring fine dust may monitor whether the light amount signal 912 of the measurement light received from the light emitting unit 110 decreases to less than the failure mode reference value 913 of the light amount signal. In addition, when the light amount signal 912 decreases to less than the failure mode reference value 913 of the light amount signal, the processor 150 may determine that a failure has occurred in the fine dust measuring device and drive the failure mode.

In addition, the processor 150 of the apparatus for measuring fine dust may monitor whether the primary amplification stage signal 932 decreases below the failure mode reference value 933 of the primary amplification stage signal. In addition, when the primary amplification stage signal 932 decreases below the failure mode reference value 933 of the primary amplification stage signal, the processor 150 determines that a failure has occurred in the fine dust measuring device and may drive the failure mode. .

10 is a flowchart illustrating a method for determining optical properties for a fine dust measuring apparatus according to an embodiment of the present invention.

In operation 1010 , the apparatus for determining optical properties may obtain a primary amplification stage signal obtained by amplifying the light received by the light receiving unit from each of the fine dust measuring apparatus samples, and a light amount signal of the measurement light emitted by the light emitting unit. In addition, the optical characteristic determination apparatus may determine optical characteristic reference information based on the obtained primary amplification stage signals and light quantity signals.

In operation 1020 , the optical characteristic determination apparatus may determine characteristic change information according to temperature and store it in a storage medium of the fine dust measurement apparatus. In this case, the characteristic change information according to the temperature may include the intensity 510 of the light intensity signal and the intensity 520 of the primary amplification stage signal that change according to the temperature. According to an embodiment, when the apparatus for measuring fine dust does not include a temperature sensor, step 1020 may be omitted.

In step 1030, the optical characteristic determination apparatus may determine the optical characteristic gain of the manufactured fine dust measurement device according to the difference between the primary amplification stage signal and light amount signal measured by the manufactured fine dust measurement device and the optical characteristic reference information. .

11 is a flowchart illustrating a method for measuring fine dust according to an embodiment of the present invention.

In step 1110, the temperature sensor 160 may measure the current temperature of the fine dust measuring device.

In step 1120 , the light emitting unit 110 may irradiate the measurement light toward the light receiving unit 120 . In this case, the light emitting unit 110 may transmit a light amount signal indicating the light amount of the irradiated measurement light to the processor 150 . In addition, the light receiving unit 120 may receive the received light modulated by the fine dust contained in the atmosphere while the measurement light is irradiated. In this case, the primary amplification stage 130 may amplify the received light to output the primary amplification stage signal.

In operation 1130, the processor 150 may determine whether the light intensity signal and the primary amplification stage signal received in operation 1120 are less than the failure reference information.

When the light intensity signal and the primary amplification stage signal are less than the failure reference information, the processor 150 may determine that the fine dust measuring device has failed and may drive a failure mode in step 1140 . When the light intensity signal and the primary amplification stage signal are equal to or greater than the failure reference information, the processor 150 may perform step 1150 .

In operation 1160 , the processor 150 may determine the temperature gain using the optical characteristic gain pre-stored in the storage medium, the characteristic change information according to the temperature, the current temperature, the primary amplification stage signal, and the light quantity signal. In this case, when the current temperature is room temperature, the processor 150 may determine the optical characteristic gain as the temperature gain.

When the current temperature is not room temperature, the processor 150 may determine the temperature gain by correcting the optical characteristic gain according to the characteristic change information according to the temperature.

In operation 1170, the processor 150 may determine the concentration of dust contained in the atmosphere using the temperature gain and the secondary amplification stage signal. In addition, according to an embodiment, in the fine dust measuring apparatus that does not include the temperature sensor 160 , steps 1110 and 1150 may be omitted. In this case, in step 1170 , the processor 150 may determine the concentration of dust contained in the atmosphere using the optical characteristic gain and the secondary amplification stage signal.

The present invention calculates the concentration of fine dust with reference to the optical characteristic gain determined according to the optical characteristics of the light emitting part and the light receiving part included in the fine dust measuring device, thereby measuring the performance deviation of the fine dust according to the characteristic deviation of the light emitting part and the light receiving part can be prevented from occurring.

In addition, according to the present invention, by calculating the concentration of the fine dust with reference to the temperature gain corresponding to each temperature of the fine dust measuring device, it is possible to prevent a deviation in the performance of measuring the concentration of the fine dust according to the temperature change.

In addition, the present invention compares the failure mode reference information determined in consideration of the reduction of the optical characteristic due to continuous use with information related to the current optical characteristic and drives the failure mode according to the comparison result, so that the fine dust measuring device can be used for continuous use. It is possible to check in advance that a failure occurs before the failure occurs at the end of its lifespan.

Meanwhile, the apparatus for measuring fine dust or the method for measuring fine dust according to the present invention is written as a program that can be executed on a computer and can be implemented in various recording media such as magnetic storage media, optical reading media, and digital storage media.

Implementations of the various techniques described herein may be implemented in digital electronic circuitry, or in computer hardware, firmware, software, or combinations thereof. Implementations may be implemented for processing by, or controlling the operation of, a data processing device, eg, a programmable processor, computer, or number of computers, in a computer program product, eg, a machine readable storage device (computer readable available medium) as a computer program tangibly embodied in it. A computer program, such as the computer program(s) described above, may be written in any form of programming language, including compiled or interpreted languages, and may be written as a standalone program or in a module, component, subroutine, or computing environment. It can be deployed in any form, including as other units suitable for use in A computer program may be deployed to be processed on one computer or multiple computers at one site or to be distributed across multiple sites and interconnected by a communications network.

Processors suitable for processing a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital computer. In general, a processor will receive instructions and data from read only memory or random access memory or both. Elements of a computer may include at least one processor that executes instructions and one or more memory devices that store instructions and data. In general, a computer may include one or more mass storage devices for storing data, for example magnetic, magneto-optical disks, or optical disks, receiving data from, sending data to, or both. may be combined to become Information carriers suitable for embodying computer program instructions and data are, for example, semiconductor memory devices, for example, magnetic media such as hard disks, floppy disks and magnetic tapes, Compact Disk Read Only Memory (CD-ROM). ), optical recording media such as DVD (Digital Video Disk), magneto-optical media such as optical disk, ROM (Read Only Memory), RAM (RAM) , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), and the like. Processors and memories may be supplemented by, or included in, special purpose logic circuitry.

Also, the computer-readable medium may be any available medium that can be accessed by a computer, and may include any computer storage medium.

While this specification contains numerous specific implementation details, they should not be construed as limitations on the scope of any invention or claim, but rather as descriptions of features that may be specific to particular embodiments of particular inventions. should be understood Certain features that are described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Furthermore, although features operate in a particular combination and may be initially depicted as claimed as such, one or more features from a claimed combination may in some cases be excluded from the combination, the claimed combination being a sub-combination. or a variant of a sub-combination.

Likewise, although acts are depicted in the figures in a particular order, it should not be construed that all acts shown must be performed or that such acts must be performed in the specific order or sequential order shown in order to achieve desirable results. In certain cases, multitasking and parallel processing may be advantageous. Further, the separation of the various device components of the above-described embodiments should not be construed as requiring such separation in all embodiments, and the program components and devices described may generally be integrated together into a single software product or packaged into multiple software products. You have to understand that you can.

On the other hand, the embodiments of the present invention disclosed in the present specification and drawings are merely presented as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

110: light emitting unit
120: light receiving unit
130: primary amplification stage
140: second amplification stage
150: processor
160: temperature sensor

Claims (14)

a light emitting unit for irradiating measurement light;
a light receiving unit for receiving the received light modulated by the fine dust contained in the atmosphere while the measurement light is irradiated;
a primary amplifying stage amplifying the received light to output a primary amplifying stage signal;
a secondary amplifying stage for filtering the primary amplifying stage signal, extracting a scattering signal generated by the fine dust, amplifying the scattering signal, and outputting a secondary amplifying stage signal; and
A processor for determining the concentration of dust contained in the atmosphere using the optical characteristic gain determined according to the first amplification stage signal and the light amount signal of the measurement light and the secondary amplification stage signal
including,
The processor is
Fine dust measuring device for calculating the concentration of dust contained in the air by applying the optical characteristic gain to the secondary amplification stage signal to correct the intensity of the secondary amplification stage signal to be within a standard range. According to claim 1,
The optical characteristic gain is
Fine dust measuring device determined according to a difference between optical characteristic reference information determined according to the primary amplification stage signal and light quantity signal of each of a plurality of samples and the primary amplification stage signal and light quantity signal measured at the time when the fine dust measuring device is manufactured . According to claim 1,
A temperature sensor that measures the current temperature
further comprising,
The processor is
The temperature gain is determined using the optical characteristic gain, the characteristic change information according to the temperature, the current temperature and the primary amplification stage signal and the light quantity signal, and the dust concentration contained in the atmosphere using the temperature gain and the secondary amplification stage signal A device for measuring fine dust to determine 4. The method of claim 3,
The processor is
When the current temperature is room temperature, the optical characteristic gain is determined as the temperature gain,
When the current temperature is a temperature higher than room temperature or a temperature lower than room temperature, a fine dust measuring apparatus for determining a temperature gain by correcting the optical characteristic gain according to information on a characteristic change according to the temperature. According to claim 1,
The processor is
When the first amplification stage signal or the light amount signal of the measurement light is less than the failure mode reference information determined in consideration of the decrease in optical characteristics due to continuous use, it is determined that a failure has occurred in the fine dust measuring device and the failure mode is driven. measuring device. delete delete delete irradiating measurement light;
receiving a reception light modulated by fine dust contained in the atmosphere while the measurement light is irradiated;
amplifying the received light to output a first amplification stage signal;
filtering the first amplification stage signal to extract a scattering signal generated by the fine dust, and amplifying the scattering signal to output a secondary amplifying stage signal; and
determining the concentration of dust contained in the atmosphere using the optical characteristic gain determined according to the first amplification stage signal and the light amount signal of the measurement light and the secondary amplification stage signal
including,
The step of determining the dust concentration comprises:
Fine dust measuring method for calculating the concentration of dust contained in the air by applying the optical characteristic gain to the secondary amplification stage signal to correct the intensity of the secondary amplification stage signal to be within a standard range. 10. The method of claim 9,
The optical characteristic gain is
A method for measuring fine dust determined according to a difference between optical characteristic reference information determined according to the primary amplification stage signal and light quantity signal of each of a plurality of samples and the primary amplification stage signal and light quantity signal measured at the time when the fine dust measuring device is manufactured . 10. The method of claim 9,
When the first amplification stage signal or the light amount signal of the measurement light is less than the failure mode reference information determined in consideration of the decrease in optical characteristics due to continuous use, determining that a failure has occurred in the fine dust measuring device and driving the failure mode
A method for measuring fine dust further comprising a. delete delete A computer-readable recording medium in which a program for executing the method of any one of claims 9 to 11 is recorded.

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