TW202409985A - Smoke detecting device - Google Patents

Abstract

A smoke detecting device according to the present invention is a two-light-reception smoke detecting device capable of correctly determining a smoke type even if deterioration occurs over time, for example. A two-light-reception smoke detecting device 1 comprises: a first light emitting unit 13 that emits polarized light; a first light receiving unit 14 having a first light reception axis C intersecting a light emission axis B of the first light emitting unit 13; a second light receiving unit 15 having a second light reception axis D intersecting the light emission axis B of the first light emitting unit 13; a signal amplifying unit 18; and a signal processing unit 19. The signal processing unit 19 determines the smoke type on the basis of a ratio of an amplitude value C2 to an amplitude value C1 during light emission by the first light emitting unit 13, the amplitude value C2 being obtained by multiplying, by a multiplication factor M2, an amplitude value of a signal obtained by using a signal amplifying unit 18 to amplify a signal generated by the second light receiving unit 15, and the amplitude value C1 being obtained by multiplying, by a multiplication factor M1, an amplitude value of a signal obtained by using the signal amplifying unit 18 to amplify a signal generated by the first light receiving unit 14. The signal processing unit 19 updates the multiplication factor M1 and the multiplication factor M2 such that the ratio of the amplitude value C2 to the amplitude value C1 is a predetermined ratio.

Description

Smoke detection device

The present invention relates to a device for detecting smoke.

There is a smoke detection device (smoke detector) that detects the generation of smoke in the space of the surveillance object by detecting the smoke contained in the space of the surveillance object. As one type of smoke detection device, there is a method called photoelectric type. The photoelectric smoke detection device detects smoke based on the signal generated when the light emitted from the light-emitting part is reflected by the smoke particles in the air flowing into the container from the outside and the reflected light is received by the light-receiving part. The container houses the light-emitting part and the light-receiving part.

Another type of photoelectric smoke detector is a two-light-receiving type. A two-light-receiving type smoke detector emits polarized light along the light-emitting axis from a light-emitting portion, and determines the type of smoke in the air based on the signal generated by two light-receiving portions having light-receiving axes intersecting in different directions with respect to the light-emitting axis.

As a patent document that discloses a dual-light-receiving type smoke detection device, there is Patent Document 1, for example. [Prior Art Document] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2011-203889

[The problem that the invention wants to solve]

When receiving light of the same intensity, the amplitude value of the signal generated by the light receiving unit is different for each product due to individual differences in the light receiving elements of the light receiving unit. Therefore, photoelectric smoke detection devices usually calculate the multiplier obtained by dividing the reference amplitude value by the amplitude value of the signal generated by the light receiving unit in a reference environment before shipment from the factory. When in use, the value obtained by multiplying the amplitude value of the signal generated by the relative light receiving unit by the calculated multiplier is used as the output value of the light receiving unit, so that in any product, the output value of the light receiving unit in the reference environment represents the reference intensity. As a result, for example, by comparing the output value of the light receiving unit with a specified threshold value, any smoke detection device can detect smoke with the same sensitivity.

When the smoke detection device is in operation, the output value of the light-receiving part will generally change slowly due to aging and deterioration of the light-receiving element, deposition of dirt on the light-emitting part and the light-receiving part, etc. The two-light-receiving type smoke detection device determines the type of smoke in the air based on the signal generated by each of the two light-receiving parts as described above. Therefore, if the output value of each of the two light receiving parts changes due to aging or deterioration, the smoke detection device may not be able to accurately determine the type of smoke.

In view of the above reasons, an object of the present invention is to provide a dual-light-receiving type smoke detection device that can accurately determine the type of smoke even if aging deterioration occurs. [Means used to solve problems]

In order to solve the above-mentioned problem, the present invention proposes a smoke detection device, which comprises: a light-emitting part that emits polarized light; a first light-receiving part having a first light-receiving axis intersecting with the light-emitting axis of the light-emitting part; a second light-receiving part having a second light-receiving axis intersecting with the light-emitting axis of the light-emitting part and in a different direction from the first light-receiving axis; a smoke determination part that detects smoke in the air based on a signal generated by the first light-receiving part when the light-emitting part emits light, and when smoke is detected, determines the type of smoke in the air based on a signal generated by the first light-receiving part when the light-emitting part emits light and a signal generated by the second light-receiving part when the light-emitting part emits light; and a magnification determination part. The determining unit determines the magnification by which at least one of the signal generated by the first light receiving unit and the signal generated by the second light receiving unit is multiplied, so that during the period when the smoke determining unit does not detect smoke in the air, the ratio of the amplitude value of the signal generated by the second light receiving unit when the light emitting unit emits light relative to the amplitude value of the signal generated by the first light receiving unit when the light emitting unit emits light becomes a prescribed value; wherein the smoke determining unit determines the type of smoke in the air based on the value obtained by multiplying the amplitude value of at least one of the signal generated by the first light receiving unit and the signal generated by the second light receiving unit by the magnification determined by the magnification determining unit. [Effect of the invention]

According to the smoke detection device of the present invention, the type of smoke can be accurately determined even if aging and deterioration occur. [Brief description of the diagram]

[Fig. 1] is a diagram schematically showing the structure of a smoke detection device according to one embodiment. 2 is a graph showing temporal changes in the amplitude value of the signal generated by the first light receiving unit of the smoke detection device according to one embodiment and amplified by the signal amplifying unit. [Fig. 3] shows the amplitude value of the signal generated by the second light receiving unit amplified by the signal amplifying unit in the smoke detection device according to one embodiment, relative to the signal amplified by the signal generated by the first light receiving unit. A graph showing the changes over time in the amplitude value and ratio of the partially amplified signal.

[Implementation method]

Hereinafter, the smoke detection device 1 according to an embodiment of the present invention will be described. The smoke detection device 1 is a two-light receiving type smoke detection device. FIG. 1 is a diagram schematically showing the structure of the smoke detection device 1 . However, in FIG. 1 , illustration of components irrelevant to the features of the present invention is omitted. FIG. 1(A) is a plan view of the smoke detection device 1 in a state in which the lid of the container is removed. FIG. 1(B) is a view of the cross-section indicated by the dotted line in FIG. 1(A) viewed in the direction of arrow A.

In the following description, for convenience, the extending direction of the paper surface depicted in FIG. 1(A) is assumed to be a horizontal plane.

The smoke detection device 1 includes: a first electronic circuit board 10, a second electronic circuit board 11, a third electronic circuit board 12, a first light emitting part 13, a first light receiving part 14, a second light receiving part 15, a light shielding member 16, The second light emitting part 17 , the signal amplifying part 18 , the signal processing part 19 , and the container 20 .

The first electronic circuit board 10 is an electronic circuit board arranged to stand vertically with respect to the horizontal plane. On the first electronic circuit substrate 10, a first light emitting part 13 is arranged.

The second electronic circuit board 11 is an electronic circuit board arranged in a direction along the horizontal plane. On the second electronic circuit board 11, a first light receiving part 14, a light shielding member 16, a second light emitting part 17, a signal amplifying part 18, and a signal processing part 19 are arranged.

The third electronic circuit board 12 is an electronic circuit board arranged to stand vertically relative to a horizontal plane. On the third electronic circuit board 12, a second light receiving unit 15 is arranged.

In addition, the signal amplifier 18 and the signal processor 19 may also be disposed on an electronic circuit substrate other than the second electronic circuit substrate 11 (eg, the first electronic circuit substrate 10 or the third electronic circuit substrate 12 ).

The first light emitting portion 13 emits polarized light in the direction of the light emitting axis (hereinafter referred to as "light emitting axis B") indicated by arrow B in FIG1. For example, when the polarized light emitted by the first light emitting portion 13 is linear polarized light, the direction of the straight line is perpendicular to the horizontal plane, and when the polarized light emitted by the first light emitting portion 13 is elliptical polarized light, the direction of the major axis of the ellipse is perpendicular to the horizontal plane.

The first light receiving unit 14 receives light in the direction of the first light receiving axis indicated by arrow C in FIG. signal. Hereinafter, the amplitude value of the signal generated by the first light receiving unit 14 is referred to as amplitude value A1. The first light-receiving axis C is an axis that intersects the light-emitting axis B at a predetermined angle in a vertical plane (a plane orthogonal to the horizontal plane) including the light-emitting axis B.

The second light-receiving unit 15 receives light in the direction of the second light-receiving axis indicated by arrow D in FIG. signal. Hereinafter, the amplitude value of the signal generated by the second light receiving unit 15 is referred to as amplitude value A2. The second light-receiving axis D is an axis that intersects the light-emitting axis B at a predetermined angle in the horizontal plane including the light-emitting axis B.

In addition, the angle between the light-emitting axis B and the first light-receiving axis C, and the angle between the light-emitting axis B and the second light-receiving axis D may be the same or different.

The light-shielding member 16 is a cylindrical light-shielding member and is arranged to surround the first light receiving portion 14 . The upper bottom surface of the light shielding member 16 has an opening, so that the light directed toward the first light receiving axis C reaches the first light receiving portion 14 . The light-shielding member 16 blocks light directed toward the first light-receiving part 14 in a direction intersecting the first light-receiving axis C. The light blocked by the light-shielding member 16 includes: light emitted from the first light-emitting part 13 and deflected from the light-emitting axis B toward the first light-receiving part 14; or light emitted from the first light-emitting part 13 and reflected in the container 20 toward the first light-emitting part 14. light from the first light receiving unit 14 . The light shielding member 16 serves a function of reducing the influence of these lights on the determination of the presence or absence of smoke or the determination of the type of smoke.

The second light-emitting part 17 emits unpolarized light, which is used to determine the direction of at least one of the container 20 and the structure in the container 20 (including the first light-emitting part 13, the first light-receiving part 14, and the second light-receiving part 15). degree of contamination. The light emitted by the second light-emitting part 17 is directed toward a wider area in the container 20 including the smoke detection area.

The second light emitting unit 17 is arranged at a position where the light directly directed from the second light emitting unit 17 to the first light receiving unit 14 is shielded by the light shielding member 16. Therefore, compared with the case where the light emitted by the second light emitting unit 17 directly reaches the first light receiving unit 14, when judging the damage, the amplitude value A1 of the signal generated by the first light receiving unit 14 will be reduced as a whole, and the change amount of the amplitude value A1 in the case of damage relative to the amplitude value A1 in the normal state will appear clearly. Therefore, it becomes easy to judge the degree of damage.

The signal amplifying section 18 is an amplifier (amp) that amplifies the signals generated by the first light receiving section 14 and the second light receiving section 15 . In this embodiment, the signal amplifying unit 18 amplifies the signal generated by the first light receiving unit 14 and the signal generated by the second light receiving unit 15 at the same amplification rate G.

Hereinafter, the amplitude value of the signal generated by the first light receiving unit 14 and amplified by the signal amplifying unit 18 is referred to as amplitude value B1. Amplitude value B1 is a value obtained by multiplying amplitude value A1 by amplitude increase rate G. Furthermore, the amplitude value of the signal generated by the second light receiving unit 15 and amplified by the signal amplifying unit 18 is called amplitude value B2. Amplitude value B2 is a value obtained by multiplying amplitude value A2 by amplitude increase rate G.

The signal processing unit 19 is a unit that performs data processing and has an A/D converter that converts the analog signal generated by the first light receiving unit 14 and the second light receiving unit 15 and amplified by the signal amplification unit 18 into a digital signal, a memory (storage unit) that stores data, a processor that processes data, a clock for timing, etc.

When the smoke detection device 1 is shipped from the factory, the initial values of the magnification (multiplication factor) M1 for the first light receiving unit 14 and the magnification M2 for the second light receiving unit 15 are stored in the memory. Furthermore, during operation of the smoke detection device 1, the magnification M1 and the magnification M2 are updated by a magnification determining unit described later.

The initial value of the magnification M1 is generated by dividing the predetermined reference value S by the first light receiving part 14 in an environment where the container 20 is filled with a predetermined concentration of white smoke (or a substitute for white smoke) and the first light emitting part 13 emits light. The signal is a value obtained by the amplitude value B1 of the signal amplified by the signal amplifying section 18. That is, the magnification M1 is set as an initial value in the smoke detection device 1 so that the value obtained by multiplying the amplitude value B1 in the above environment by the magnification M1 becomes the reference value S.

The initial value of the magnification M2 is the reference value S divided by the amplitude of the signal generated by the second light-receiving part 15 and amplified by the signal amplifying part 18 in an environment where the container 20 is filled with white smoke and the first light-emitting part 13 emits light. The value obtained by value B2. That is, the magnification M2 is set as an initial value in the smoke detection device 1 so that the value obtained by multiplying the amplitude value B2 in the above environment by the magnification M2 becomes the reference value S.

Hereinafter, the amplitude value obtained by multiplying the amplitude value B1 of the signal generated by the first light receiving unit 14 after being amplified by the signal amplifying unit 18 by the magnification M1 is referred to as the amplitude value C1 of the first light receiving unit 14. Furthermore, the amplitude value obtained by multiplying the amplitude value B2 of the signal generated by the second light receiving unit 15 after being amplified by the signal amplifying unit 18 by the magnification M2 is referred to as the amplitude value C2 of the second light receiving unit 15.

Here, the reference value S used in the calculation of the initial value of the magnification M1 and the reference value S used in the calculation of the initial value of the magnification M2 are set to the same value. Therefore, in an environment where the container 20 is filled with white smoke and the first light-emitting portion 13 emits light, the ratio of the amplitude value B2 to the amplitude value B1 (or the amplitude value C2 to the amplitude value C1) is 1. In addition, the reference value S used in the calculation of the initial value of the magnification M1 and the reference value S used in the calculation of the initial value of the magnification M2 can also be set to different values.

The signal processing unit 19 performs data processing according to a program stored in a memory through a processor, and functions as a device having a light emission control unit, a smoke determination unit, a pollution determination unit, a magnification determination unit, and an abnormality detection unit.

The light control unit instructs the first light emitting unit 13 and the second light emitting unit 17 to start and stop emitting light. In this embodiment, as an example, the smoke detection device 1 is set to operate in the smoke determination mode from 0:00 to 23:59 every day, and in the pollution determination mode from 23:59 to 24:00 (0:00 the next day).

The smoke determination mode is an operation mode for detecting smoke and determining the type of detected smoke. When the smoke determination mode starts, the light-emitting control unit instructs the first light-emitting part 13 to start light-emitting and instructs the second light-emitting part 17 to end light-emitting.

The contamination determination mode is a mode for determining the degree of contamination of at least one of the container 20 and the structure in the container 20. When the contamination determination mode starts, the light emission control unit instructs the first light emission unit 13 to end light emission and instructs the second light emission unit 17 to start light emission.

In addition, the lengths of the smoke determination mode and the stain determination mode are not limited to the above.

The smoke determination unit detects smoke in the air based on the signal generated by the first light receiving unit 14 in the smoke determination mode.

In order for the smoke determination unit to detect smoke, a threshold value U1 for smoke detection is stored in the memory. In the smoke determination mode, when the comparison result between the amplitude value C1 obtained by multiplying the amplitude value B1 of the signal generated by the first light receiving unit 14 amplified by the signal amplification unit 18 by the magnification M1 and the threshold value U1 satisfies a prescribed condition E1, the smoke determination unit determines that smoke is generated in the space around the smoke detection device 1. Condition E1 is, for example, a condition that the amplitude value C1 exceeds the threshold value U1 for a prescribed number of times and continuously in the comparison between the amplitude value C1 and the threshold value U1 repeatedly performed at prescribed time intervals, but is not limited thereto.

The smoke determination unit determines the type of smoke in the air in the space surrounding the smoke detection device 1 based on the signal generated by the first light receiving unit 14 when the first light emitting unit 13 emits light and the signal generated by the second light receiving unit 15 when the first light emitting unit 13 emits light, when smoke in the air in the space surrounding the smoke detection device 1 is detected by the above determination.

In order for the smoke determination unit to determine the type of smoke, for example, a threshold U2 for distinguishing between white smoke and gray smoke and a threshold U3 for distinguishing between gray smoke and black smoke are stored in the memory.

In addition, white smoke, gray smoke, and black smoke are examples of the types of smoke that the smoke determination unit can distinguish, and other types of smoke can also be distinguished. In addition, the number of thresholds used by the smoke determination unit in determining the type of smoke can be changed according to the number of types of smoke that the smoke determination unit can distinguish or the determination method.

When smoke is detected in the smoke determination mode, the smoke determination unit calculates the amplitude value C2 obtained by multiplying the amplitude value B2 of the signal generated by the second light receiving unit 15 and amplified by the signal amplification unit 18 by the magnification M2, so The ratio R of the amplitude value C1 obtained by multiplying the amplitude value B1 of the signal amplified by the signal amplifier 18 with respect to the signal generated by the first light receiving unit 14 by the magnification M1. Next, the smoke determination unit determines the type of smoke to be white smoke when the ratio R is less than the threshold U2, determines the type of smoke to be gray smoke when the ratio R is greater than the threshold U2 and less than the threshold U3, and determines the type of smoke to be gray smoke when the ratio R is greater than the threshold. At U3, the type of smoke is judged to be black smoke.

When smoke detection unit 1 detects smoke, the smoke detection device 1 performs predetermined processing such as: emitting a warning message such as "White smoke has occurred." from a speaker (not shown in FIG. 1 ), and displaying it on a display (liquid crystal). A warning message is displayed on a display or a seven-segment LED (not shown in Figure 1), a warning light (not shown in Figure 1) is illuminated, and smoke is sent from the communication unit (not shown in Figure 1) to the upper system Notice to detect and indicate the type of cigarette.

In the pollution determination mode, the pollution determination unit determines the degree of pollution of at least one of the container 20 and the structure in the container 20 based on at least one of the signal generated by the first light receiving unit 14 and the signal generated by the second light receiving unit 15 .

In order for the contamination determination unit to determine the degree of contamination, a threshold value U4 and a threshold value U5 for contamination determination are stored in the memory. In the contamination determination mode, for example, when the amplitude value C1 obtained by multiplying the amplitude value B1 of the signal generated by the first light receiving unit 14 amplified by the signal amplifying unit 18 by the magnification M1 is lower than the threshold value U4, or when the amplitude value C2 obtained by multiplying the amplitude value B2 of the signal generated by the second light receiving unit 15 amplified by the signal amplifying unit 18 by the magnification M2 is lower than the threshold value U5, the contamination determination unit determines that the degree of contamination of the container 20 or the structure in the container 20 exceeds the allowable range.

When the contamination determination unit determines that the degree of contamination exceeds the allowable range, the smoke detection device 1 emits a warning message such as "cleaning is required" from a speaker (not shown in FIG. 1 ), for example. , and a notification prompting the cleaning smoke detection device 1 to be sent from the communication unit (not shown in FIG. 1 ) to the upper system.

The magnification determining unit is used in the smoke detection device 1 to reduce the influence of aging, deterioration or contamination of the first light-emitting part 13, the first light-receiving part 14 and the second light-receiving part 15 on the determination result of the smoke determination part. The function of updating magnification M1 and magnification M2.

Therefore, the magnification determining unit uses the amplitude value of the signal generated by the second light receiving unit 15 relative to the signal generated by the first light receiving unit 14 in the smoke determining mode during a period when the smoke determining unit cannot detect smoke in the air. The magnification multiplied by at least one of the signal generated by the first light receiving unit 14 and the signal generated by the second light receiving unit 15 is determined so that the ratio of the amplitude values of the signals reaches a predetermined value.

In this embodiment, the magnification determining unit determines update values of both the magnification M1 and the magnification M2. Specific examples are shown below.

In order for the magnification determination unit to determine the update values of the magnification M1 and the magnification M2, the amplitude value γ1 and the amplitude value γ2 are stored in the memory when the smoke detection device 1 is shipped from the factory.

The amplitude value γ1 is the amplitude value B1 of the signal amplified by the signal amplification unit 18 multiplied by the signal generated by the first light receiving unit 14 in the smoke determination mode and in a smoke-free environment when the smoke detection device 1 is shipped from the factory. The value obtained by taking the initial value of the magnification M1.

The amplitude value γ2 is a value obtained by multiplying the amplitude value B2 of the signal generated by the second light receiving unit 15 amplified by the signal amplifying unit 18 by the initial value of the magnification M2 in the smoke determination mode in a smoke-free environment when the smoke detection device 1 is shipped from the factory.

In addition, in order for the magnification determination unit to determine the update values of the magnification M1 and the magnification M2, for example, a period of a predetermined time in the recent past (hereinafter referred to as 10 minutes) is continuously stored in the memory during operation of the smoke detection device 1 The measured amplitude value B1 and amplitude value B2 will be stored sequentially as log date.

For example, the magnification determining unit first identifies a period in which smoke was not detected in the recent past every time a predetermined period of time (for example, 30 days) elapses.

FIG. 2 is a graph showing the temporal change of the amplitude value B1 in the recent past for a predetermined period of time represented by the recording data stored in the memory. In the example of FIG. 2 , period T4 is a period in the stain determination mode, and other periods are periods in the smoke determination mode.

In the example of FIG2 , the magnification determination unit determines that the value obtained by multiplying the amplitude value B1 in the period T2 represented by the recorded data read from the memory by the magnification M1 at that time point continuously exceeds the threshold value U1. As a result, the magnification determination unit specifies the period T2 as a period in which smoke is detected, and specifies the other periods, namely, the periods T1, T3, T4, and T5, as periods in which smoke is not detected.

Next, the magnification determining unit determines the amplitude value B1 in the periods T1, T3, T5, which are the periods in which smoke is not detected, except the period T4, which is the period in the contamination determination mode. representative value, for example, the average value D1 of the amplitude value B1 during these periods is calculated. In addition, instead of the average value, the median value, the most frequent value (mode), or the like can also be used as the representative value.

Next, the magnification determining unit divides the amplitude value γ1 by the average value D1 to calculate the updated magnification M1. The updated magnification M1 calculated in this way is a magnification adjusted so that the amplitude value C1 calculated in the smoke detection mode in the smoke-free environment in the current smoke detection device 1 is consistent with the smoke detection device shipped from the factory. The amplitude value γ1 calculated in smoke-free environment in 1 and smoke judgment mode is consistent. The magnification determining unit overwrites the magnification M1 stored in the memory with the updated magnification M1 thus calculated.

Next, the magnification factor determination unit calculates, for example, the average value D2 of the amplitude value B2 in the periods T1, T3, and T5 as a representative value of the amplitude value B2 in these periods.

Next, the magnification determining unit divides the amplitude value γ2 by the average value D2 to calculate the updated magnification M2. The updated magnification M2 calculated in this way is a magnification adjusted so that the amplitude value C2 calculated in the smoke detection mode in the smoke-free environment in the current smoke detection device 1 is consistent with the smoke detection device shipped from the factory. The amplitude value γ2 calculated in smoke-free environment in 1 and smoke judgment mode is consistent. The magnification determining unit overwrites the magnification M2 stored in the memory with the updated magnification M2 calculated in this way.

As described above, the ratio of the amplitude value C1 to the amplitude value C2 calculated using the updated magnifications M1 and M2 determined by the magnification determination unit is consistent with the ratio of the amplitude value γ1 to the amplitude value γ2. That is, the magnification determination unit determines the updated magnifications M1 and M2 so that the ratio of the amplitude value C2 to the amplitude value C1 becomes the ratio of the amplitude value γ2 to the amplitude value γ1 given as the initial value.

As described above, by updating the magnification M1 and the magnification M2 by the magnification determination unit, the influence of aging, deterioration, contamination, etc. of the smoke detection device 1 on the determination result of the smoke determination unit can be reduced.

The abnormality detection unit is based on the amplitude value of the signal generated by the second light-receiving unit 15 relative to the signal generated by the first light-receiving unit 14 in the smoke determination mode during the period when the smoke determination unit cannot detect smoke in the air. The ratio of the amplitude values is used to detect abnormalities in the smoke detection device 1.

In order to detect an abnormality in the smoke detection device 1, the abnormality detection unit reads the recorded data from the memory every time a predetermined time elapses (for example, 5 minutes), and calculates the amplitude value B2 relative to the same timing indicated in the recorded data ( timing), the ratio P of the amplitude value B1 measured.

FIG. 3 is an example of a graph showing the temporal change of the ratio P calculated by the abnormality detection unit with respect to the past predetermined period. In the example of FIG. 3 , period T4 is a period in the stain determination mode, and period T2 is a period in which smoke is detected. In addition, the abnormality detection unit specifies the period during which smoke is detected using the same method as the magnification determination unit.

The abnormality detection unit detects that the ratio P changes discontinuously at time t1 among the periods T1, T3, and T5, which are periods in which smoke is not detected in the smoke determination mode. The abnormality detection unit specifies the time when the ratio P changes discontinuously based on the determination result of whether the rate of change of the moving average of the ratio P exceeds a predetermined threshold, but the time when the ratio P changes discontinuously may be determined by other known methods.

When the ratio P changes discontinuously, there is a high possibility that a failure has occurred in any component of the smoke detection device 1 or a failure has occurred due to heavy dust adhesion. Therefore, in this case, the abnormality detection unit determines that some abnormality has occurred in the smoke detection device 1 at time t1.

When the abnormality detection unit detects an abnormality in the smoke detection device 1, for example, the smoke detection device 1 emits a warning message such as "An abnormality has occurred." from a speaker (not shown in FIG. 1), and transmits a warning message from a communication unit (not shown in FIG. 1). (Illustration omitted) sends a notification indicating that an abnormality has occurred to the upper system.

As described above, the abnormality detection unit detects the abnormality of the smoke detection device 1 based on the ratio P of the amplitude value B2 to the amplitude value B1. As a result, for example, when the abnormality of the smoke detection device 1 is detected based only on the amplitude value B1, or only When an abnormality of the smoke detection device 1 is detected based on the amplitude value B2, the occurrence of an abnormality that is difficult to detect can be detected. For example, when dust is generated around the smoke detection device 1 and fine dust invades the container 20 , the amplitude value B1 and the amplitude value B2 change in conjunction with each other. Therefore, compared with the amplitude value B1 or the amplitude value B2, the ratio P is less likely to be affected by their interference. Therefore, by performing abnormality detection based on the ratio P, an abnormality that is not affected by these interferences can be easily detected.

The above is the description of the processing performed by the signal processing unit 19 .

The container 20 (see FIG. 1 ) is a component forming a dark space for detecting smoke, and contains the first light emitting unit 13, the first light receiving unit 14, the second light receiving unit 15, etc. The container 20 is provided with an inlet and an outlet. The inlet is a passage for air to flow into the interior from the space of the monitored object, and the outlet is a passage for the air flowing into the interior to flow out to the outside.

In addition, in addition to the components shown in Figure 1, the smoke detection device 1 may also have a fan, a filter, etc., for example. The fan forcibly generates a flow of air from the outside toward the container 20, and the filter is used to remove dust larger than the size of smoke particles from the air toward the container 20.

According to the above-mentioned smoke detection device 1, even if aging deterioration occurs, the type of smoke can be accurately determined.

[Variations] The above-mentioned embodiment is a specific example of the present invention, and various modifications can be made within the scope of the technical concept of the present invention. Examples of these modifications are shown below. In addition, two or more modifications shown below can be appropriately combined.

[Modification 1] In the above embodiment, the magnification determining unit determines based on the signals generated by the first light receiving unit 14 and the second light receiving unit 15 in a smoke-free environment in the smoke determination mode, that is, when the first light emitting unit 13 emits light. The updated magnification M1 and magnification M2. In this case, the signals generated by the first light-receiving part 14 and the second light-receiving part 15 are the light reflected on the inner wall surface of the container 20 or the structure in the container 20 among the light emitted by the first light-emitting part 13 . A signal generated by the reaction of stray light. Therefore, the amplitude value of the signal generated by the first light receiving part 14 and the second light receiving part 15 may be too small.

Therefore, the following configuration may be adopted: the magnification determination unit determines the updated magnifications M1 and M2 based on the signals generated by the first light receiving unit 14 and the second light receiving unit 15 in the pollution determination mode instead of the smoke determination mode, that is, when the second light emitting unit 17 is emitting light.

Hereinafter, the differences between the smoke detection device 1 according to this modification and the smoke detection device 1 according to the above-described embodiment will be described, and description of their common points will be omitted.

First, in this modification, an amplitude value γ1 and an amplitude value γ2 different from those in the above-described embodiment are stored in the memory at the time of shipment from the factory.

In the above-mentioned embodiment, the amplitude value γ1 and the amplitude value γ2 are based on the value of the signal generated by the first light receiving unit 14 or the second light receiving unit 15 in the smoke judgment mode. In contrast, in this variant, the amplitude value γ1 and the amplitude value γ2 are based on the value of the signal generated by the first light receiving unit 14 or the second light receiving unit 15 in the pollution judgment mode.

That is, in this modification, the amplitude value γ1 is obtained when the smoke detection device 1 is shipped from the factory, in the contamination determination mode, in a smoke-free environment, and the signal generated by the first light receiving unit 14 is passed through the signal amplification unit. 18 The value obtained by multiplying the amplitude value B1 of the amplified signal by the initial value of the magnification M1.

Furthermore, in this variation, the amplitude value γ2 is a value obtained by multiplying the amplitude value B2 of the signal generated by the second light receiving unit 15 amplified by the signal amplifying unit 18 in a smoke-free environment in the pollution judgment mode when the smoke detection device 1 is shipped from the factory by the initial value of the magnification M2.

Next, in this modification, as recorded data, for example, the amplitude value B1 and the amplitude value B2 measured in the pollution determination mode of the specified number of times in the past are stored. Hereinafter, as an example, it is assumed that the amplitude value B1 and the amplitude value B2 in the pollution determination mode of the five most recent times in the past are stored in the recorded data, and the period of these five times of pollution determination mode is set as the period T1 to T5.

In this modification, the multiplier determination unit calculates the average value of the amplitude value B1 and the amplitude value B2 in each of the periods T1 to T5 represented by the recorded data, for example, every time a predetermined time period (for example, 30 days) has passed. Hereinafter, the average value of the amplitude value B1 in each of the periods T1 to T5 is set as the average value F1(T1) to F1(T5), and the average value of the amplitude value B2 in each of the periods T1 to T5 is set as the average value F2(T1) to F2(T5).

In addition, the magnification determining unit calculates the average value of the passage periods T1 to T5 for each of the amplitude value B1 and the amplitude value B2. Hereinafter, the average value of the amplitude value B1 during the period T1 to T5 is referred to as the average value F1, and the average value of the amplitude value B2 during the period T1 to T5 is referred to as the average value F2.

If the difference between the average values F1(T1) to F1(T5) and the average value F1 is greater than a predetermined threshold, the multiplier determination unit excludes the period corresponding to the average value as the period in which smoke is detected. Furthermore, if the difference between the average values F2(T1) to F1(T5) and the average value F2 is greater than a predetermined threshold, the multiplier determination unit specifies the period corresponding to the average value as the period in which smoke is detected.

In the following, as an example, if the difference between the average value F1(T2) and the average value F1 is more than a predetermined threshold value, and if the difference between the average value F2(T2) and the average value F2 is more than a predetermined threshold value, the period T2 is designated as the detection period. During the period when smoke is detected, the periods T1, T3, T4, and T5 are specified as periods in which smoke is not detected.

Next, the magnification factor determination unit calculates an average value D1 of the amplitude value B1 during the periods T1, T3, T4, and T5 during which smoke is not detected. Furthermore, the magnification factor determination unit calculates an average value D2 of the amplitude value B2 during the periods T1, T3, T4, and T5 during which smoke is not detected.

Next, the magnification determining unit divides the amplitude value γ1 by the average value D1 to calculate the updated magnification M1. The updated magnification M1 calculated in this way is a magnification adjusted so that the amplitude value C1 calculated in the smoke detection device 1 in the contamination determination mode in a smoke-free environment at the current point is consistent with the smoke detection at the time of shipment from the factory. In the device 1, the amplitude value γ1 calculated in the smoke-free environment in the stain determination mode is consistent. The magnification determining unit overwrites the magnification M1 stored in the memory with the updated magnification M1 thus calculated.

Next, the magnification determination unit divides the amplitude value γ2 by the average value D2 to calculate the updated magnification M2. The updated magnification M2 calculated in this way is a magnification adjusted so that the amplitude value C2 calculated in the smoke detection device 1 in the contamination determination mode in the smoke-free environment at the current point is consistent with the smoke detection at the time of shipment from the factory. In the device 1, the amplitude value γ2 calculated in a smoke-free environment in the stain determination mode is consistent. The magnification determining unit overwrites the magnification M2 stored in the memory with the updated magnification M2 thus calculated.

As described above, the ratio of the amplitude value C1 to the amplitude value C2 calculated using the updated magnification M1 and the magnification M2 determined by the magnification determining unit is consistent with the ratio of the amplitude value γ1 to the amplitude value γ2. That is, the magnification determination unit determines the updated magnification M1 and magnification M2 so that the ratio of the amplitude value C2 to the amplitude value C1 becomes the ratio of the amplitude value γ2 to the amplitude value γ1 given as the initial value.

According to this variation, even when the amplitude value of the signal generated by the first light receiving unit 14 and the second light receiving unit 15 in response to the stray light of the light emitted by the first light emitting unit 13 is too small, the magnification M1 and the magnification M2 are updated based on a sufficiently large amplitude value of the signal generated by the first light receiving unit 14 and the second light receiving unit 15 in response to the light emitted by the second light emitting unit 17, thereby reducing the influence of aging, deterioration or contamination of the smoke detection device 1 on the judgment result of the smoke judgment unit.

[Modification 2] In the above embodiment, the magnification determining unit calculates the updated magnification M1 and the magnification M2 respectively. That is, the magnification determining unit calculates the updated magnification M1 based on the amplitude value γ1, and calculates the updated magnification M2 based on the amplitude value γ2. Alternatively, the magnification determining unit may determine the updated magnification M2 based on the updated magnification M1.

In this modification, the amplitude value γ1 and the ratio Q are stored in the memory at the time of shipment from the factory. The amplitude value γ1 is the same value as the amplitude value γ1 in the above-described embodiment. The magnification determining unit determines the updated magnification M1 using the amplitude value γ1, similarly to the case of the above-mentioned embodiment.

The ratio Q is the ratio of the amplitude value γ2 to the amplitude value γ1 in the above-described embodiment.

The magnification determination unit calculates the updated magnification M2 so that the ratio of the amplitude value C2 calculated using the updated magnification M2 to the amplitude value C1 calculated using the updated magnification M1 is the ratio Q. That is, the magnification determination unit multiplies the average value of the amplitude value B1 during the period when no smoke is detected in the smoke determination mode represented by the recorded data by the updated magnification M1, and then multiplies the value by the ratio Q. , divided by the average value of the amplitude value B2 during the period when no smoke was detected in the smoke determination mode represented by the recorded data, to calculate the updated magnification M2.

In the above example, the method for determining the updated magnification M1 in the modification is the same as the method for determining the updated magnification M1 in the above embodiment. As a result, the updated magnification M2 determined in the modification is the same as the updated magnification M2 determined in the above embodiment.

However, in this modification, the updated magnification M1 can be determined by a method different from the above-mentioned embodiment. In this modification, no matter which method is adopted as the method for determining the updated magnification M1, the ratio of the amplitude value C2 to the amplitude value C1 calculated using the updated magnification M1 and the magnification M2 becomes a constant, that is, the ratio Q.

The above-mentioned modification 2 can also be combined with the above-mentioned modification 1. In this case, the amplitude value γ1 which is the same as the amplitude value γ1 in the above-mentioned modification 1 and the ratio Q which is the ratio of the amplitude value γ2 in the above-mentioned modification 1 to the amplitude value γ1 can be stored in the memory at the time of factory shipment.

[Modification 3] In the above embodiment, the signal amplifier 18 included in the smoke detection device 1 is not essential. When the smoke detection device 1 does not include the signal amplifier 18, the amplitude value A1 is used instead of the amplitude value B1 in the above embodiment, and the amplitude value A2 is used instead of the amplitude value B2 in the above embodiment.

[Variant 4] In the above embodiment, the signal amplifier 18 amplifies the signal generated by the first light receiving unit 14 and the signal generated by the second light receiving unit 15 at the same amplification rate, but the signal amplifier 18 can also amplify these signals at different amplification rates.

1: Smoke detection device 10: First electronic circuit substrate 11: Second electronic circuit substrate 12: Third electronic circuit substrate 13: First light-emitting unit 14: First light-receiving unit 15: Second light-receiving unit 16: Light-shielding component 17: Second light-emitting unit 18: Signal amplification unit 19: Signal processing unit 20: Container

1: Smoke detection device

10: The first electronic circuit substrate

11: Second electronic circuit substrate

12:Third electronic circuit substrate

13:First Luminous Department

14: First light receiving part

15: Second light receiving part

16:Light-shielding parts

17: The second luminous part

18: Signal amplification part

19:Signal processing department

20:Container

A: Arrow

B: Luminous axis

C: First light receiving axis

D: Second light receiving axis

Claims (10)

A smoke detection device having: a light-emitting part that emits polarized light; The first light-receiving part has a first light-receiving axis intersecting with the light-emitting axis of the aforementioned light-emitting part; The second light-receiving part has a second light-receiving axis that intersects the light-emitting axis of the aforementioned light-emitting part and is in a different direction from the aforementioned first light-receiving axis; The smoke determination unit detects smoke in the air based on a signal generated by the first light receiving unit while the light emitting unit is emitting light, and when smoke is detected, based on a signal generated by the first light receiving unit while the light emitting unit is emitting light. The signal is combined with the signal generated by the second light-receiving part when the light-emitting part is emitting light to determine the type of smoke in the air; and The magnification determining unit determines a magnification by which at least one of the signal generated by the first light receiving unit and the signal generated by the second light receiving unit is multiplied so that the smoke determining unit does not detect smoke in the air. During this period, the ratio of the amplitude value of the signal generated by the second light-receiving part while the light-emitting part is emitting light to the amplitude value of the signal generated by the first light-receiving part while the light-emitting part is emitting light becomes a predetermined value; Wherein, the smoke determination unit is a value obtained by multiplying the amplitude value of at least one of the signal generated by the first light receiving unit and the signal generated by the second light receiving unit by the magnification determined by the magnification determining unit. , to determine the type of smoke in the air. The smoke detection device according to claim 1 is provided with: A storage unit that stores the amplitude value of the signal generated by the first light receiving unit; Wherein, the magnification determining unit reads the amplitude value of the signal generated by the first light receiving unit while the light emitting unit emits light from the storage unit during a period in which the smoke determining unit does not detect smoke in the air. The magnification for the first light-receiving part multiplied by the signal of the first light-receiving part is determined so that the amplitude value becomes a predetermined value: The smoke determination unit detects smoke in the air based on a value obtained by multiplying the magnification for the first light receiving unit with respect to an amplitude value of a signal generated by the first light receiving unit when the light emitting unit emits light. The smoke detection device according to claim 2, wherein: The polarized light emitted by the aforementioned light-emitting part is linearly polarized light or elliptically polarized light; The plane including the first light-receiving axis and the light-emitting axis of the light-emitting part is a plane with respect to the direction of a straight line including the linearly polarized light emitted by the light-emitting part, or the major axis of an ellipse including the elliptically polarized light emitted by the light-emitting part. In terms of faces, it is parallel; The plane including the second light-receiving axis and the light-emitting axis of the light-emitting part is a plane with respect to the direction of the straight line including the linearly polarized light emitted by the light-emitting part, or the major axis of the ellipse including the elliptically polarized light emitted by the light-emitting part. In terms of the surface, it is vertical; The magnification determining unit determines the magnification for the second light-receiving part based on the magnification for the first light-receiving part. The smoke detection device according to claim 1 is provided with: The abnormality detection unit determines the value of the signal generated by the second light-receiving unit when the light-emitting unit is emitting light during a period when the smoke determination unit does not detect smoke in the air, relative to when the light-emitting unit is emitting light. The ratio of the amplitude value of the signal generated by the first light-receiving part detects the abnormality of its own device. A smoke detection device comprises: a first light-emitting portion emitting polarized light; a first light-receiving portion having a first light-receiving axis intersecting with the light-emitting axis of the first light-emitting portion; a second light-receiving portion having a second light-receiving axis intersecting with the light-emitting axis of the first light-emitting portion and having a different direction from the first light-receiving axis; a smoke determination portion detecting smoke in the air based on a signal generated by the first light-receiving portion during the light-emitting of the first light-emitting portion, and determining the type of smoke in the air based on the signal generated by the first light-receiving portion during the light-emitting of the first light-emitting portion and the signal generated by the second light-receiving portion during the light-emitting of the first light-emitting portion when smoke is detected; a second light-emitting portion emitting non-polarized light; and The magnification determination unit determines the magnification by which at least one of the signal of the first light receiving unit and the signal of the second light receiving unit is multiplied, so that the ratio of the amplitude value of the signal generated by the second light receiving unit during the light emission of the second light emitting unit to the amplitude value of the signal generated by the first light receiving unit during the light emission of the second light emitting unit becomes a prescribed value; Wherein, the smoke determination unit determines the type of smoke in the air based on the value obtained by multiplying the amplitude value of at least one of the signal generated by the first light receiving unit and the signal generated by the second light receiving unit by the magnification determined by the magnification determination unit. The smoke detection device according to claim 5 comprises: A pollution determination unit that determines the degree of pollution of at least one of a container forming a space for detecting smoke and a structure in the container based on at least one of a signal generated by the first light receiving unit when the second light emitting unit emits light and a signal generated by the second light receiving unit when the second light emitting unit emits light. According to claim 5, the smoke detection device comprises: A storage unit storing the amplitude value of the signal generated by the first light receiving unit; wherein the magnification determination unit reads the amplitude value of the signal generated by the first light receiving unit during the emission of light by the second light emitting unit from the storage unit during the past period when the smoke determination unit did not detect smoke in the air, and determines the magnification for the first light receiving unit to be multiplied by the signal of the first light receiving unit in such a way that the amplitude value becomes a predetermined value: The smoke determination unit detects smoke in the air based on the value obtained by multiplying the amplitude value of the signal generated by the first light receiving unit during the emission of light by the magnification for the first light receiving unit. The smoke detection device according to claim 5, wherein: The polarized light emitted by the first light-emitting part is linearly polarized light or elliptically polarized light; The plane including the first light-receiving axis and the light-emitting axis of the first light-emitting part is a plane with respect to the direction of a straight line including the linearly polarized light emitted by the first light-emitting part, or a plane including the elliptically polarized light emitted by the first light-emitting part. The major axis of the ellipse of light is parallel; The plane including the second light-receiving axis and the light-emitting axis of the first light-emitting part is a plane with respect to the direction of the straight line including the linearly polarized light emitted by the first light-emitting part, or the plane including the elliptically polarized light emitted by the first light-emitting part. The major axis of the ellipse of light is vertical; The magnification determining unit determines the magnification for the second light receiving unit based on the magnification for the first light receiving unit. The smoke detection device according to claim 5 comprises: An abnormality detection unit for detecting an abnormality of the device itself based on the ratio of the amplitude value of the signal generated by the second light receiving unit during the period when the smoke determination unit does not detect smoke in the air to the amplitude value of the signal generated by the first light receiving unit during the period when the first light emitting unit emits light. The smoke detection device according to claim 1 or 5, having: a signal amplifying section that amplifies the signal generated by the first light-receiving section and the signal generated by the second light-receiving section; Wherein, the aforementioned magnification determination unit and the aforementioned smoke determination unit use the amplitude value of the signal in which the aforementioned signal amplification unit amplifies the signal generated by the aforementioned first light receiving unit, instead of the amplitude value of the signal generated by the aforementioned first light receiving unit, In addition, the signal amplifying unit is used to amplify the signal generated by the second light-receiving unit, and the amplitude value of the signal is replaced by the amplitude value of the signal generated by the second light-receiving unit.

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