Fire alarm system for a building and buildings with the fire alarm system

Abstract

Fire alarm device (2) for a building (1), with at least one light emitter device (3) for emitting light radiation (L) and at least one light detection device (4) for detecting the light radiation (L), with an absorption measurement section (A) that runs from the light emitter device (3) to the light detection device (4), wherein in a detection state of the fire alarm device (2) a light path (LW) of the light radiation (L) runs along the absorption measuring section (A), with an evaluation unit (7), the fire alarm device (2) has at least one position information sensor for detecting position information of the light emitter device (3) and / or the light detection device (4), wherein the evaluation device (7) is designed for evaluating the position information, characterized by the fact that the evaluation unit (7) includes a control module (10) for checking a deviation criterion for the situation information, wherein the evaluation unit (7) is designed to take action when the deviation criterion is met, the evaluation device (7) comprises a control module (12), wherein the control module (12) is controlled by the control module (10) and the control module (12) is configured to control a change in the light path (LW) as a measure when the deviation criterion is met, wherein the control module (12) is configured to control a change in the light path (LW) such that the light path (LW) runs along a new absorption measurement section (A) and is tracked, wherein a change in the position of the light emitter device (3) and / or the light detection device (4) results in the new absorption measurement section (A), which is shifted and differs from the original absorption measurement section (A).

Description

State of the art

[0001] The invention relates to a fire alarm device for a building, comprising at least one light emitter for emitting light radiation and at least one light detection device for detecting the light radiation, with an absorption measuring section extending from the light emitter to the light detection device, wherein, in a detection state of the fire alarm device, a light path of the light radiation runs along the absorption measuring section, and with an evaluation device. The invention further relates to a building with the fire alarm device.

[0002] Automatic fire alarm systems are commonly used for the early detection of fires in public or private premises. Such fire alarm systems typically include at least one fire detector, which detects a fire in its vicinity at an early stage based on fire-specific parameters such as smoke, soot particles, temperature, or gas concentrations, and can trigger an alarm. Within fire alarm technology, detectors with a linear measuring path are established. These emit light over a long distance using an optical light source, which is then detected by a receiver along the measuring path.

[0003] The publication DE 10 2007 021 677 A1, which probably represents the closest prior art, discloses a device for the absorption spectroscopic detection of at least one combustion gas in an open volume, wherein the infrared light source, the reflection system and / or the light detector can be aligned by an automated adjustment system so that the light emitted by the infrared light source travels the light path from the infrared light source through the open volume to the light detector.

[0004] From WO 2014 / 020 197 A1, a system for the automatic detection of suspended particles based on the detection of electromagnetic radiation scattered by these particles is known. Detection is achieved by the controlled emission of a single beam of electromagnetic radiation directed at the particle mass. Upon impact with the mass, this beam is scattered in all directions, so that a portion of this scattered radiation reaches the system itself, where it is detected and identified. The emitter of the beam and the receiver of the scattered radiation can be located at the same location or at different locations.

[0005] The following is known from US patent 2014 / 0191875A1: A method comprises reading a digital signal from a sensor in an area of ​​a structure, wherein the digital signal is configured to be periodic. The falling edge of the digital signal is detected. An analog signal is read from the sensor device, wherein the analog signal includes an output signal from a sensor contained in the sensor device, and the sensor is configured to detect an aspect of the environment. The analog signal is read after the falling edge of the digital signal. Disclosure of the invention

[0006] The invention discloses a fire alarm device with the features of claim 1 and a building with the features of claim 10. Preferred or advantageous embodiments of the invention are described in the dependent claims, the following description, and the accompanying figures.

[0007] The invention relates to a fire detection device capable of detecting fires in buildings, particularly airports, shopping centers, office buildings, subway stations or train stations, as well as sports halls, warehouses or production facilities, for example in corridors or rooms of the building. Preferably, the fire detection device is designed as a linear detector, particularly as a linear fire gas detector. In particular, the fire detection device can be installed, for example, on a wall and / or on a ceiling and / or near the ceiling. It is especially preferred that the fire detection device be installed in the upper third of a room in the building. The fire detection device is preferably a component of an alarm system and is particularly preferably signal-connected to or connected with one or more fire detection devices and / or with a fire alarm control panel. Optionally, the fire detection device additionally includes a siren for emitting an audible fire warning.

[0008] The fire alarm device comprises at least one light emitter for emitting light radiation. The light radiation emitted by the light emitter preferably has a wavelength in the range of 200 nm to 2000 nm. In particular, the light emitter comprises an LED, preferably an infrared LED or a UV LED, specifically a laser LED, for emitting the light radiation. Preferably, the emission angle of the light radiation, measured as the full width at half maximum (FWHM), is less than 3°, and in particular less than 1°.

[0009] Furthermore, the fire alarm device includes a light detection device for detecting light radiation. The light detection device comprises a sensor, preferably a photodiode, for measuring the light radiation. The light detection device is particularly preferably configured to measure only a specific wavelength range of the light radiation emitted by the light emitter. Preferably, the light detection device includes an optical filter positioned in front of the sensor for selectively detecting the light radiation emitted by the light emitter. In particular, the optical filter is designed to filter out or at least reduce stray light or ambient light. For example, the optical filter can be an interference filter.

[0010] The fire alarm device forms an absorption measurement section that extends from the light emitter to the light detection device. Preferably, the length of the absorption measurement section is more than 1 m, particularly more than 10 m, and most preferably more than 50 m. In a detection state of the fire alarm device, a light path of the light radiation travels from the light emitter to the light detection device along the absorption measurement section. Preferably, in the detection state, the light emitter and the light detection device are aligned such that the light path and the absorption measurement section form a common path. The detection of combustion gases is achieved by evaluating the light intensity of the light radiation received by the light detection device. When the light radiation is absorbed or scattered by combustion gases along the absorption measurement section, a decrease in light intensity occurs.If only a defined proportion of the light radiation emitted by the light emitter reaches the light detection device, it can be assumed that the emitted light radiation is scattered or absorbed by smoke particles or flue gases. For example, a fire is detected when the measured light intensity falls below a predefined intensity threshold during absorption measurement. Preferably, the fire alarm device includes a circuit for generating a sensor signal based on the measured light radiation from the light detection device. Particularly preferably, the fire alarm device includes a monitoring device, wherein the monitoring device is configured to detect the fire based on the sensor signal. Preferably, the monitoring device is coupled to the alarm system and / or the siren via a signaling system to issue a fire alarm.

[0011] The fire alarm device comprises at least one evaluation unit, which is preferably designed as a digital data processing unit, in particular as a microcontroller or the like. Preferably, the evaluation unit comprises at least one module, which is preferably designed as a hardware module and / or as a software module. The evaluation unit is preferably arranged centrally. Alternatively, the evaluation unit can be arranged decentrally. It is particularly preferred that the evaluation unit is arranged in a housing of the light emitter unit and / or in a housing of the light detection unit. Optionally, the monitoring unit can also be arranged in the evaluation unit.

[0012] Within the scope of the invention, it is proposed that the fire alarm device comprises at least one position information sensor for acquiring position information of the light emitter device and / or the light detection device. The position information preferably includes an absolute position and / or a relative position of the light emitter device and / or the light detection device. The absolute position and / or the relative position is defined, in particular, by a global reference system, especially preferably by a world coordinate system, and / or an arbitrary reference system. The position information includes a position and / or an orientation and / or a change in orientation and / or a change in position of the light emitter device or the light detection device.

[0013] Preferably, the position information sensor is arranged and / or configured additionally, particularly supplementarily and / or independently, to the light detection device. It is especially preferred that the position information sensor is functionally independent of the light detection device with respect to the measurement method. The additional arrangement of the position information sensor allows a change in the position of the fire alarm device or its components to be detected independently of the detected light intensity. The position information sensor can be arranged in the light emitter device and / or the light detection device. Preferably, a first position information sensor is arranged in the light emitter device and a second position information sensor is arranged in the light detection device, thus enabling the position of both devices to be monitored independently of each other.The position information sensor is preferably configured to transmit the position information to the evaluation unit. Transmission preferably occurs via analog data transmission, or alternatively via digital data transmission. Depending on the design of the fire alarm device and / or the arrangement of the evaluation unit, transmission can also occur wirelessly, preferably via Bluetooth. The evaluation unit is configured to evaluate the position information transmitted by the position information sensor; for this purpose, the position information can preferably be viewed, in a simplified representation, as the input signal. In particular, the position information sensor and the evaluation unit are interconnected via signal technology, especially wired or wirelessly. Furthermore, the evaluation unit is configured to convert the input signal into an output signal.

[0014] The advantage of the invention is that changes in positional information, particularly the positional information of the light emitter device and / or the light detection device, can be detected by means of positional information sensors. For example, the use of positional information sensors is particularly useful when fluctuations in a building structure occur due to environmental influences such as strong winds or temperature-related changes in length. Because the positional information sensors are not dependent on the individual components of the fire alarm system for fire detection, they can independently detect changes in the position of the fire alarm system or its components, preferably independently of the detected light intensity. This enables reliable operation of the fire alarm system. Furthermore, a drop in the light intensity level can be more clearly attributed to fire detection.Changes caused by building sway would, however, be detected prematurely by the position information sensors and could, for example, be taken into account as a disturbance variable when evaluating the light intensity level. The position information sensor system preferably comprises exactly one, at least one, or more position information sensors. The position information sensor includes all sensor types designed to detect position information or partial position information. In particular, the position information sensor is configured as an inertial sensor, a geomagnetic field sensor, or a satellite navigation data sensor. The inertial sensor is, in particular, an accelerometer and / or a gyroscope. Preferably, several such inertial sensors can be combined with each other as a position information sensor system to measure the acceleration of several, in particular all, degrees of freedom.The Earth's magnetic field sensor is preferably a sensor that orients itself to the Earth's magnetic field; in particular, an Earth's magnetic field sensor can be designed as a Hall sensor. The attitude information sensor can preferably also comprise several Earth's magnetic field sensors. The satellite navigation data sensor is preferably a global satellite navigation data sensor; in particular, the satellite navigation data sensor can be a GPS sensor. For example, by using a satellite navigation data sensor in the attitude information sensor, a position on Earth can be used as attitude information. The attitude information sensor can preferably also comprise several satellite navigation data sensors. In order to be able to capture as many degrees of freedom as possible, in particular all degrees of freedom, the attitude information sensor can comprise several attitude information sensors.For example, a Hall sensor can be used to determine the orientation and supplemented with a GPS sensor to determine the position.

[0015] The evaluation unit comprises a control module for checking a deviation criterion for the position information. In particular, the deviation of actual position information from target position information is used as the deviation criterion. Preferably, at least one reference value, especially a limit value and / or a target value, is defined in the control module as the first position information. After initial installation, if the light emitter and the light detection device are aligned in the detection state, the position information acquired by the position information sensors can be defined as reference values ​​for the first position information, the target position. If the position and / or orientation of the light emitter and / or the light detection device changes during operation, a second position information is generated, for example, an actual position.Preferably, the control module is configured to detect a deviation of the second position information from the reference value, particularly from the first position information. The verification of the deviation criterion can be implemented, for example, using a truth table. The reference value can be stored in the truth table. Preferably, the reference value can be stored in the control module after the installation of the light emitter device and / or the light detection device, or it can be stored as a criterion in the truth table. If the deviation criterion is met, the control module takes action. This action can, in particular, be the output of a control signal, which is transmitted to at least one other module.

[0016] In one possible embodiment of the invention, the evaluation unit comprises a fault module. The fault module is preferably controlled by the control module, preferably via the control signal. The fault module is preferably configured to generate and / or output a fault message as a measure for fulfilling the deviation criterion. In particular, a fault message can be output when the reference value is exceeded, thus fulfilling the deviation criterion. The fault message can be transmitted, for example, to the fire alarm control panel or as a message to a portable device, such as a mobile phone. Optionally, the fault message can be output as a visual or audible warning signal. The output of the warning signal is particularly preferably clearly distinguishable from the output of the fire alarm.Alternatively or optionally, the error message can be used as an input signal for another module.

[0017] The evaluation unit includes a control module as an additional module. The control module is configured to modify or control a change in the light path as a measure to fulfill the deviation criterion. A change in the position of the light emitter and / or light detection device results in a new absorption measurement section that is shifted or differs from the original absorption measurement section. The control module is configured to control a change in the light path such that the light path runs along the new absorption measurement section or is tracked along it. Preferably, the control module is configured to evaluate the control signal transmitted by the control module. Alternatively or additionally, the control module is configured to use the position information acquired by the position information sensors to track the light path. The control module is controlled by the control module.Preferably, the control can be direct and / or indirect. With direct control of the control module, the control module is directly controlled by the monitoring module. Preferably, due to the fulfillment of the deviation criterion, a control signal is transmitted directly to the control module as a measure. With indirect control, at least one further module can be interposed between the monitoring module and the control module. Particularly preferably, this further module is configured as the fault module. Specifically, the fault message sent by the fault module can be used as a control signal for the control module.

[0018] A preferred design provides that the fire alarm device includes at least one adjustment mechanism. Preferably, the adjustment mechanism is designed as an actuator. Particularly preferably, the actuator is designed to perform a translational and / or rotational movement in at least or exactly one, several, and especially all spatial directions. Furthermore, a control module is provided for controlling the adjustment mechanism. Preferably, the control module and the adjustment mechanism are interconnected via a signal. In particular, the adjustment mechanism converts a signal sent by the control module into a mechanical movement. The adjustment mechanism is preferably supplied with an external operating voltage via a cable. Optionally, the adjustment mechanism can also be self-contained, in particular battery-operated.The adjustment device is designed to change the light path, so that the control module can change the light path by controlling the adjustment device in such a way that the light path of the absorption measuring section is followed.

[0019] In a preferred embodiment, the adjustment device is configured to adjust the light emitter assembly and / or the light detection device. Preferably, the adjustment device is connected to a housing of the light emitter assembly and / or the light detection device. Optionally, the adjustment device can also be integrated into the housing. This allows, for example, the adjustment of the LED and / or the photodiode. Preferably, the light emitter assembly and / or the light detection device are adjustable independently of each other.

[0020] By tracking the light path, a further advantage of the invention is that a relatively small measurement spot for the light emission from the light emitter can be selected when the light emission strikes the light detection device. The position information sensor can detect even slight changes in position, which are compensated for by the control module or the adjustment device, so that the light emitter is always aligned with the light detection device. The reduced requirement for the area of ​​the measurement spot reduces the power consumption of the light emitter. Furthermore, the false alarm rate of the fire alarm system is reduced, since a fire cannot be triggered by a change in the light intensity of the light emission at the light detection device resulting from a deviation of the light path from the absorption measurement section.In addition to taking into account changes in position information when evaluating the recorded light intensity, active tracking of the light path can prevent changes in light intensity resulting from deviations of the light path from the absorption measurement distance.

[0021] In a further embodiment, the fire alarm device comprises a reflector assembly, wherein the absorption measuring path runs from the light emitter assembly via the reflector assembly to the light detection assembly. Preferably, the light emitter assembly and the light detection assembly are arranged directly adjacent to each other, with the light radiation emitted by the light emitter assembly being reflected by the reflector assembly. Optionally, the light emitter assembly and the light detection assembly can be arranged separately. The reflector assembly is particularly preferably designed as a retroreflector. In particular, the reflector assembly can comprise several retroreflectors. An adjustment device, or a further adjustment device, is designed for adjusting the reflector assembly.In particular, the adjustment mechanism of the reflector assembly can be arranged in addition to the adjustment mechanism in the light emitter assembly and / or the light detection assembly. Alternatively, the fire alarm device with the reflector assembly does not include an adjustment mechanism; preferably, the fire alarm device with the reflector assembly includes at least one position information sensor.

[0022] In another design implementation, the light emitter and the light detection device are arranged opposite each other. Specifically, the light emitter and the light detection device are arranged on two opposite walls, preferably at the same height. In a preferred embodiment of the invention, the fire alarm device is designed as a linear detector. Preferably, the linear detector is a linear detector according to DIN EN 54-12. Particularly preferably, the fire alarm device is installed according to DIN VDE 0833-2.

[0023] Another object of the invention is a building with the fire alarm device as previously described or according to one of the preceding claims.

[0024] Further features, advantages, and effects of the invention will become apparent from the following description of preferred embodiments of the invention and the accompanying figures. These show: Fig. 1 a schematic representation of a fire alarm device with position information sensors in a building; Fig. 2 a schematic representation of an operating situation of the fire alarm device in the Fig. 1 in the building after an impact of force; Fig. 3 a schematic representation of another operating situation of the fire alarm device in the Fig. 1 according to an alignment; Fig. 4 a schematic representation of another fire alarm device with a reflector device in a building; Fig. 5 a schematic representation of another fire alarm device with an alternative arrangement of the reflector device in a building; Fig. Figure 6 shows a schematic representation of an evaluation unit for the fire alarm devices in the preceding figures.

[0025] Corresponding or identical parts are each provided with the same reference symbols in the figures.

[0026] Fig. Figure 1 shows a building 1 with the fire alarm device 2 as an embodiment of the invention, wherein the building 1 can be, for example, a production hall or any other building. The fire alarm device 2 comprises a light emitter 3 for emitting light radiation L and a light detection device 4 for detecting the light radiation L. The light emitter 3 and the light detection device 4 are spaced apart and mounted on opposite walls 6 and near the ceiling of the building 1. The fire alarm device 2 is designed as a linear fire gas detector.

[0027] The light emitter device 3 has an LED as its central component, the LED being, for example, an infrared LED, UV LED, laser LED, or similar. The LED is arranged in a housing of the light emitter device 3.

[0028] The light detection device 4 has, as its central component, for example, a photodiode as a sensor for measuring the light radiation L, wherein the photodiode is arranged in a housing of the light detection device 4. An optical filter for selectively detecting the light radiation L emitted by the light emitter device 3 can, for example, be arranged in front of the photodiode. The optical filter is, for example, an interference filter.

[0029] The light radiation L travels from the LED to the photodiode, forming a light path LW. After the initial installation of the fire alarm device 2, the light path LW is aligned so that the light radiation L strikes the light detection device 4 centrally. The light radiation L exhibits, for example, its highest intensity in the center. The light radiation L emitted by the light emitter device 3, or by the LED, forms an emission angle alpha. For example, the emission angle alpha, measured as the full width at half maximum (FWHM), is less than 3°, and in particular less than 1°.

[0030] The fire alarm device 2 has an absorption measuring section A, wherein the absorption measuring section A extends from the light emitter device 3 or from the LED to the light detection device 4 or to the photodiode. In particular, the light path LW in a detection state, e.g., after initial installation, is aligned such that the light path LW and the absorption measuring section A lie on the same line or on the same path. For example, the length of the absorption measuring section A is more than 1 m, in particular more than 10 m, and most preferably more than 50 m. The absorption measuring section A extends without interruption from the light emitter device 3 to the light detection device 4.

[0031] The fire alarm device 2 is designed to detect a fire in corridors or rooms of building 1. The detection of fire gases is achieved by evaluating the light intensity L received by the light detection device 4. A decrease in light intensity occurs when the light radiation L is absorbed or scattered by fire gases along the absorption measurement path A. If only a defined proportion of the light radiation L emitted by the light emitter device 3 reaches the light detection device 4, it can be assumed that the emitted light radiation L has been scattered or absorbed by smoke particles or smoke gases. For example, a fire is detected when the measured light intensity falls below a predefined intensity level during absorption measurement.

[0032] The fire alarm device 2 has an adjustment device 5, wherein the adjustment device 5 is arranged, mounted, or supported on the wall 6 or another support structure. For example, the adjustment device 5 is designed as an actuator, e.g., an electric motor with a gearbox. Alternatively, the adjustment device 5 can also be designed as a stepper motor with a gearbox. Preferably, the adjustment device 5 is designed to change the position of a measuring light spot of the light radiation L in a plane formed by the light detection device 4, for example, by at least 0.5 m, and in particular by at least 1 m.

[0033] The adjustment device 5 is mechanically connected to the housing of the light emitter device 3. The adjustment device 5 is designed to allow adjustment of the light emitter device 3 relative to the wall 6 or other support structure in at least one spatial direction.

[0034] The fire alarm device 2 comprises an evaluation unit 7, wherein the evaluation unit 7 is preferably designed as a digital data processing unit, in particular as a microcontroller. The evaluation unit 7 is, for example, arranged in the housing of the light emitter device 3. A first position information sensor 8a is connected to the evaluation unit 7 via a signal. The first position information sensor 8a is operatively connected to the housing of the light emitter device 3. A second position information sensor 8b is connected to the evaluation unit 7 via a signal. The second position information sensor 8b is operatively connected to the housing of the light detection device 4. For example, the first and the second position information sensors 8a, b are inertial sensors and / or geomagnetic field sensors and / or satellite navigation data sensors.

[0035] The first and second position information sensors 8a, b are configured to acquire position information, with the first and second position information sensors 8a, b operating independently of each other. For example, the position information includes an absolute position and / or a relative position of the light emitter device 3 and / or the light detection device 4. The absolute position is defined, in particular, by a global reference system, especially preferably a world coordinate system, and / or any other reference system. The relative position preferably includes a change in orientation and / or a change in position. The first position information sensor 8a acquires the position information of the light emitter device 3 and transmits it to the evaluation unit 7. The second position information sensor 8b acquires the position information of the light detection device 4 and transmits it to the evaluation unit 7.The transmission of positional information can be carried out, for example, via digital data transmission or any other transmission method. Preferably, the positional information from the second positional information sensor 8b can be transmitted wirelessly, for example, via radio.

[0036] The evaluation unit 7 is designed to evaluate the position information from the light emitter unit 3 and the light detection unit 4. In a simplified representation, the position information can be seen as the input signal. Furthermore, the evaluation unit 7 is designed to convert the input signal into an output signal. The evaluation unit 7 is connected to the adjustment unit 5 via signal transmission to transmit the output signal.

[0037] In the Fig. Figure 2 depicts an operating situation where a force K acts on building 1, for example, due to temperature changes or wind. Building 1 experiences deformation due to the force K, although this deformation is greatly exaggerated here for illustrative purposes. This deformation of building 1, or its walls 6, causes a deviation of the position of the light emitter 3 and / or the light detection device 4 from their original position. This deviation can be, for example, a displacement and / or a rotation. Depending on the degree of deviation, the light radiation L or the light path LW may not reach the light detection device 4, or at least only partially. The absorption measurement path A generally runs from the light emitter 3 to the light detection device 4. Due to the deviation in the position of the light emitter 3 and / or the light detection device 4, for example,a new absorption measurement section, not shown in this embodiment, wherein the new absorption measurement section is, for example, a displacement of the original absorption measurement section.

[0038] The first and / or the second position information sensors 8a, b detect the deviation of the position of the light emitter device 3 or the light detection device 4 from the original position and transmit this, for example, as new position information to the evaluation unit 7. The evaluation unit detects the deviation of the position independently of the light intensity L of the light radiation measured by the light detection device 4.

[0039] The first and / or second position information sensors 8a, b transmit the position information to the evaluation unit 7 to check a deviation criterion. For example, a reference value of the position information for the first and the second position information sensors 8a, b is stored in the evaluation unit 7. If the deviation criterion is met, the evaluation unit 7 sends a signal, for example an output signal, to the adjustment unit 5 as a measure to fulfill the deviation criterion. Based on the output signal, the adjustment unit 5 adjusts the light path LW or the light emitter 3. The adjustment of the light path LW or the light emitter 3 is carried out until the light path LW or the light radiation L runs along the absorption measurement section A, in particular until the light path LW and the absorption measurement section again form a common line or a common section.Preferably, the tracking of the light path LW or the light emitter device 3 is performed automatically. Particularly preferably, the tracking occurs promptly, especially within 30 seconds of the deviation criterion being met.

[0040] The Fig. Figure 3 shows a second operating situation, after the light emitter device 3 has been aligned by the adjustment device 5. After the light path LW has been re-tracked by the adjustment device 5, the light path LW and the absorption measuring section again form a common path. After re-tracking, the light radiation L, or the light path LW, again strikes the light detection device 4 completely, and in particular centrally, so that the detection state is restored.

[0041] Fig. Figure 4 shows a further embodiment of the fire alarm device 2. In the illustrated embodiment, the light emitter 3 and the light detection device 4 are arranged directly adjacent to each other. For example, the light emitter 3 and the light detection device 4 are arranged in a common housing or mechanically connected to each other. The fire alarm device 2 has a reflector 9, which, for example, can be designed as a retroreflector. The absorption measuring path A runs from the light emitter 3 via the reflector 9 to the light detection device 4. Alternatively or optionally in addition to the adjustment device 5, the reflector 9 has a further adjustment device 15 and / or a further evaluation device 14.The additional adjustment device 15 and / or the additional evaluation device 14 are interconnected via signal transmission and are arranged, for example, in a common housing of the reflector device 9. The reflector device 9 includes the second position information sensor 8b, which is operatively connected to the reflector device 9 so that position information from the reflector device 9 can be acquired. The position information from the reflector device 9 can be transmitted, for example, to the additional evaluation device 7, 14 for verification of the deviation criterion.

[0042] Fig. Figure 5 shows a further alternative embodiment of the fire alarm device 2. In the illustrated embodiment, the reflector device 9 is arranged on or near the ceiling. Alternatively, the reflector device 9 can also be arranged on another wall or another supporting structure at the same height as the light emitter device 3 and / or the light detection device 4. The light emitter device 3 and the light detection device 4 are arranged separately from each other and opposite each other on the wall 6. For example, the light emitter device 3 and the light detection device 4 can also be arranged at different points in a room.

[0043] The absorption measurement section A runs from the light emitter 3 via the reflector 9 to the light detection unit 4. The absorption measurement section A is deflected at the reflector 9, forming a deflection section. Depending on the arrangement of the light emitter 3, the light detection unit 4, and the reflector 9, various angles can be achieved in the deflection section of the absorption measurement section A. Optionally, the reflector 9 can be equipped with a third position information sensor 8c. This third position information sensor 8c is operatively connected to the reflector 9, enabling the acquisition of position information for the reflector 9. Alternatively, or optionally, the reflector 9 can also include at least the additional adjustment device 15 and / or the additional evaluation device 14.The reflector device 9 can further influence the light path LW by means of the additional adjustment device 15 and / or the additional evaluation device 14.

[0044] In the Fig.Figure 6 shows a schematic representation of the evaluation unit 7. The first position information sensor 8a is connected to the evaluation unit 7. Optionally, the second and / or third position information sensor 8b, c and / or further position information sensors can be additionally connected to the evaluation unit 7 via signal transmission. The evaluation unit 7 has a control module 10 for checking a deviation criterion for the position information. For example, the control module 10 is configured to process information. The evaluation unit 7 includes a fault module 11 for generating a fault message. The fault module 11 is controlled by the control module 10 via signal transmission. Optionally, the fault module 11 can additionally transmit the fault message to a fire alarm control panel 13. The evaluation unit 7 has a control module 12 for controlling the adjustment device 5.Control module 12 is indirectly controlled by control module 10 via fault module 11. For example, the fault message sent by fault module 11 can be used as an input signal for control module 12. Optionally, control module 12 can be controlled directly by control module 10.

[0045] The control module 10 defines at least one reference value, in particular a limit value and / or target value, for the position information acquired by the first position information sensor 8a. Preferably, a first position information is defined as the reference value, which can, for example, be a target position. If, for example, the light emitter device 3 deviates in position, a second position information is generated, for example, an actual position. The control module 10 is configured to recognize a deviation of the first position information from the second position information as a deviation criterion, in particular if the second position information exceeds the defined reference value. The control module 10 compares, for example, the position information currently measured by the first position information sensor 8a with the defined reference value. If the deviation criterion is met, a measure is taken.

[0046] The fault module 11 is configured to generate the fault message as a measure for fulfilling the deviation criterion. The fault message serves as an input signal for the control module 12 and / or as an input signal for a fire alarm control panel 13. For example, the fault message is displayed as a fault message in the fire alarm control panel 13.

[0047] The control module 12 is configured to generate a control signal for the adjustment device 5 or 15 as a measure to fulfill the deviation criterion, so that the light path LW is changed and the light path LW is adjusted to follow the absorption measurement section A. The control module 12 receives an input signal either directly from the control module 10 or indirectly from the fault module 11. The control module 12 sends a signal, for example, the electrical signal, to the adjustment device 5 or 15. The adjustment device 5 adjusts the light path LW so that the light path LW again corresponds to the absorption measurement section A.

Claims

[1] Fire alarm device (2) for a building (1), with at least one light emitter device (3) for emitting light radiation (L) and at least one light detection device (4) for detecting the light radiation (L), with an absorption measurement section (A) that runs from the light emitter device (3) to the light detection device (4), wherein in a detection state of the fire alarm device (2) a light path (LW) of the light radiation (L) runs along the absorption measuring section (A), with an evaluation unit (7), the fire alarm device (2) has at least one position information sensor for detecting position information of the light emitter device (3) and / or the light detection device (4), wherein the evaluation device (7) is designed for evaluating the position information, characterized by , that the evaluation unit (7) includes a control module (10) for checking a deviation criterion for the situation information, wherein the evaluation unit (7) is designed to take action when the deviation criterion is met, the evaluation device (7) comprises a control module (12), wherein the control module (12) is controlled by the control module (10) and the control module (12) is configured to control a change in the light path (LW) as a measure when the deviation criterion is met, wherein the control module (12) is configured to control a change in the light path (LW) such that the light path (LW) runs along a new absorption measurement section (A) and is tracked, wherein a change in the position of the light emitter device (3) and / or the light detection device (4) results in the new absorption measurement section (A), which is shifted and differs from the original absorption measurement section (A). [2] Fire alarm device (2) according to claim 1, characterized by that the position information sensor system includes an inertial sensor and / or an Earth magnetic field sensor and / or a satellite navigation data sensor. [3] Fire alarm device (2) according to any of the preceding claims, characterized by , that the evaluation device (7) includes a fault module (11), wherein the fault module (11) is controlled by the control module (10) and wherein the fault module (11) is configured to generate a fault message as a measure when the deviation criterion is met. [4] Fire alarm device (2) according to any one of the preceding claims, characterized by , that the fire alarm device (2) comprises at least one adjustment device (5), wherein the control module (12) is designed to control the adjustment device (5), wherein the adjustment device (5) performs the change of the light path (LW). [5] Fire alarm device (2) according to claim 4, characterized by , that the adjusting device (5) is designed to adjust the light emitter device (3) and / or the light detection device (4). [6] Fire alarm device (2) according to claim 4 or 5, characterized by , that the fire alarm device (2) comprises a reflector device (9), wherein the absorption measuring section (A) extends from the light emitter device (3) via the reflector device (9) to the light detection device (4), wherein the and / or a further adjustment device (5) is designed for adjusting the reflector device (9). [7] Fire alarm device (2) according to claim 6, characterized by , that the fire alarm device (2) has at least one further position information sensor for recording the position information of the reflector device (9). [8] Fire alarm device (2) according to any one of the preceding claims, characterized by, that the light emitter device (3) and the light detection device (4) are arranged opposite each other. [9] Fire alarm device (2) according to any one of the preceding claims, characterized by , that the fire detection device (2) is designed as a linear detector. [10] Building (1) with a fire alarm device (2) according to one of the preceding claims.

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