EP1802919A1 - Lüftungsgerät - Google Patents
LüftungsgerätInfo
- Publication number
- EP1802919A1 EP1802919A1 EP05810199A EP05810199A EP1802919A1 EP 1802919 A1 EP1802919 A1 EP 1802919A1 EP 05810199 A EP05810199 A EP 05810199A EP 05810199 A EP05810199 A EP 05810199A EP 1802919 A1 EP1802919 A1 EP 1802919A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- receiving device
- ventilation
- laser beam
- ventilation device
- transmitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
Definitions
- the invention relates to a ventilation device, in particular a hood Dunstab ⁇ , according to the preamble of claim 1.
- EP 0 443 141 B1 describes an extractor hood with an ultrasonic transmitter and an ultrasound sensor system, in which the signal fluctuations recorded by the ultrasound sensor system are used to control a fan stage.
- a disadvantage here is seen that the ultrasonic sensor system is expensive and therefore the application of Only in extractor hoods of the upper price segment comes into question.
- the object of the invention is to provide a ventilation device of the type mentioned in the introduction with which the disadvantages of the prior art can be avoided and, in particular, a low-cost and reliable possibility for detecting a cooking process and the associated air contamination such as, for example Cooking treads or air movements over a cooktop is possible.
- the transmitting device is designed to emit a laser beam.
- the use of a laser beam is both economically and technically advantageous.
- By emitting nearly parallel laser light through a laser light transmitter it is possible to achieve an intensity clearly defined with respect to the cross-sectional area of the laser beam. This makes it possible to realize even longer measuring distances within the fan, without a reasonable Auswer ⁇ tion is made difficult due to a too wide expansion of the light cone.
- the laser beam emitted by the transmitting device encounters air contaminants such as cooking turf or fluctuating air-density gradients, it is refracted, diffracted, deflected and / or scattered. This leads to the fact that the power registered by the receiving device is opposite to the output power of the transmitting device changed.
- Air streaks are characterized by air movement and air areas of different densities.
- the good recognizability of air streaks and air movements in the ventilation device according to the invention is particularly advantageous because, compared to particle detection, operation of the ventilation device can be initiated or adjusted earlier. If only the occurrence of particles triggers the operation, there is a great risk that air pollution or cooking turf has already arisen and developed, so that they are no longer detected by the ventilation unit.
- a laser beam offers particular advantages, since the frequency of the laser beam is largely uniform, so that receiving devices can be used which are set up in particular for the specific laser frequency or a narrow frequency range. It is thereby achieved that ambient light, which usually occurs in a broad frequency spectrum, does not lead to misinterpretations by a control device or a control circuit.
- the use of a laser beam also allows long and multiple deflected measuring sections, which allows a particularly fine-meshed detection of air contamination. From an economic point of view, the use of a laser beam is very advantageous. Laser modules are nowadays mass products and therefore very reliable and are also available at low cost.
- the signal generated by the receiving device with respect to electrical characteristic values such as its frequency, its voltage or its current strength depends on the power or intensity of the received radiation.
- Corresponding sensors and receiving modules which generate corresponding electrical signals as a function of light irradiation are known today.
- a control device with a microcontroller for example, a receiving device can be used, whose output signal with respect to the voltage depends on the incident light.
- This signal is connected to an A / D converter input of the microcontroller and is thus to be processed by it. It may also be expedient to use a sensor whose frequency depends on the power of the received radiation, since no A / D converter is required for such a frequency measurement.
- the signal generated by the receiving device depends only on the incident radiation in a frequency range which largely corresponds to the frequency range of the laser beam.
- a frequency range which largely corresponds to the frequency range of the laser beam.
- interference by ambient light or, for example, an illumination integrated into an extractor hood is avoided.
- the restriction to such a frequency range for example by means of a filter which is arranged in front of a sensor in the receiving device or by means of special sensors, which are designed for an exclusive reception of light in the corresponding frequency range.
- the receiving device has a photoelectric sensor, which preferably has a photo sensor or a photodiode.
- a photoelectric sensor which preferably has a photo sensor or a photodiode.
- the receiving device is equipped with filter means which limit the angular range in which incident light is registered by the receiving device.
- filter means which limit the angular range in which incident light is registered by the receiving device.
- it is especially it is also expedient to provide the receiving device with an angle-reducing device which allows light to enter only in an narrow angular range, for example with a hollow channel aligned in the direction of the laser beam. The same is achieved by arranging the receiving device at the base of a bore provided for this purpose.
- the drive can be activated and deactivated by the control circuit or the control unit and can be controlled with respect to its power, preferably continuously.
- the control unit can be designed so that it completely automatically activates the drive for generating the air flow, as long as a corresponding need has been registered, and also adapts the required power accordingly.
- a stepless control of the power allows a particularly needs equitable operation.
- it is advantageous in controlling the power at various discrete stages that such control is simpler and less expensive.
- the control circuit or the control unit for evaluating the signal generated by the receiving device is designed with regard to air streaks or air movements with different density gradients in the measuring section.
- the controller is designed so that it interprets lower attenuation to the effect that a smaller amount of particles and / or air streaks are detected on the measuring section.
- the extent to which the damping is due to particles or air streaks can be deduced from other parameters such as the oscillation frequency.
- a trained control unit activates a ventilation device already at lower attenuation and thus allows a very convenient ventilation control especially in ei ⁇ nem period at the beginning or even before the air pollution.
- the ventilation device is adjustable with regard to its behavior in order to be operated in the right situation and to the right extent depending on varying environmental situations, for example use above hotplates or gas flames.
- the control circuit or the control device for controlling the drive is designed as a function of the intensity or registered power registered by the receiving device.
- the power is compared with the power or intensity delivered by the transmitting device or with a defined desired power or nominal intensity, wherein a reduction as an indication of absorption, refraction and / or diffraction as a consequence of Kochwrasen or air streaks or air movement is interpreted.
- the controller can be designed so that a reduced registered power is interpreted as an increased degree of contamination of the air, for example by cooking strokes, and as a consequence the power of the drive is increased.
- the control circuit or the control device for controlling the drive is formed as a function of the intensity or power registered by the receiving device over time.
- the use of the first derivative of the power after the time is superior to a pure control of ventilation an ⁇ hand the registered power. Rapid changes in power are due to turbulence in general or cooking in the area of the measuring section and are a sign of a high concentration of air contaminants such as cooking torrents or air movements.
- a control of the drive depending on the changes tion of the registered intensity or the registered performance can also be combined with an evaluation of the intensity or the performance itself. Thus both the frequency and the amplitude of the power curve over time are used to analyze the impurities on the measuring path.
- the transmitting device is designed for transmitting a laser beam whose luminous point has regions of greatly varying intensity in the region of the receiving device, preferably in the form of an interference pattern.
- maxima and minima can alternate, in particular generated by interference.
- Such a luminous spot can be registered by the receiving device not only with regard to whether the luminous spot strikes the receiving device or the sensor.
- a shift of the luminous spot on the photodiode also leads to a characteristic characteristic of air streaks and particles in the measuring section, without the luminous point having to be deflected far enough for it to leave the photodiode.
- the particularly advantageous evaluation Interference patterns can be achieved by using a laser with a comparatively wide frequency spectrum. Although it may be desirable for other aspects of the invention to use a laser with a particularly narrow frequency spectrum, depending on the requirements, it may therefore also be advantageous to use, for example, a multimode laser diode with a broad frequency spectrum.
- the transmitting device and the receiving device are designed such that the receiving device always lies within the luminous point during operation.
- the luminous point descending from the receiving device or the photodiode does not affect the output signal of the receiving device, but rather the movement of the luminous dot via the receiving device.
- the maxima and the minima of the interference image of the luminous point move over the sensor.
- the size of the sensor should be chosen so that it is smaller than the extension of the maxima and minima, whereby these can also be influenced by optical aids such as lenses.
- the advantage lies in particular in the fact that an exact calibration of receiving device and transmitting device can be omitted and the susceptibility to failure of such a ventilation device is very low.
- the registration of the movement of the luminous spot via the receiving device can take place, for example, by evaluating a moving interference pattern with maxima and minima.
- This can be advantageously used for controlling the extractor hood with a corresponding control method which carries out an evaluation of the output values of the sensor in the case of an interference pattern moving over it.
- the transmitting device and the receiving device are designed such that the durometer of the illuminating device point is a few mm wider than the receiving device, preferably at least 5 to 8 mm wider. As a result, a particularly low susceptibility is achieved. In the field of ventilation devices, large manufacturing tolerances are often used. Due to the fact that the mode of operation of the transmitting and receiving device according to this development does not depend on the transmitting and receiving device being at their desired position to the nearest millimeter, more favorable production methods can be used and no additional measures are required In order to ensure the correct and highly accurate alignment of these Einrich ⁇ lines.
- the control circuit or the control unit evaluates the output signal with regard to signal frequency and signal attenuation. This is particularly useful when using a laser beam which is so pronounced that it always rests on the receiving element in normal operation, and which has a luminous point with regions of greatly varying intensity.
- the registered intensity or the determined Dämp ⁇ tion of the laser beam as an indicator of the presence of steam and the frequency can be regarded as an indicator of the presence of heat.
- a strong damping can be seen as a sign of intensive cooking operation and a high signal frequency as a sign of intensive frying operation.
- the transmitting device and the receiving device are arranged opposite each other on both sides of the air flow in the ventilation device and the transmitting device radiates in the direction of the receiving device.
- the transmitting device and the receiving device are preferably located on opposite sides. lying side of the air flow, in particular centrally above the cooktop, so that the measuring section thwarts the air flow.
- Such an arrangement with direct alignment of transmitting and receiving device to each other is simple and less prone to interference.
- the transmitting device and the receiving device are arranged so that a laser beam emitted by the transmitting device passes from the at least one reflecting device to the receiving device.
- a reflection device permits the arrangement of the transmitting and receiving device in the immediate vicinity of one another by arranging the transmitting and receiving device on one side of the fan. On the opposite side of the reflection device is arranged. In this way it is also possible to design the transmitting and receiving device as a module, as a result of which the assembly and adjustment effort is significantly reduced compared with the use of two separate modules.
- At least two reflection devices are provided, which are arranged and aligned such that a laser beam emanating from the transmitting device from at least one reflection device reaches the receiving device at least twice.
- the two reflection devices face each other and are arranged parallel to one another.
- the Reflekti ⁇ ons sexualen may be arranged on the front and rear or on the left and right inner side of the ventilation unit or the Dunstab ⁇ zugshaube.
- aus ⁇ directional transmitting and receiving devices By appropriately arranged and aus ⁇ directional transmitting and receiving devices, it is possible to let the laser beam reflect so many times from one side to the other and thus almost the entire cross section of the ventilation device subsequent evaluation by the control unit or the Steuer ⁇ circuit basis lay.
- the transmitting device has a laser diode for emitting the laser beam, in particular a multi-mode laser diode.
- Multimode laser diodes emit light of different frequencies and, for technical reasons, are well suited for the proposed ventilation devices.
- the radiation beam emitted by them has an increased di- vergence and increased diffraction tendency due to increased wavelength spread compared with singlemode laser diodes.
- due to their frequency spectrum they generate an interference pattern in the luminous spot, which, as described above, enables a particularly good evaluation with maxima and minima with low susceptibility to interference.
- the increased divergence and the interference pattern are particularly advantageous in the detection of air streaks.
- the transmitting device has a collimator lens.
- This collimator lens allows the adaptation of the position of their focal point a convenient optimization of the transmitting device.
- the widening of the laser beam in the region of the receiving device can be varied via the position of the collimator lens and / or the focal point of the collimating lens.
- the laser beam can also be made somewhat di ⁇ vergent.
- An enlarged widening increases the sensitivity of the receiving device, in particular with regard to air movements, so that the control unit is provided with a signal that can be interpreted more easily.
- the controller accordingly controls the fan very needs, especially even before steam.
- an expansion of the laser beam also leads to a smaller light output received by the receiving device.
- the collimator lens By adapting the collimator lens with regard to location and type, it is possible to produce an optimum light transparency and air schlieren and cooking surface detection of the laser beam.
- a finished laser module can be dispensed with and a cost-effective design consisting of laser diode and lens can be provided.
- the divergence of the laser beam from the control unit or the control circuit is adjustable. Since the attenuation of laser beams of lesser divergence by air streaks is less than the attenuation of laser beams of high divergence, it can be achieved by adjustability of the divergence that distinguishes particularly reliably between attenuations due to vapors or particles on the one hand and air streaks or air movements on the other hand can.
- the control unit of such a ventilation device can therefore, for example, alternately measure the damping at high and low Diver ⁇ genz and set in the case of low attenuation, which is due only to air streaks, the fan in operation.
- the adjustability is preferably achieved via an adjustable lens.
- At least two transmitting devices are provided for the output of laser beams of different divergence.
- two transmitting devices can be achieved with different Divergenz ⁇ setting that the cause of attenuation on the measuring section is reliably detected.
- the adjustability and the resulting increased complexity of the transmitting device can be avoided thereby.
- both transmitting devices are directed to only one receiving device, which measures the incoming power of the laser beams either at the same time or alternately.
- FIGS. 1 and 2 partially cutaway views of a first embodiment of the extractor hood according to the invention; be, in which transmitting and receiving device are arranged on opposite inner sides of the extractor hood and in which a laser beam is submit directly bring ⁇ in the direction of the receiving device rank,
- FIG. 3 shows a detailed view of the receiving device of FIG.
- Figures 1 and 2 shown extractor hood
- FIG. 4 shows a partially sectioned view of a second embodiment of a hood according to the invention, in which the transmitting and receiving devices are arranged as a unitary module on an inner side of the extractor hood and in which a reflection device is provided on the opposite side of the extractor hood,
- FIG. 5 shows a partially sectioned view of a third embodiment of a hood according to the invention, in which the transmitting device and the receiving device are likewise arranged on the same inner side of the extractor hood, these being separate and spaced-apart modules, FIG.
- FIG. 6 shows a partially sectioned view of a fourth embodiment of a vapor extraction hood according to the invention, in which two parallel reflection devices are provided on opposite inner sides of the vapor extraction hood,
- FIG. 7 a schematic representation of a control device for a ventilation device according to the invention and components connected to this control device
- FIG. 9 a representation of the functional units of the control and evaluation
- FIG. 10 shows a diagram of measured values of the temporal behavior of the intensity of the received signal
- Figures 11 and 12 are schematic representations of moving individual points of light from the interference pattern of the laser via the receiving device and
- FIG. 13 shows a division between attenuation and frequency of the oscillation of the signal at the receiving device according to FIG. 10.
- Figures 1 and 2 show in each case in a partially sectioned manner a first embodiment of a ventilation device according to the invention in the form of an extractor hood 10.
- the hood 10 is devis ⁇ half of a cooktop 12 with four burners 14 arranged.
- the fume hood 10 extends almost over the entire width of the cooking trough 12 and covers about three quarters of its depth.
- the extractor hood 10 itself consists of a box-shaped lower part 16 and an upper part 18 open on the underside, the lower part 16 and the upper part 18 being connected to one another in such a way that cooking hobs starting from the cooktop 12, such as water vapor and cooking oil reach haze in the lower part 16 of the hood 10 and be forwarded from there into the upper part 18.
- a filter mat 19 and a fan 20 are arranged, which sucks the kitchen vapors through the filter mat 19 into the upper part 18.
- a transmitting device 22 with a laser and a receiving device 24 are arranged on the right or left inner side.
- the transmitting device 22 is aligned in such a way that a laser beam 25 emanating from it is directed directly onto the receiving device 24. If cooking hobs rise from the cooking zones 14 of the cooking trough 12 during cooking operation, they reach the lower part 16 of the draft hood 10.
- the laser beam 25, which is permanently or periodically activated, is partially absorbed by these cooking turfs and partly diffracted and broken. This results in a reduced input power at the receiving device 24 compared with the output power.
- a signal generated by the receiving device 24 is fed to a control unit, which is based on the power difference between the output power of the transmitting device 22 and the input power of the receiving device 24 as well as on the time variation
- This difference in performance allows conclusions about the degree of air movements and the presence and the amount of cooking turfs.
- this control unit controls the power supplied to the fan 20, the power being increased when the air movement is intense or the amount of cooking turf is high. If the input power at the receiving device 24 has returned to the output power of the transmitting device 22 in the course of air cleaning and is no longer subject to large fluctuations, the fan 20 can be throttled back or completely deactivated by the control device.
- FIG. 3 shows the receiving device of the extractor hood shown in Figures 1 and 2 in an enlarged view.
- the receiving device has a tubular portion 29a whose major axis coincides with the axis of incidence of the laser beam 25.
- a photo ⁇ electrical sensor 26 is arranged, which generates a corresponding signal as a function of the incident power.
- a filter 29b is arranged, which serves to filter the incident light and allows light to pass only in a certain frequency range tuned to the laser beam 25. If light of another frequency range is incident, it is absorbed by the filter 29b and therefore does not reach the photoelectric sensor.
- the tubular section 29a and the filter 29b it is achieved that the signal emitted by the photoelectric sensor 26 is determined exclusively or almost exclusively by the incident power of the laser beam and not by the ambient light.
- FIG. 4 shows a second embodiment of an extractor hood according to the invention.
- the transmitting and receiving devices are accommodated in a common functional module 29, which is arranged on an inner side of the lower part 16 of the extractor hood 10.
- a reflection device 30 is arranged on the gegenü ⁇ overlying inner side of the lower part 16.
- This reflection device can be, for example, a mirror or even a cat's eye.
- the laser beam 31, which is emitted by the functional module 29, is aligned in the direction of the reflection device 30. From this it is reflected in such a way that it deviates only slightly from its course before the reflection back to the Function module 29 passes.
- the integrated in this functional module 29 receiving device registers the returned power and are in the same manner as in the first embodiment, a dependent signal to an unillustrated control unit from.
- the advantage of this embodiment is that only one module has to be connected to the control unit. This saves costs for cabling and avoids structural difficulties.
- the measuring path compared with the embodiment shown in FIGS. 1 and 2 is approximately twice as long, which leads to more reliable results.
- FIG. 5 shows a third embodiment of an extractor hood according to the invention.
- this embodiment differs in that the transmitting device 32 and the receiving device 34 are arranged as separate modules, but on the same inner side of the lower part 16 of the extractor hood 10.
- a reflection device 36 is provided on the opposite inner side, whereby it is arranged and aligned such that a laser beam 38 emanating from the transmission device 32 strikes the receiving device 34 after the reflection.
- the illustrated embodiment has the disadvantage that the transmitting and receiving device must be ge separately connected to a control unit, not shown.
- the fact that the laser beam 38 does not run nearly parallel before and after the reflection by the reflection device 36 is advantageous. As a result, the area which the laser beam passes through is enlarged. As a result, it is more likely to reliably detect cooking turf from all hotplates and to make the control of the fan 20 well adjusted accordingly.
- FIG. 6 shows a fourth embodiment of an extractor hood according to the invention.
- This has a transmitter -40 and a receiving device 42, which in turn are arranged on the same inner side of the upper part 16 of the extractor hood 10.
- this embodiment differs in that a reflection device 44, 46 is arranged both on the inside of the transmitting and receiving devices 40, 42 and on the opposite side.
- the two reflection devices are aligned parallel to one another.
- the transmitting device 40 is aligned such that a laser beam 48 emanating from it is repeatedly reflected by the reflecting devices 44, 46 before it reaches the receiving device 42. This leads to a relatively long measuring path, which allows particularly precise conclusions about the presence of cooking turf and the like.
- FIG. 7 shows a control unit of a draft hood according to the invention and components connected thereto.
- the control unit has a control circuit 50 which has various connections.
- a transmitting device 52 is connected to a PWM output 54 (pulse width modulation output) of the control circuit 50 ange ⁇ .
- PWM output 54 pulse width modulation output
- the control circuit to specifically control the power of the transmitting device 52 and in particular of the laser integrated into the transmitting device 52.
- a receiving device 58 Connected to an A / D converter input 56 is a receiving device 58 which has at least one photoelectric sensor which varies the voltage supplied to the control circuit 50 as a function of the amount of incident light. Based on the measured values of the receiving device 58 thus received, it is detected in the control circuit 50 by means of a circuit or program provided for this purpose whether cooking torrents on the measuring path between the transmitting device 52 and the receiving device 58 are present and what density or which They have a degree of turbulence. Depending on the result of this analysis, a Ventilormo ⁇ tor 60 is driven, the power of the control circuit 50 can be influenced. If the amount of cooking turf is high, the fan motor 60 is driven in such a way that it sucks off the cooking turf with high power.
- FIGS. 8a and 8b show the beam path of a laser beam 62 of a ventilation device according to the invention in the region of a measuring path between a transmitting device 64 and a receiving device 66.
- the transmitting device 64 has a laser module 68 and a collimator lens 70 which emit the laser beam 62 emanating from the laser module 68 something expands.
- the laser beam 62 passes through the measuring path and impinges on the photoelectric sensor 72 in the receiving device.
- the photoelectric sensor 72 is configured with respect to its surface and the laser beam 62 adjusted so that the laser beam 62 is in an unbroken and undeflected state is completely detected by the photoelectric sensor 72 and its surface is largely completely irradiated.
- the photoelectric sensor 72 generates an output signal for a control unit of the ventilation unit as a function of the registered power.
- This signal can pass on the information about the registered power in various ways, for example by a correspondingly adapted voltage, by a suitable frequency or by other electrical characteristics.
- FIG. 8a shows the unbroken and undeflected state of the laser beam 62. In this state, the maximum power is registered by the photoelectric sensor 72 and a corresponding signal is forwarded to the control device (not shown). If such a signal is constantly transmitted to the control unit, it is interpreted by the control unit to mean that there are no cooking torrents and water vapors on the measuring path and that no activation of a fan of the ventilation unit is required.
- FIG. 8b shows a second state of the same measuring section.
- water vapor 74 is on the measuring section.
- the laser beam 62 emanating from the transmitting device 64 is refracted by the various water vapor concentrations and therefore deflects, and thus only partially, onto the photoelectric sensor 72.
- a portion 62a does not strike the photoelectric sensor 72, so that the power registered by the photoelectric sensor 72 is only that of a remaining portion 62b.
- An electrical parameter which gives information about the size of this component is forwarded to the control unit in the form of a corresponding signal. This can accordingly cause the extraction of the water vapor by means of an activation or a nursesteue ⁇ tion of the fan.
- reference numeral 74 may also designate air streaks, which are partially visible to the naked eye.
- FIGS. 8a and 8b show the pure deflection of the laser beam 62 and the consequent change in the registered power.
- the fan control can be carried out in such a way that this component is used directly as a criterion for registering air movements or air contaminants such as cooking turf and assuming a direct relationship between registered power and air movements or air contamination.
- lators can additionally or exclusively also be based on the dynamic change of the registered power.
- a der ⁇ like control is evaluated by the control unit, for example, with which frequency and / or which amplitude changes the registered Leis ⁇ device.
- the frequency of the power is particularly high with a large amount of cooking turf, so that a control of the Ventila ⁇ sector in response to the frequency leads to very good results.
- FIGS. 9 and 9 An alternative method to the evaluation system illustrated in FIGS. 8a and 8b is shown in FIGS. 9 and 9 with the schematic structure and FIGS. 11 and 12.
- FIG. 9 shows, based on FIGS. 1 and 4 and FIG. 7, a transmitter 122 with a laser diode or a laser module.
- a collimator lens 123 is seated, from which the correspondingly expanded and parallel laser beam 125 exits. It is reflected on the reflector 130, which may also be a so-called cat's eye. Under certain circumstances, this can also be done several times, as previously stated.
- the reflected laser beam 15 passes through a Fresnel lens 127 onto the receiver 124 or its sensor 92.
- the electrical signal detected by the sensor 92 is applied to the A / D converter input and thus to the control circuit 150.
- This control circuit 150 may be a microcontroller and control the motor or the power electronics 160 in addition to the control of the transmitter 122 via the PWM output 154.
- the intelligence is seated in the control circuit in order to control the extractor hood on the basis of the processes described above and above all. This should take place automatically, in particular depending on the condition on the cooktop 12, and thus manage without the intervention of an operator and also perform the pull-off function as efficiently and well as possible.
- the diameter of the laser luminous dots 90 which is generated by the interference pattern and the Fresnel lens according to FIG. 9 in front of the receiver, is substantially larger than the photoelectric sensor 92.
- FIGS and FIG. 12 show only a small section of the luminous dot 90. This is generated by a laser diode with a comparatively wide frequency spectrum, which leads to an interference pattern with maxima 94 and minima 96.
- This interference pattern is shown here as being relatively irregular, which is usually the case in practice because of the non-optimal design of the Fresnel lens and of the other optical path. Irrespective of the actual size of the maxima 94, it is important to have the concrete distance from one another, ie the size of the minima 96.
- the maxima 94 and minima 96 relative to the photoelectric sensor are sufficient 92 to significantly change the intensity measured by the sensor. Since the maxima 94, so to speak, dance over the sensor 92, ie their travel path is much larger than their diameter and that of the sensor anyway, the sensor 92 detects less a time-averaged average intensity. Rather, the sensor 92 detects the multiple over-travel of the various maxima as short peaks. Since the speed of the luminous point 90 and thus of the maxima 94 is relatively large and these cover the sensor substantially completely or not when moving, the peaks are easy to distinguish or to recognize.
- each maximum 94 has space around it or the minima 96 are in between, it is also ensured that after each passing of a maximum 94 via the sensor 92, this light is not registered in the minimum. So a good distinction is achieved. It is thus important in this case in general that the maxima 94 are approximately as large with respect to their area like the sensor 92, advantageously two to four times as large. This ratio can be influenced via the maxima 94 or the sensor. The luminous point 90 in turn is many times larger. He should always cover the sensor 92.
- FIG. 10 shows, over time, how the individual peaks as individual deflections in the overall course represent a type of noise. However, it is still easy to recognize or optically evaluate via the sensor 92 and electronically via the controller. It should be noted that in Figure 10, the attenuation a over time t or over the time course of the cooking process is shown. The actual intensity of the measured maxima 94 on the sensor 92 is, so to speak, the reciprocal of the attenuation. The change in the frequency of oscillating or moving the maxima is difficult to recognize from this, only in connection with FIG. 13.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Ventilation (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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PL05810199T PL1802919T3 (pl) | 2004-10-20 | 2005-10-20 | Urządzenie wentylacyjne |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE102004052201 | 2004-10-20 | ||
DE102005015754A DE102005015754A1 (de) | 2004-10-20 | 2005-03-30 | Lüftungsgerät |
PCT/EP2005/011296 WO2006042758A1 (de) | 2004-10-20 | 2005-10-20 | Lüftungsgerät |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1802919A1 true EP1802919A1 (de) | 2007-07-04 |
EP1802919B1 EP1802919B1 (de) | 2013-03-20 |
Family
ID=35637121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05810199A Not-in-force EP1802919B1 (de) | 2004-10-20 | 2005-10-20 | Lüftungsgerät |
Country Status (6)
Country | Link |
---|---|
US (1) | US7442119B2 (de) |
EP (1) | EP1802919B1 (de) |
DE (1) | DE102005015754A1 (de) |
ES (1) | ES2408255T3 (de) |
PL (1) | PL1802919T3 (de) |
WO (1) | WO2006042758A1 (de) |
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US20110005507A9 (en) * | 2001-01-23 | 2011-01-13 | Rick Bagwell | Real-time control of exhaust flow |
ATE473062T1 (de) | 2004-07-23 | 2010-07-15 | Halton Group Ltd Oy | Verbesserungen zur steuerung von abgassystemen |
US20080274683A1 (en) | 2007-05-04 | 2008-11-06 | Current Energy Controls, Lp | Autonomous Ventilation System |
US20090048714A1 (en) * | 2007-08-17 | 2009-02-19 | Maxitrol Company | Control system and method for controlling an air handling fan for a vent hood |
US20090061752A1 (en) | 2007-08-28 | 2009-03-05 | Current Energy Controls, Lp | Autonomous Ventilation System |
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2005
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- 2005-10-20 PL PL05810199T patent/PL1802919T3/pl unknown
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- 2005-10-20 WO PCT/EP2005/011296 patent/WO2006042758A1/de active Application Filing
- 2005-10-20 EP EP05810199A patent/EP1802919B1/de not_active Not-in-force
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2007
- 2007-04-18 US US11/736,978 patent/US7442119B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
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See references of WO2006042758A1 * |
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PL1802919T3 (pl) | 2013-08-30 |
EP1802919B1 (de) | 2013-03-20 |
US20070184771A1 (en) | 2007-08-09 |
US7442119B2 (en) | 2008-10-28 |
WO2006042758A1 (de) | 2006-04-27 |
DE102005015754A1 (de) | 2006-04-27 |
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