DE102016203015A1 - Device, mobile terminal and method for detecting particles in a fluid - Google Patents

Abstract

The invention provides a method and apparatus for detecting particles in a fluid. The device is formed with: a measuring chamber (12); a supply device (14) which is designed to provide a light beam (51) such that the provided light beam (51) enters the measuring chamber (12); a detection device (16) which is designed to detect light beams (52) scattered on the particles (2) in the measuring chamber (12) and to generate a detection signal based thereon; and a fluid guiding device (18), by means of which the fluid (1) can be introduced into the device (10) by a movement of the device (10) and can be conducted through the measuring chamber (12).

Description

The present invention relates to a device, a mobile terminal and a method, each for detecting particles in a fluid, in particular of particles in a fluid surrounding the device or the mobile terminal. The fluid may in particular be a gas, more preferably air.

State of the art

The determination of a particle concentration, in particular a fine particle concentration in the air is a task of ever increasing importance. Many large cities have large units of equipment that determine air quality in general and particle concentration in particular. The measured particle concentration may in particular be particulate matter with the PM value 2.5. There is a need for a convenient and reliable meter for determining air quality, especially if, for example, no official measurements with sufficient reliability are available.

A known technique for detecting particles is based on illuminating the fluid with the particles to be detected by means of a light beam and detecting the scattered light on the dust particles by means of a photodiode. Conventionally, ambient air is actively passed through the detecting light beam. The passage of the ambient air through the light beam is usually carried out by generating an air flow by means of a fan.

In the US 8 009 290 B2 a particle sensor is described, which comprises a means for generating an air flow.

Disclosure of the invention

The present invention discloses a device, a mobile and a method having the features of the independent claims.

Accordingly, there is provided an apparatus for detecting particles in a fluid, comprising: a measuring chamber; a delivery device configured to provide a light beam such that the provided light beam enters the measurement chamber; a detection device which is designed to detect the light beams scattered on the particles in the measuring chamber, in particular reflected, and to generate a detection signal based thereon; and a fluid guiding device, by means of which the fluid can be introduced into the device by a movement of the device and can be conducted through the measuring chamber. Preferably, after passing through the measuring chamber, the fluid can also be diverted out of the device by the fluid guiding device.

A movement of the device is to be understood in particular as a movement of the device as a whole, for example pivoting of a mobile terminal in which the device is installed. In particular, the fluid guiding device can be designed such that, by manually moving, for example pivoting, the device according to the invention, the fluid surrounding the device enters the device and is guided through the measuring chamber.

The invention further provides a mobile terminal with a built-in or integrated device according to the invention. The mobile terminal may in particular be a tablet or a smartphone.

Furthermore, the invention provides a method for detecting particles in a fluid, comprising the steps of: providing a light beam such that the provided light beam enters a measuring chamber; Moving the measuring chamber relative to the fluid to direct the fluid through the measuring chamber; Detecting, in particular reflected, light rays scattered on the particles in the passed-through fluid in the measuring chamber; Generating a detection signal based on the detected scattered light beams; and detecting the particles based on the generated detection signal.

Detecting the particles means in particular determining at least one property of the particles, wherein the at least one property is for example a number and / or concentration of the particles in the fluid, a size of the particles and / or a presence of the particles in the fluid can.

Advantages of the invention

The device according to the invention can advantageously be embodied without an active fluid movement device, for example a fan, and is particularly preferably designed without any moving parts. As a result, the device according to the invention is particularly easy to miniaturize and very durable. Due to its small minimum size, the device according to the invention can advantageously be integrated into a smartphone or a device that can be used by a human, in particular without much effort, and thus be particularly versatile. Furthermore, the device according to the invention has a particularly low power requirement.

Advantageous embodiments and further developments emerge from the dependent claims and from the description with reference to the figures.

According to a further preferred development, the device comprises a computing device which is designed to detect the particles based on the generated detection signal and to generate an output signal based thereon. Thus, an external computing device may be unnecessary.

According to a preferred development, the device according to the invention comprises a sensor device which is designed to detect a movement parameter of a movement of the device and to generate a sensor signal based thereon. The movement may in particular be a movement by means of which the fluid is passed through the measuring chamber. The computing device can be designed to additionally detect the particles as a function of the sensor signal. By means of the movement parameters, for example a movement speed and / or a direction of movement, a fluid flow of the fluid through the measuring chamber can be determined particularly precisely, as a result of which the particles can be detected even more precisely.

According to a further preferred refinement, the computing device is designed to determine a flow velocity of the particles through the measuring chamber based on at least one temporal light intensity function of at least one scattered light beam and to additionally detect the particles as a function of the determined flow velocity. In particular, the computing device may be configured to calculate a concentration of the particles in the fluid based on the determined flow rate and a number of reflection events based on the detection signal per unit time.

The computing device may also be designed to determine, based on the sensor signal and the determined flow rate, a proportion of wind and a proportion of the flow rate of the fluid through the measuring chamber that is based on the movement of the device and to detect the particles based thereon. As a result, the particles can be detected even more accurately.

According to a further preferred embodiment, the device according to the invention comprises an indication device, which is designed to generate a notification signal in dependence on at least the sensor signal and to provide the indication signal to a user of the device; wherein the indication signal indicates how the device is to be moved by the user to introduce the fluid into the device and to pass it through the measuring chamber.

According to a further preferred refinement, the fluid guiding device has at least one deflecting unit which is designed to divert the fluid before it enters the measuring chamber and / or after it leaves the measuring chamber. As a result, for example, ambient light can be kept away from the detection device. Optionally, by means of the at least one deflecting unit, an inlet and / or outlet opening of the fluid device can also be arranged at a particularly favorable location on an outside of the device according to the invention or of the mobile terminal according to the invention.

According to a further preferred development, the fluid guiding device is formed symmetrically with respect to the measuring chamber in a region around the measuring chamber, in particular mirror-symmetrically with respect to a plane which traverses the measuring chamber and / or is point-symmetrical, in particular with respect to a point which lies in the measuring chamber. In this way, it can be achieved, for example, that the fluid can be transmitted through the measuring chamber in both directions when the device, in particular the measuring chamber, of the device is pivoted back and forth. As a result, the number of measurements per unit of time can be increased, for example doubled.

According to a further preferred development of the mobile terminal according to the invention, a first opening of the fluid guiding device of the device according to the invention of the mobile terminal is formed on a first outer side of the mobile terminal and a second opening of the fluid guiding device of the inventive device of the mobile terminal according to the invention on a second outer side of the mobile terminal formed, wherein the first outer side is different from the second outer side. In this way, it can be achieved that a user can bring in the fluid with the particles to be detected into the measuring chamber of the device according to the invention of the mobile terminal according to the invention particularly simply by moving, for example pivoting, the mobile terminal. In particular, it can be accomplished that the user of the mobile terminal does not have to perform any special movement for detecting the particles, but that this is already done by a large part of the usual movements in a conventional use of the mobile terminal itself.

According to a preferred development, the method according to the invention comprises the step: detecting a movement parameter of the movement of the measuring chamber relative to the fluid. The detection of the particles can additionally take place on the basis of the detected motion parameter.

According to a further preferred refinement, an acceleration sensor of a mobile terminal is used for detecting the movement parameter. Thus, the method can be improved without additional hardware requirements.

Brief description of the drawings

The present invention will be explained in more detail with reference to the embodiments illustrated in the schematic figures of the drawings. Show it:

1 a schematic block diagram of an apparatus for detecting particles in a fluid according to an embodiment of the present invention;

2 a schematic block diagram of an apparatus for detecting particles in a fluid according to another embodiment of the present invention;

3 a graph showing a light intensity of the detected scattered light rays as a function of time;

4 a schematic cross-sectional view of an apparatus for detecting particles in a fluid according to yet another embodiment of the present invention;

5 a schematic cross-sectional view of an apparatus for detecting particles in a fluid according to yet another embodiment of the present invention;

6 a schematic cross-sectional view of an apparatus for detecting particles in a fluid according to yet another embodiment of the present invention;

7 a schematic plan view of a mobile terminal according to yet another embodiment of the present invention;

8th a schematic plan view of a mobile terminal according to yet another embodiment of the present invention; and

9 a schematic flowchart for explaining a method for detecting particles in a fluid according to yet another embodiment of the present invention.

In all figures, the same or functionally identical elements and devices - unless otherwise stated - provided with the same reference numerals. The numbering of method steps is for the sake of clarity and, in particular, should not, unless otherwise specified, imply a specific chronological order. In particular, several method steps can be carried out simultaneously.

Description of the embodiments

1 shows a schematic block diagram of a device 10 for detecting particles 2 in a fluid 1 ,

The device 10 comprises a fluid guiding device 18 , by means of which a device 10 - at least partially - surrounding fluid 1 , For example, air, by a movement of the device 10 into the device 10 einbringbar and, by a further or the same movement of the device 10 through a measuring chamber 12 the device 10 is passed through, preferably again from the device 10 out. Advantageously, the device 10 no active air conveyor, such as a pump, a fan, a fan, etc., and more preferably has no moving parts.

The device 10 further comprises a provisioning device 14 , which is designed to be a light beam 51 such that the light beam provided 51 into the measuring chamber 12 enters and in particular by means of the fluid guide device 18 through the measuring chamber 12 passed through fluid 1 crosses. The light beam 51 is made by particles 2 in the fluid 1 within the measuring chamber 12 partially scattered, in particular reflected, whereby scattered, in particular reflected, light rays 52 arise. The device 10 comprises a detection device 16 , which in particular in the measuring chamber 12 , For example, on an inner wall of the measuring chamber 12 , is arranged. The detection device 16 is designed to be the scattered light rays 52 and based on the detected scattered light rays 52 a detection signal 71 to create.

The detection device 16 may comprise an amplifier which receives the detection signal 71 as a gain of the detection device 16 based on the detected scattered light rays 52 initially generated raw signal outputs. The detection signal 71 is by an external, and / or an optional internal, computing device accessible and for detecting the particles 2 evaluable.

The light beam 51 is through the provisioning device 14 preferably parallel to the detection device 16 or focused over the detection device 16 provided. For example, the light beam provided 51 at a distance of 1 millimeter or less above the detector 16 run. An angle between a propagation direction of the provided light beam 51 and a - when expected use expected - direction of movement of the fluid 1 through the measuring chamber 12 may for example be 90 °, with other arrangements are possible. A photodetection surface, such as a photodiode, of the detection device 16 may be arranged parallel to a virtual plane, which by the propagation direction 16 of the light beam 51 and the direction of movement of the fluid 1 is formed.

The light beam 51 is preferably provided with a beam diameter which is greater than a mean aerodynamic diameter of the particles to be detected 2 , The light beam is preferred 51 provided with a beam diameter which is larger than the average aerodynamic diameter of the particles by more than one order of magnitude, ie more than ten times 2 , This simplifies, for example, a measurement of the flow velocity of the particles, as described below with reference to FIG 3 explained in more detail.

The fluid guiding device 18 is advantageously designed such that the smallest possible, preferably a vanishing, proportion of the fluid 1 the light beam 51 in the measuring chamber 12 misses or bypasses.

2 shows a schematic block diagram of a device 110 for detecting particles 2 in a fluid 1 according to another embodiment of the present invention. The device 110 is a variant of the device 10 and differs from this in particular in an optional computing device 120 the device 110 as well as in other optional elements. The computing device 120 is designed based on at least the detection signal 71 the particles 2 to detect and based thereon an output signal 75 issue. Unless otherwise described, the device is 110 formed as in relation to the device 10 may also function and is according to corresponding modifications and variations of the device 10 modifiable. The computing device 120 may be a processor of a mobile terminal, as part of which the device 110 is trained.

Alternatively, the device 110 even without the computing device 120 be designed and designed for connection to an external computing device, which performs the same functions as in relation to the computing device 120 are described. This variant is not always explicitly mentioned in the following, but should always be read.

The device 110 has a light sink 124 which is arranged such that the light beam provided 51 after an unscattered crossing of the measuring chamber 12 on the light sink 124 impinges and is absorbed by this as completely as possible. Thus, unwanted scattering or reflections of the provided light beam 51 for example, on an inner wall of the measuring chamber 12 be reduced or prevented.

A detection device 116 the device 110 which otherwise like the detection device 16 the device 10 is formed comprises an amplifier 130 for amplifying a raw signal generated, for example, by photodetection, for generating the detection signal 71 , The detection device 116 For example, it may comprise a photodiode or other transducer than a photosensor, by means of which the detection means 116 incident photons of the scattered light rays 52 can be converted into an electrical voltage as a raw signal. The photosensor is preferably in the measuring chamber 12 arranged while the amplifier 130 of which may be arranged separately.

The light beam provided 51 traversing particles 2 generate a light beam profile from the detector 116 detected scattered light rays 52 as exemplified in 3 is shown.

3 schematically shows a graph showing a light intensity 91 the detected scattered light rays 52 as a function of time 92 shows. A light intensity function 96 indicating an intensity spectrum of the detected scattered light rays 52 represents is in 3 for better understanding example of detected scattered light rays 52 a single recorded particle 2 represented, in the real case, a plurality of particles 2 the light beam provided 51 also at the same time, can reflect. The light intensity function 96 in 3 has a peak 95 with a height 93 and a half-width 94 on.

The structure of the peak 95 Stems, therefore, that the light beam 51 crossing particles 2 first in an edge region of the provided light beam 51 enters, in which the light beam 51 has a lower intensity due to its, for example, Gaussian intensity profile. Thus, the scattered detected light rays are also 52 on entry and exit from the light beam 51 less than in the center of the light beam 51 , which causes the peak 95 in 3 results. The same is true for particles 2 which the light beam provided 51 such that they do not pass through an intensity center in the geometric center of the light beam provided 51 happen.

The provisioning device 14 can be so relative to the measuring chamber 12 be arranged that a center of the provided light beam 51 a center of the expected fluid flow of the fluid 1 through the measuring chamber 12 crosses. Since lower flow velocities of the fluid are to be expected at the edge of the fluid flow than at the center of the fluid flow, particles are needed 2 longer at the edge of the fluid stream, around the light beam 51 to cross. When the light beam 51 in the region of the edge of the fluid flow but at the same time has a smaller width due to its intensity profile, the half-width can 94 on a particle 2 generated at the edge of the fluid flow scattered light beam 52 advantageously be similar to the half width 94 one on a particle 2 scattered light beam generated at the center of the fluid flow 52 , which moves comparatively faster.

The half width 94 which is also denominatable as the pulse width of a particle pulse, that is, a detected scattering event, is a measure of a moving speed of the particle 2 through the measuring chamber 12 and thus for the flow rate of the fluid 1 through the measuring chamber 12 , The computing device 20 may be configured based on a plurality of determined half widths 94 for peaks 95 a plurality of detected scattered light beams 52 a flow rate, in particular an average flow rate, of the fluid 1 through the measuring chamber 12 to estimate or to determine.

The computing device 120 may be configured to evaluate a plurality of particle pulses using statistical techniques to provide a detailed time history of the flow rate of the fluid 1 through the measuring chamber 12 to investigate. For example, a weighted or an equally weighted average may be calculated.

Based on eg the computing device 120 stored geometric dimensions of the measuring chamber 12 is thus from a count rate of particle pulses and from the determined flow rate of the fluid 1 a particle concentration of the particles 2 in the fluid 1 determined. The computing device 120 can thus be designed to have an absolute particle number, a particle number per unit time, and / or a particle concentration of particles 2 in the fluid 1 to calculate, in particular to calculate, and to provide.

The device 110 further includes an optional sensor device 122 which is adapted to at least one movement parameter of a movement of the device 110 to detect and based on a sensor signal 72 to create. The sensor signal 72 is sent to the computing device 120 transmitted. The at least one parameter may in particular be a speed of the device 110 or an acceleration of the device 110 act. The sensor device 122 In particular, one may be an acceleration sensor of a mobile terminal, as part of which the device 110 is trained.

The sensor device 122 may in particular have an inertial sensor or be designed as an inertial sensor. The sensor device 122 and / or the computing device 120 may be configured to the sensor signal 72 When indexing these accelerations, integrate to a moving speed of the device 110 , in particular the measuring chamber 12 , relative to the surrounding fluid 1 , from the sensor signal 72 to calculate.

The computing device 120 is designed to the particles 2 additionally in dependence on the sensor signal 72 to detect. The computing device 120 For example, it can be designed to be the one from the sensor signal 72 calculated velocity and / or acceleration data to plausibility of the flow rate of the fluid 1 through the measuring chamber 12 , which due to the half width 94 the peaks 95 the radiation intensity function 96 calculated, plausibility and / or vice versa. It can also be provided an algorithm which both the half-widths 94 as well as the sensor signal 72 used to make a plausible movement, especially speed, of the device 110 relative to the device 110 surrounding fluid 1 to determine and based on the movement thus determined, in particular speed and the count rate of scattering in the measuring chamber 12 on particles 2 the particles 2 to detect.

In particular, when the fluid is ambient air, a proportion of wind and a proportion of movement of the flow rate of the ambient air as a fluid 1 through the measuring chamber 12 be determined. The particles 2 can be detected based on the determined wind fraction and the determined motion component.

The height 93 of the peak 95 , which is also denoted as pulse height, correlates with the aerodynamic diameter of the respective particle 2 at which the corresponding detected light beam 52 was scattered. The computing device 120 may be designed based on a variety of determined heights 93 for peaks 95 a plurality of detected scattered light beams 52 an averaged aerodynamic diameter of the particles 2 to estimate or to determine.

The device 110 further includes an optional hint device 126 , which is designed as a function of at least the sensor signal 72 , in particular automatically, a warning signal 73 to generate and the warning signal 73 a user of the device 110 provide. The warning signal 73 indicates how the device 110 to move through the user is to the fluid 2 into the device 110 and through the measuring chamber 12 to pass through. The indication signal can be, for example, an acoustic, in particular linguistic, and / or an optical and / or a haptic indication signal 73 be.

The warning signal 73 For example, a screen may be driven to output a graphical display that indicates to the user, such as the device 110 to move. The screen can be an internal screen of the device 110 be. Alternatively or additionally, the screen may also be one of the devices 110 external screen, for example, a screen of a mobile terminal, as part of the device 110 is trained. For this an app of the mobile terminal can be used. The notice device 126 may be a processor of a mobile terminal, as part of which the device 110 is formed and can also with the computing device 120 be identical.

4 shows a schematic cross-sectional view of a device 210 for detecting particles 2 in a fluid 1 according to yet another embodiment of the present invention. The device 210 is a variant of the device 110 and can all be in terms of the device 110 include described elements and developments. A fluid guiding device 218 the device 210 , instead of the fluid guiding device 18 the device 110 , has an inlet opening 217 with a first cross section through which the fluid 1 during the movement of the device 210 into the device 210 , in particular in the fluid guiding device 218 , is einbringbar.

The fluid guiding device 218 furthermore has an outlet opening 219 on, through which the fluid 1 after passing the fluid 1 through the measuring chamber 12 from the device 210 , in particular from the fluid guide device 218 , is derivable. The outlet opening 219 may also be formed with the first cross section. Between the entrance opening 217 and the exit opening 219 is within the fluid guide device 218 the measuring chamber 12 arranged. The fluid guiding device 218 is formed as a channel, for example, with a round, oval, rectangular or square cross-section, which is on both sides, that is, both of the inlet opening 217 starting, as well as from the outlet opening 219 starting, to the measuring chamber 12 reduced to a second cross section, which is smaller in area than the first cross section.

In 4 the situation is shown that the device 210 is moved straight from right to left, leaving fluid 1 therefore from the entrance opening 217 , from the left, through the measuring chamber 12 through, to the outlet opening 219 flows. It should be understood that when the device 210 instead, moving from left to right, the fluid 1 vice versa by the fluid guiding device 218 and the measuring chamber 12 flows. The fluid guiding device is advantageous 218 in an area around the measuring chamber 12 , or else completely, mirror-symmetrically with respect to a mirror plane formed by the measuring chamber 12 runs. The mirror symmetry plane of the mirror symmetry of the fluid guide device 218 is in particular perpendicular to the preferred or expected direction of movement of the fluid 1 arranged. Due to the mirror symmetry of the fluid guide device 218 is the device 210 when swinging the device back and forth 210 , ie from left to right and from right to left, each just as good to use and therefore very powerful.

In the device 210 according to 4 is a photosensor 117 the detection device 116 within the measuring chamber 12 for detecting the scattered light rays 52 arranged while the amplifier 130 the detection device 116 outside the measuring chamber 12 is arranged. The device 210 can, as well as the device 110 , a computing device 120 (not shown) or designed to be connected to an external computing device that performs the same functions as the computing device 120 ,

5 shows a schematic cross-sectional view of a device 310 according to yet another embodiment of the present invention. The device 310 is a variant of the device 210 and different from the device 210 in the formation of a fluid guide device 318 the device 310 instead of the fluid guiding device 218 the device 210 , The fluid guiding device 318 is in principle as well as the fluid guide device 218 the device 210 constructed, namely with an inlet opening 317 , an exit opening 319 and one in between within the fluid guide means 318 arranged measuring chamber 12 , In contrast to the fluid guide device 218 has the fluid guiding device 318 a deflection unit 326 between the measuring chamber 12 and the exit opening 319 on, through which the fluid 1 in the fluid guiding device 318 is deflected, in particular by 90 °. The deflection device 326 For example, as a kink in a flow channel of the fluid guide device 318 be educated. The fluid guiding device 318 Although also has a mirror symmetry plane, which in the measuring chamber 12 is arranged, but is due to the one-sided of the measuring chamber 12 mounted deflection device 326 no longer completely mirror-symmetrical, but only in one area around the measuring chamber 12 around.

6 shows a schematic cross-sectional view of a device 410 according to yet another embodiment of the present invention. The device 410 is a variant of the device 310 and differs from this in the formation of a fluid guide device 418 the device 410 instead of the fluid guiding device 318 the device 310 , The fluid guiding device 418 points, as well as the fluid guide device 318 the device 310 , a first deflection 426 between the measuring chamber 12 and an exit opening 419 the fluid guiding device 418 on. In addition, the fluid guiding device has 418 a second deflecting device 426 ' between the measuring chamber 12 and an entrance opening 417 the fluid guiding device 418 on. The fluid guiding device 418 is thus formed point-symmetrical with respect to a point which within the measuring chamber 12 is arranged, in particular in the geometric center of the photosensor 117 the detection device 116 the device 410 ,

7 shows a schematic plan view of a mobile terminal 1310 according to yet another embodiment of the present invention. The mobile device 1310 For example, a smartphone or a tablet, includes the device 310 according to 5 , wherein the inlet opening 317 on a first outside 1301 of the mobile terminal 1310 is arranged and wherein the outlet opening 319 the device 310 on a second outside 1302 of the mobile terminal 1310 is arranged, wherein the first and the second outer side 1301 . 1302 are arranged at right angles to each other. At the mobile terminal 1310 it is the first outside 1301 around a long side surface of a substantially rectangular mobile terminal 1310 ) and at the second page 1302 around a short side surface of the mobile device 1310 , In 7 is also a back 1304 of the mobile terminal 1310 shown a camera 1303 , a speaker 1305 and a flash 1306 having.

8th shows a schematic side view of a mobile terminal 1410 according to yet another embodiment of the present invention. The mobile device 1410 For example, a smartphone or a tablet, includes the device 410 according to 6 , The entrance opening 417 the device 410 of the mobile terminal 1410 is at a front 1401 of the mobile terminal 1410 arranged. The outlet opening 419 the device 410 of the mobile terminal 1410 is at a back 1402 of the mobile terminal 1410 arranged. The front 1401 and the back 1402 are arranged parallel to each other. In 8th is also a camera 1403 , an on / off button 1405 as well as a volume control 1406 of the mobile terminal 1410 shown.

9 shows a schematic flowchart for explaining a method for detecting particles 2 on a fluid according to an embodiment of the present invention. The method according to 9 is with the device according to the invention, in particular in one of the devices according to the invention 10 ; 110 ; 210 ; 310 ; 410 feasible and is adaptable according to all mentioned in relation to the inventive device modifications and variants and vice versa.

In a first step S01 becomes a light beam 51 provided such that the provided light beam 51 in a measuring chamber 12 entry. In a step S02, the measuring chamber becomes 12 relative to the fluid 1 moved to the fluid 1 through the measuring chamber 12 through, for example, as with respect to the devices according to the invention 10 ; 110 ; 210 ; 310 ; 410 ; 510 described.

In a step S03, the particles become 2 in the fluid passed through 1 in the measuring chamber 12 scattered, in particular reflected, light rays 52 detected, which by scattering, in particular reflection, of the light beam provided 51 on the particles 2 arise. In a step S04, a detection signal becomes 71 based on the detected scattered light rays 52 generated. In a step S05, the particles become 2 based on the generated detection signal 71 detected.

In an optional step S06, a moving parameter of moving S02 becomes the measuring chamber 12 relative to the fluid 1 detects, in particular a speed and / or an acceleration of the measuring chamber 12 For example, as with respect to the device according to the invention 110 described. Detecting S05 of the particles 2 may additionally based on the detected Motion parameters take place. For detecting S06 of the movement parameter, in particular a sensor, preferably an acceleration sensor, of a mobile terminal 1310 ; 1410 be used.

The detection S05 may be additional or alternative, as with respect to the device 110 and 2 detailed or previously explained in general terms. In particular, a flow rate can also be determined, as with respect to the device 110 In addition, the detection S05 may additionally be based on the determined flow rate.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US Pat. No. 8009290 B2 [0004]

Claims (11)

Contraption ( 10 ; 110 ; 210 ; 310 ; 410 ) for detecting particles ( 2 ) in one the device ( 10 ; 110 ; 210 ; 310 ) surrounding fluid ( 1 ), comprising: a measuring chamber ( 12 ); a provisioning device ( 14 ), which is designed to receive a light beam ( 51 ) such that the light beam provided ( 51 ) into the measuring chamber ( 12 ) entry; a detection device ( 16 ; 116 ), which is adapted to the particles ( 2 ) in the measuring chamber ( 12 ) scattered light rays ( 52 ) and based thereon a detection signal ( 71 ) to create; and a fluid guiding device ( 18 ; 218 ; 318 ; 418 ), by means of which the fluid ( 1 ) by a movement of the device ( 10 ; 110 ; 210 ; 310 ; 410 ) into the device ( 10 ; 110 ; 210 ; 310 ; 410 ) and through the measuring chamber ( 12 ) is hindurchleitbar. Contraption ( 110 ; 210 ; 310 ; 410 ) according to claim 1, wherein the device ( 10 ; 110 ; 210 ; 310 ; 410 ) a computing device ( 120 ), which is adapted to the particles ( 2 ) based on the generated detection signal ( 71 ) and based thereon an output signal ( 75 ) to create. Contraption ( 110 ; 210 ; 310 ; 410 ) according to claim 2, comprising: a sensor device ( 122 ), which is adapted to a movement parameter of a movement of the device ( 110 ; 210 ; 310 ) and based thereon a sensor signal ( 72 ) to create; and wherein the computing device ( 120 ) is adapted to the particles ( 2 ) additionally in dependence on the sensor signal ( 72 ) to detect. Contraption ( 110 ; 210 ; 310 ; 410 ) according to claim 2 or 3, wherein: the computing device ( 120 ) is designed based on at least one temporal light intensity function ( 96 ) at least one scattered light beam ( 52 ) a flow rate of the particles ( 2 ) through the measuring chamber ( 12 ) and the particles ( 2 ) in addition to detect in dependence on the determined flow rate. Contraption ( 110 ; 210 ; 310 ; 410 ) according to claim 3, with a hinting device ( 126 ), which is designed in dependence on at least the sensor signal ( 72 ) a warning signal ( 73 ) and the warning signal ( 73 ) a user of the device ( 110 ; 210 ; 310 ; 410 ) to provide; where the indication signal ( 73 ) indicates how the device ( 110 ; 210 ; 310 ; 410 ) is to be moved by the user to the fluid ( 2 ) into the device ( 110 ; 210 ; 310 ; 410 ) and through the measuring chamber ( 12 ). Contraption ( 310 ; 410 ) according to one of claims 1 to 5, wherein the fluid guiding device ( 318 ; 418 ) at least one deflection unit ( 326 ; 426 . 426 ' ), which is adapted to the fluid ( 1 ) before entering the measuring chamber ( 12 ) and / or after exiting the measuring chamber ( 12 ) to divert. Contraption ( 210 ; 310 ; 410 ) according to one of claims 1 to 6, wherein the fluid guiding device ( 218 ; 318 ; 418 ) at least in an area around the measuring chamber ( 12 ) symmetrical with respect to the measuring chamber ( 12 ) is trained. Mobile terminal ( 1310 ; 1410 ) with: a device ( 310 . 410 ) according to one of claims 1 to 7. Method for detecting particles ( 2 ) in a fluid ( 1 comprising the steps of: providing (S01) a light beam ( 51 ) such that the light beam provided ( 51 ) in a measuring chamber ( 12 ) entry; Moving (S02) the measuring chamber ( 12 ) relative to the fluid ( 1 ) to the fluid ( 1 ) through the measuring chamber ( 12 ) to pass through; Detecting (S03) of at the particles ( 2 ) in the passed-through fluid ( 1 ) in the measuring chamber ( 12 ) scattered light rays ( 52 ); Generating (S04) a detection signal (S04) 71 ) based on the detected scattered light rays ( 52 ); and detecting (S05) the particles (S05) 2 ) based on the generated detection signal ( 71 ). A method according to claim 9, comprising the step of: detecting (S06) a movement parameter of moving (S02) the measuring chamber ( 12 ) relative to the fluid ( 1 ); wherein detecting (S05) the particles (S05) 2 ) is additionally performed based on the detected motion parameter. The method of claim 10, wherein for detecting (S06) the motion parameter, an acceleration sensor of a mobile terminal ( 1310 ; 1410 ) is used.

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