A method and a smart gas Internet of Things (IoT) system for determining a gas metering strategy are provided. The method includes: determining, based on time-dividing point correlation data, at least one group of candidate time-dividing points; determining, based on an assessment mode, an assessment result of the at least one group of candidate time-dividing points; determining, based on the assessment result, the at least two time-dividing points, wherein the at least two time-dividing points form at least one group of time-dividing point groups; transmitting at least two sound waves of different frequencies at the at least two time-dividing points and receiving at least two echo signals; determining, based on the at least two echo signals, a gas flow difference; determining, based on the gas flow difference, whether a noise interference exists; and in response to a determination that the noise interference exists, adjusting the gas metering strategy.

The present invention relates to a viscosity measuring method. More particularly, the present invention relates to a viscosity measuring method comprising: (i) a step of acquiring an image of a droplet in a static state without vibration; (ii) a step of using a vibrator to vibrate the droplet, and acquiring an image of a dynamic state in which the droplet is maximally extended in a horizontal direction or maximally extended in a vertical direction; (iii) a step of obtaining the static curvature change rate and the dynamic curvature change rate of the interface of the droplet from the images acquired in steps (i) and (ii); and (iv) a step of substituting the ratio of the static curvature change rate to the dynamic curvature change rate of the droplet interface into an interaction equation compensating for the vibrator, so as to obtain the viscosity of the droplet.

An apparatus for determining and/or monitoring at least one process variable of a medium in a container comprising an oscillatable unit for introduction into the container; a housing, wherein the oscillatable unit is connected with the housing such that the oscillatable unit closes the housing terminally; at least one hollow space in the oscillatable unit which is accessible from an inner space formed by the housing; and a driving/receiving unit for exciting the oscillatable unit to execute mechanical oscillations and for receiving the mechanical oscillations and for transducing them into an electrical, received signal. Inventive features including that the driving/receiving unit is present in such a manner in the hollow space and that the hollow space is filled with a potting material in such a manner that the driving/receiving unit is connected via the potting material for force coupling with a wall of the hollow space.

A system and method for measuring one or more viscoelastic properties of a material under measurement is disclosed. The system includes an emitter-observer transducer pair separated by the material. A signal processing assembly is operable to (i) apply a plurality of excitation signals to the emitter transducer, wherein each of the excitation signals comprises a continuous-wave sinusoidal waveform, (ii) record a plurality of output signals at the observer transducer, wherein each of the output signals corresponds to one of the excitation signals, (iii) analyze the output signals to measure the sound speed of the material, and (iv) determine the viscoelastic properties of the material under measurement by optimizing the parameters of an infinite echo model. The system provides a non-destructive approach for in-situ measurement of viscoelastic material properties.

Apparatus for the measurement of a fluid property is shown generally at (10). The apparatus is typically suitable for the measurement of a property of a fluid (not shown) such as its viscosity, and comprises a tube (12) for the through-flow of fluid to be measured, a torsion bar (14), a magnetic drive coil (16) and a magnetic pick-up coil (18). The tube (12) is mounted within a casing (20), shown in cutaway. An inertial frame (22) is secured to the casing via isolators (not shown). The tube (12) has a web portion (24) supporting inertial masses (26) connected to, and radially spaced from, the tube (12). The tube is connected at each end to pipe fittings (28) via end flanges (30) and seals (32). The single tube (12) has been selectively machined to produce areas (12a) of low compliance which effectively form springs. The torsion bar (14) is of relatively low inertia and is fixed at the midpoint of the length of the tube (12). The mass system (24, 26) is of much higher inertia and is fixed to the tube (12) as shown. The tube (12) is then fixed in frame (22) which is of even higher inertia, and held in place in casing (20) by means of fixing supports (not shown).

Shear waves are generated and measured in viscoelastic phantoms by a single push beam. Using numerical simulations or an analytical function to describe the diffraction of the shear wave, the resulting shear wave motion induced by the applied push beam is calculated with different shear elasticity values and then convolved with a separate expression that describes the effects of viscosity value for the medium. The optimization algorithm chooses the tissue parameters which provide the smallest difference between the measured shear waveform and the simulated shear waveform. A shear viscosity image is generated by applying such optimization procedure at all of the observation points.

A method for evaluating Dry Eye Disease (DED) in a human or animal subject is provided. Thread thinning dynamics of a tear sample of the subject are determined using an acoustically-driven microfluidic extensional rheometry instrument. At least one physical parameter value of the tear sample is calculated based at least in part on the determined thread thinning dynamics. DED is evaluated based at least in part on the at least one calculated physical parameter value of the tear sample. A device for evaluating Dry Eye Disease (DED) in a human or animal subject is also provided. The device includes an acoustically-driven microfluidic extensional rheometry instrument and a processing device configured to evaluate DED based at least in part on the calculated at least one physical parameter value of the tear sample.

The present invention relates to a viscosity measuring method. More particularly, the present invention relates to a viscosity measuring method comprising: (i) a step of acquiring an image of a droplet in a static state without vibration; (ii) a step of using a vibrator to vibrate the droplet, and acquiring an image of a dynamic state in which the droplet is maximally extended in a horizontal direction or maximally extended in a vertical direction; (iii) a step of obtaining the static curvature change rate and the dynamic curvature change rate of the interface of the droplet from the images acquired in steps (i) and (ii); and (iv) a step of substituting the ratio of the static curvature change rate to the dynamic curvature change rate of the droplet interface into an interaction equation compensating for the vibrator, so as to obtain the viscosity of the droplet.

Vibronic sensor and method of operation for monitoring the density and/or the viscosity of a medium in a container, comprising a mechanically oscillatable unit, a driving/receiving unit and an electronics unit, wherein the driving/receiving unit is embodied, using an electrical exciter signal, to excite the mechanically oscillatable unit to execute mechanical oscillations, and to receive the mechanical oscillations and to convert them into an electrical, received signal, wherein the electronics unit is embodied to produce the exciter signal such that a predeterminable phase shift is present between the exciter signal and received signal, wherein the electronics unit is embodied to set a first predeterminable phase shift and a second predeterminable phase shift, and to ascertain a first frequency and a second frequency corresponding to the predeterminable phase shifts, and to determine from the two frequencies the density and/or the viscosity of the medium using a first and/or second analytical formula.

System, methods, and apparatuses for determining properties of a production fluid downhole are presented. In one instance, a system includes a sample-filled sensing device for vibrating a first suspended tube containing a sample of production fluid and producing a first response signal. The system also includes a reference-fluid sensing device with a second suspended tube containing a viscosity-tunable fluid therein. The system vibrates the second suspended tube to create a second response signal. The viscosity of the viscosity-tunable fluid is varied until it is deemed to match that of the sample production fluid. Other systems and methods are presented.