Various embodiments include a method for determining the mixing ratio R of a fluid comprising a mixture of at least two different fluids for a technical process in a device comprising: irradiating an ultrasonic signal with a transmission level along a measuring distance running inside a measuring section; measuring a receiving level of the ultrasonic signal at one end of the measuring distance; determining an ultrasonic attenuation of the ultrasonic signal attenuated by the fluid based at least on the transmission and receiving levels of the ultrasonic signal; measuring a temperature of the fluid flowing through the measuring section; and determining a mixing ratio of the at least two different fluids from the determined ultrasonic attenuation and from the measured fluid temperature.

A first heat generator heats a mixture of fluids to a first temperature. A predetermined thermal property value of the mixture set to the first temperature is obtained, the first heat generator heats the mixture to a second temperature, the thermal property value of the mixture set to the second temperature is obtained. First relationship information between the thermal property value of the mixture set to the first temperature and a mixture ratio of a first fluid is obtained. Second relationship information between the thermal property value of the mixture set to the second temperature and the mixture ratio of the first fluid is obtained. Mixture ratios are calculated based on the thermal property value of the mixture set to the first temperature, the thermal property value of the mixture of fluids set to the second temperature, the first relationship information, and the second relationship information.

A system for analyzing a fluid includes an in-line sensor configured to analyze a fluid flowing past the in-line sensor to determine at least one in-line value of a fluid parameter of the fluid across an event period, and a sample sensor configured to analyze a sample of fluid extracted from the flow of fluid during the event period, to determine sample value of the fluid parameter for the sample. At least one processor is provided, configured to determine a representative in-line value of the fluid parameter across the event period based at least in part on the at least one in-line value, and determine an overall representative value of the fluid parameter across the event period based on the representative in-line value, the sample value for the sample, and one or more of the in-line values corresponding to the time of extracting the sample, wherein determination of the overall representative value is based on an error correction value determined for the in-line sensor during the event period.

Methods, systems, devices, and products for evaluating a downhole fluid in a borehole intersecting an earth formation. Methods include using ultrasonic irradiation to produce sonoluminescence from cavitation in a volume of the fluid; obtaining spectral information from measurement of the sonoluminescence with a light-responsive device; and estimating a parameter of interest of the fluid from the spectral information. The parameter may be a composition of the fluid or concentration of: i) at least one chemical element in the volume; i) at least one molecular element in the volume. Methods include deconvolving a response spectrum by using one or more separately determined standard spectra, or estimating the parameter of interest using spectral lines represented by the spectral information. Methods may include using an optically transparent ultrasonic transducer to produce the cavitation at the interface of the transducer, with optically transparent ultrasonic transducer between the interface and the light-responsive device.

Methods are provided for characterizing the stability of a distillate fraction using a quartz crystal microbalance apparatus, such as a distillate fraction derived at least in part from a pre-refined crude oil. A sample can be aged for an aging period in a quartz crystal microbalance apparatus, and a frequency value for the sample in the quartz crystal microbalance apparatus can be determined before and after the aging period to determine a frequency difference. This frequency difference can be correlated directly with the ability of a jet fuel fraction to satisfy a stability test standard, such as a jet fuel breakpoint stability. The methods can also include using a temperature profile during characterization that can reduce or minimize operator error during the characterization.

A device is provided that is intended to simultaneously measure and identify at least two characteristics of multiphase fluid flows through the device and/or equipment attached to the device. The device has a lower measurement medium invasive compartment comprised of at least two ultrasonic and/or acoustic transducers, a piezo-resistive sensing element, and a resistance temperature detector (RTD) to make simultaneous independent measurement. A pathway connects to the device's upper electronic compartment comprised of an accelerometer array, multiple stacked circuit boards providing power, sensing interface, processing, calculation, and network communication functionalities. The device is capable of measuring, processing, and calculating simultaneous independent pressure, temperature, flow rate, and vibration measurement. The device reports data to an external system via either wired and/or wireless communication channel.

A system for analysing a fluid is described, including an in-line sensor configured to analyse a fluid flowing past the in-line sensor to determine at least one in-line value of a fluid parameter of the fluid across an event period, and a sample sensor configured to analyse a sample of fluid extracted from the flow of fluid during the event period, to determine a sample value of the fluid parameter for the sample. At least one processor is provided, configured to determine a representative in-line value of the fluid parameter across the event period based at least in part on the at least one in-line value, and determine an overall representative value of the fluid parameter across the event period based on the representative in-line value, the sample value for the sample, and one or more of the in-line values corresponding to the time of extracting the sample, wherein determination of the overall representative value is based on an error correction value determined for the in-line sensor during the event period.

Various embodiments include a method for determining the mixing ratio R of a fluid comprising a mixture of at least two different fluids for a technical process in a device comprising: irradiating an ultrasonic signal with a transmission level along a measuring distance running inside a measuring section; measuring a receiving level of the ultrasonic signal at one end of the measuring distance; determining an ultrasonic attenuation of the ultrasonic signal attenuated by the fluid based at least on the transmission and receiving levels of the ultrasonic signal; measuring a temperature of the fluid flowing through the measuring section; and determining a mixing ratio of the at least two different fluids from the determined ultrasonic attenuation and from the measured fluid temperature.

A device is provided that is intended to simultaneously measure and identify at least two characteristics of multiphase fluid flows through the device and/or equipment attached to the device. The device has a lower measurement medium invasive compartment comprised of at least two ultrasonic and/or acoustic transducers, a piezo-resistive sensing element, and a resistance temperature detector (RTD) to make simultaneous independent measurement. A pathway connects to the device's upper electronic compartment comprised of an accelerometer array, multiple stacked circuit boards providing power, sensing interface, processing, calculation, and network communication functionalities. The device is capable of measuring, processing, and calculating simultaneous independent pressure, temperature, flow rate, and vibration measurement. The device reports data to an external system via either wired and/or wireless communication channel.

A through-hole (3) is disposed in a supporting substrate (2). Plate-shaped beams (4 (4A, 4B)) each includes a piezoelectric element, extends from an edge of the through-hole (3) toward an opposite edge to close a part of the through-hole (3), supports a substance adsorption film to which a constitutive substance to be detected adheres, and has a vibration frequency that is varied due to adhesion of the constitutive substance to the substance adsorption film. Drive electrodes (16) apply a voltage to the piezoelectric element to vibrate and deform the beams (4). Detection electrodes (17) detect information about the vibration frequencies of the beams (4).