549results about "Fluid speed measurement using thermal variables" patented technology

The invention provides a flexible palladium film hydrogen sensor and a preparation method thereof, the flexible palladium film hydrogen sensor is sequentially provided with a flexible substrate, a hydrogen sensitive sensing layer and a contact connection layer from bottom to top, and the contact connection layer is connected with a resistance measurement unit; and the hydrogen-sensitive sensing layer is a palladium or palladium alloy film with a conical micro-nano structure. The palladium or palladium alloy thin film with the conical micro-nano structure provides a hydrogen sensor conical surface micro-nano structure with a high specific surface area for the flexible palladium thin film hydrogen sensor, and the process that hydrogen is adsorbed, dissolved and diffused into the palladium or palladium alloy thin film is accelerated, so that the response speed of the sensor is increased; according to the hydrogen sensor, the flexible substrate is adopted, so that the hydrogen sensor can be conveniently arranged in various narrow spaces, and the applicability of the hydrogen sensor in various scenes is improved.

The invention discloses a TGV technology-based MEMS thermal flow velocity sensor convenient for integrated packaging and a preparation method thereof. The TGV technology-based MEMS thermal flow velocity sensor comprises a glass substrate, a metal conductive through column, a side wall metal seed layer, an adhesion layer, a temperature measurement resistor, a central heating resistor, an insulation protection layer and a pressure welding block. Wherein the TGV conductive metal through column is formed by performing through hole forming on the glass and then performing side wall seed layer deposition and metal electroplating and filling processes. According to the metal conductive through column, an electric signal of a sensor chip on the front surface of the chip can be transmitted to the back surface of the chip, so that the chip can be conveniently integrated and packaged with other sensor chips, and the development requirements of MEMS devices in the multi-sensor integration and multi-functionalization directions are met. A traditional thermal type MEMS flow velocity sensor is manufactured on a silicon substrate, the sensor is manufactured on a glass through hole TGV substrate, the low heat conductivity coefficient of the glass substrate inhibits invalid heat diffusion of a heating resistor in the center of the thermal type flow velocity sensor, and the sensitivity and performance of the device are improved.

Apparatuses and methods for drying objects are provided. The apparatus can comprise a housing configured to provide an airflow channel having an airflow inlet and an airflow outlet, an airflow generating element configured to generate an airflow through the airflow channel, and one or more radiation energy sources configured to generate infrared radiation and direct the infrared radiation toward an exterior of the housing. A device controller can control the operation of the airflow generating element and the one or more radiation energy sources, and a power element controller in connection with the device controller can control the operation of the power element that can provide power at least to the radiation energy source and the airflow generating element.

The invention relates to the technical field of air conditioning treatment, in particular to an air volume monitoring method and system for a centrifugal ventilator. The method comprises the steps that the difference between all belt tension data obtained through real-time monitoring data and experiment monitoring data is analyzed; calculating the deviation degree of the air volume value of the real-time monitoring data measured based on the static pressure method under different frequencies, and obtaining the real-time air volume value; based on the fluctuation degree of the wind speed data in all the wind speed sensors, the disordered distribution condition of the fluctuation degree calculated by all the wind speed sensors and the average distribution condition of the fluctuation degree calculated at all the collection moments are utilized, the reliability of real-time wind quantity measurement based on the wind speed method is obtained, and the real-time wind quantity is determined; and the final air volume of the centrifugal fan is determined by combining the air volume values measured in real time through the static pressure method and the air speed method and the deviation degree and reliability of the respective measurement methods. The invention aims to integrate the results of the static pressure method and the wind speed method and improve the overall accuracy and reliability of the air volume measurement.

The invention provides a liquid drop continuous generation device which comprises a first flow channel and a second flow channel, the first flow channel and the second flow channel comprise first positions which are tightly attached to each other, and each first position comprises a through hole communicating with the first flow channel and the second flow channel; the first flow channel and the second flow channel are used for introducing a first liquid and a second liquid respectively; the special ultrasonic device can act on the first liquid in the first flow channel, when the special ultrasonic device is driven in a first power period, an acoustic beam current facing the through hole is generated in the first liquid, the acoustic beam current enters the second liquid through the through hole, and liquid drops formed by the first liquid are formed in the second liquid. The invention also correspondingly provides a method for continuously generating liquid drops. The liquid drop generation mode is more flexible, the controllability is higher, and the cost is lower.

A system may include a static air temperature probe attached to an aircraft, an electronic flight instrument system, and a processor. The processor may be configured to measure a static air temperature at the aircraft using the static air temperature probe. The processor may further be configured to calculate a Mach number associated with the aircraft based at least partially on the static air temperature. The processor may also be configured to calculate a true air speed of the aircraft based on the Mach number. The processor may display an indication of the true air speed using the electronic flight instrument system. The processor may also be configured to calculate the speed of sound based at least partially on the static air temperature.

A microelectronic socket structure and a method of forming the same. The socket structure comprises: a socket structure housing defining a cavity therein; and an interconnection structure including: a contact element disposed at least in part within the cavity, and configured to be electrically coupled to a corresponding microelectronic package, the contact element corresponding to one of a signal contact element or a ground contact element; and a conductive structure disposed at least in part within the cavity, electrically coupled to the contact element, and having an outer contour that is non-conformal with respect to an outer contour of the contact element.

The invention belongs to the technical field of integrated circuit design, and particularly relates to a flexible thermoelectric flow velocity sensor for surface flow field monitoring, which comprises a flexible substrate, and a central heating circuit and a thermopile arranged on the flexible substrate, wherein the thermopile surrounds the periphery of the heating circuit, and a thermoelectric junction close to the heating circuit and a thermoelectric junction far away from the heating circuit are formed. The structure of the central heating circuit and the surrounding thermopile is adopted, the temperature difference output voltage generated by the heating circuit and the flow field is utilized to measure the flow velocity, and the use scene of the sensor is expanded through the arrangement of the flexible substrate.

The utility model provides a wind direction and wind speed measuring device and a steel structure tower device. The wind direction and wind speed measuring device comprises a sampling main body, the sampling main body comprises a plurality of air inlets and at least two air channels, the plurality of air inlets are correspondingly communicated with the at least two air channels, openings of the plurality of air inlets face at least two different directions, and the at least two air channels are mutually independent and extend in different directions; the first temperature detection assemblies are arranged in the air ducts and used for collecting temperature information of at least two different positions in the extending direction of the air ducts. The second temperature detection assembly is arranged inside or outside the air duct and used for collecting environment temperature information. The humidity detection assembly is arranged inside or outside the air duct and used for collecting environment humidity information. The controller is used for calculating wind power data according to the temperature information and the humidity information, and the wind power data comprises wind direction and wind speed. The 360-degree omni-directional wind speed and wind direction measuring device is beneficial to measuring 360-degree omni-directional wind speed and wind direction, wide in measuring range, high in reliability, easy to maintain and high in measuring precision.

The invention discloses a device and a method for measuring the velocity field of an autoclave through hot-pressing wind speed. The device comprises a thermosensitive probe, a Wheatstone bridge, a lock-in amplifier, an NI multi-channel data acquisition card and a computer, the thermosensitive probe is used for instantaneously detecting the temperature of a placement point position and generating resistance fluctuation based on sensing temperature change; the Wheatstone bridge is formed by connecting a fixed resistor, a variable resistor and a thermosensitive probe, and is used for forming a series circuit with the lock-in amplifier; the lock-in amplifier is used for supplying power to the Wheatstone bridge and providing co-frequency voltage at the same time, so that resistance data of a thermosensitive probe in the Wheatstone bridge is converted into voltage data to be output; the NI multi-channel data acquisition card is used for acquiring in-phase component voltage signals output by the lock-in amplifier; the computer is used for processing the voltage data to obtain the average speed and the pulsation speed of the measurement point. According to the invention, the problems of limited precision, insufficient sensitivity and poor adaptability to the internal environment of the autoclave in the conventional gas speed measurement method are solved.

A method for producing a nanochannel (200) is described with the following steps a) depositing a nanochannel sacrificial layer (3) using an ALD process on a substrate (1), which defines the subsequent channel height at least at one point b) depositing a first covering layer (4) on the nanochannel sacrificial layer (3) c) At least partially structuring and / or etching the nanochannel sacrificial layer (3) and the first cover layer (4) so ​​that a first exposed region (10) is formed d) At least partial etching of the now exposed nanochannel sacrificial layer (3) with an etching rate < 100nm / min, preferably <10nm / min, and particularly preferably <5nm / min and even more preferably <2nm / min, so that an under-etched second exposed region (20) is formed which defines the channel width e) depositing a second cover layer (5) onto the first cover layer (4) and the first exposed region (10) so that the second exposed region (20) is sealed and forms a nanochannel (200).

The invention provides a microneedle mold manufacturing method, a microneedle manufacturing method, a microneedle mold and a microneedle, relates to the technical field of microneedles, and can improve the manufacturing efficiency of the microneedle mold. The method comprises the following steps: providing a glass substrate, wherein the surface of the glass substrate is provided with at least one target area; a laser beam is used for modifying the target area in the thickness direction of the glass substrate, so that an inverted-cone-shaped modified area is formed on the glass substrate; the modified area is subjected to etching treatment through etching liquid to form an inverted-cone-shaped hole, the microneedle mold is obtained, and the microneedle mold is used for manufacturing a microneedle.

The invention relates to a method for producing at least one micromirror element (200) as it can be used in micro-electro-mechanical systems (100), in particular for use in semiconductor technology equipment (1), and to a micro-electro-mechanical system (100) comprising corresponding micromirror elements (200). The process includes the following steps: - Providing a flat, two-sided mirror substrate (210); - Incorporating a predetermined shape at least on the side (215) of the provided mirror substrate (210) intended to be reflective; and - Applying a reflective coating (220) at least to the side (215) of the provided mirror substrate (210) intended to be reflective.

The invention discloses a non-contact wire ice edge corona wind and leakage current measuring device and method, and relates to the field of corona wind and leakage current measurement. An icicle is fixed at the geometric center of the wire; the measuring assembly is used for detecting corona wind and leakage current generated by the wire; the automatic lifting platform is used for controlling the vertical distance between the measuring assembly and the icicle; the invention provides the non-contact comprehensive measuring device for the first time, the corona wind speed and the leakage current can be synchronously measured, the discharge phenomenon can be observed in real time, the technical blank is filled, and the measuring device is high in practicability and high in practicability. Through the transparent acrylic shell, the tip discharge phenomenon of the icicle can be directly observed, real-time recording of the discharge form in the experiment process is facilitated, the shell fixes a wire at the geometric center, it is ensured that the icicle is vertically downward, uneven field intensity distribution is avoided, and a stable electric field environment is provided for measurement.

The present disclosure is drawn to inertial pumps. An inertial pump can include a microfluidic channel, a fluid actuator located in the microfluidic channel, and a check valve located in the microfluidic channel. The check valve can include a moveable valve element, a narrowed channel segment located upstream of the moveable valve element, and a blocking element formed in the microfluidic channel downstream of the moveable valve element. The narrowed channel segment can have a width less than a width of the moveable valve element so that the moveable valve element can block fluid flow through the check valve when the moveable valve element is positioned in the narrowed channel segment. The blocking element can be configured such that the blocking element constrains the moveable valve element within the check valve while also allowing fluid flow when the moveable valve element is positioned against the blocking element.

The invention discloses a speed measurement system of a hot-wire anemometer and a control method thereof, and the system comprises a bridge sensor module which comprises a bridge comprising a detection resistor, and when the resistance value of the detection resistor changes along with the wind speed, the voltage difference value of the output end of the bridge is larger than a difference value threshold value; the analog-to-digital conversion circuit is used for converting a voltage analog signal output by the bridge output end into a digital signal; the central processing module is connected with the analog-to-digital conversion circuit and is used for receiving the digital signal and generating a feedback signal based on the digital signal; and the digital-to-analog conversion circuit is used for converting the feedback signal into a bridge top voltage analog signal, inputting the bridge top voltage analog signal to the bridge, and adjusting the bridge top voltage of the bridge to enable the voltage difference value to be smaller than or equal to the difference value threshold value. According to the system, active closed-loop adjustment is realized through a high-speed digital signal processing mode, and compared with a previous negative feedback hot-wire anemometer, the stability of the system is improved, the requirements on the performance of system components are reduced, the anti-electromagnetic interference capability is improved, and measurement errors caused by environmental factors are reduced.

The present disclosure provides a method for measuring flow velocity distribution of groundwater using distributed optical fiber with active heating, comprising: setting and optimizing field test parameters; conducting a background temperature monitoring test; performing a line-source active heating distributed temperature measurement test, including conducting multiple rounds of heating tests; denoising the obtained thermal plume attenuation signal data of the groundwater; and fitting the groundwater velocity-depth curve in the borehole by monitoring and analyzing the temperature difference signal between the internal temperature and the external temperature of the composite heating optical cable in a single depth section of the borehole, thereby obtaining a distributed groundwater velocity data set. The method of the present disclosure solves the problem that the existing groundwater flow velocity measurement technology cannot simultaneously conduct continuous and distributed measurements, improves the efficiency of groundwater velocity measurement, and it can avoid groundwater contamination during the measurement process.

The invention relates to a pneumatic membrane structure fluid-structure interaction multi-physics field synchronous test method, which relates to the technical field of vibration measurement, and comprises the following steps: conformally embedding a flexible capacitive sensor array in the surface of a pneumatic membrane structure, detecting mechanical vibration, ultrasonic wave, sound wave or infrasonic wave displacement through capacitance value change (electrical characteristics), and measuring the displacement of the flexible capacitive sensor array; and the capacitance value change rate delta C / C and the displacement delta x are in a linear proportional relationship. According to the pneumatic membrane structure fluid-solid coupling multi-physics field synchronous test method, a flexible capacitive sensor array is conformally embedded in the surface of a pneumatic membrane structure, and mechanical vibration, ultrasonic wave, sound wave or infrasonic wave displacement is directly detected by using capacitance value changes; wherein the linear proportional relation between the capacitance value change rate delta C / C and the displacement delta x is directly determined by the electrode distance and the dielectric constant of the capacitive sensor, so that the physical directness of vibration wave measurement is realized, the error caused by indirect calculation depending on a traditional strain gauge or an optical method is avoided, and the vibration wave displacement measurement precision is remarkably improved to + / -0.5% full scale.

The invention provides a test system, a calibration device and a test method. The test system comprises a hot wire probe which comprises an electric heating wire, a thermocouple and a supporting rod; the heating wire and the thermocouple are fixedly connected to the supporting rod; the hot-wire probe is used for performing flow velocity testing on fluid at a target position in a target flow field to obtain a flow velocity signal and performing temperature testing on the fluid at the target position to obtain a temperature signal; the electric heating wire and the thermocouple are located on the same vertical line, a first distance exists between the electric heating wire and the thermocouple, and the first distance enables the electric heating wire and the thermocouple not to influence each other under the conditions of flow velocity testing and temperature testing; the acquisition unit is connected with the hot-wire probe through a circuit; the temperature sensor is used for converting a flow velocity signal into a first electric signal and converting a temperature signal into a second electric signal; the calculating unit is connected with the collecting unit and used for determining the target temperature and the target flow speed of the target position based on the first electric signal and the second electric signal.

The invention discloses a density measurement array and a method for inverting a three-dimensional flow field based on a fluid density field change rate. According to the method, a temperature sensing array comprising temperature probes and an array structure is constructed through a temperature sensor, the temperature probes are arranged with a speed measurement point as the center, and the distance range is unequal from the micron level to the meter level. The array structure can adopt various geometric forms such as a rectangle, a circle and the like. Modeling is carried out by measuring a space distribution field of temperature, combining with calibration of a flow velocity meter and utilizing the relation between the temperature distribution change rate and the flow velocity, so that flow velocity information is inverted. By integrating a plurality of arrays, multi-point measurement of a three-dimensional flow field can be realized. According to the method, high-precision flow velocity measurement can be realized in an environment without scattering particles, and the measurement accuracy is further improved through multi-parameter verification. The range of measuring the fluid scale is wide, and an innovative solution is provided for monitoring the fluid flow speed.

A method and a device for two-dimensional local fluid flow measurement over surfaces are provided. The method comprises providing a device having a set of micro-structures forming a matrix structure, each one of the micro-structures comprising a membrane with an embedded temperature sensitive resistive device; arranging the device over a target surface; measuring, by an electronic unit of the device, a thermal impedance of each one of the micro-structures in the frequency domain; and obtaining, by the electronic unit, a velocity and angle of incidence of a local fluid flow on the target surface using an inverse algorithm that uses the measured thermal impedances.

The invention provides a packaging front plate, a preparation method thereof and a photovoltaic module. The packaging front plate comprises a body which is of a transparent structure; the radiation cooling layer is arranged on the surface of one side of the body, the radiation cooling layer has light transmittance, and the face, away from the body, of the radiation cooling layer is provided with a lotus leaf surface imitating micro-nano structure. The radiation cooling layer can radiate heat to the external space, so that the working temperature of the photovoltaic module is effectively reduced, the photoelectric conversion efficiency can be improved, the photovoltaic module can be prevented from running at a high temperature, and the service life of the photovoltaic module can be prolonged; furthermore, a micro-nano structure imitating the lotus leaf surface is designed on the radiation cooling layer, attachment of water drops or dirt on the surface of the radiation cooling layer can be reduced, and therefore the surface of the radiation cooling layer is kept clean and dry, the problem that the power generation efficiency is reduced due to pollution can be avoided, the cleaning frequency can be reduced, and the power generation efficiency is improved. And therefore, the maintenance cost can be reduced.

In accordance with the present disclosure, an example non-transitory computer readable medium may store instructions that when executed cause a computing device to dispense, using a first fluid ejector of a microfluidic device, a biologic sample to a region of a substrate, dispense, using a second fluid ejector of the microfluidic device, a reagent to the region of the substrate, and dispense, using a third fluid ejector of the microfluidic device, a metabolic indicator to the region of the substrate, wherein the metabolic indicator provides a visual indication in response to reaction with the biologic sample.

The present invention relates to a highly sensitive wind speed sensor and test equipment, including an air duct, a thin-film thermoelectric device, a temperature control hot plate, a boost noise reduction module and a data acquisition module. An installation hole for installing the thin-film thermoelectric device is provided on the air duct. The thin-film thermoelectric device is in surface contact connection with the temperature control hot plate. The thin-film thermoelectric device, the boost noise reduction module and the data acquisition module are connected in sequence. The side of the thin-film thermoelectric device in contact with the airflow to be measured in the air duct is the cold end, and the side in contact with the temperature control hot plate is the hot end. The included angle between the plane where the thin-film thermoelectric device is located and the airflow to be measured in the air duct is 0-90 degrees. Compared with the prior art, the present invention has the advantages of high sensitivity and the like.

In order to increase the efficiency with which an analysis using an enhanced electric field based on a microstructure is made, an embodiment of the present disclosure provides a plate-shaped sample liquid concentration device (10) that is to be used being placed over a microstructure substrate which has disposed on the surface thereof a microstructure capable of generating an enhanced electric field with respect to incident light. The sample liquid concentration device includes a first surface and a second surface that defines a thickness together with the first surface, and has formed therein a plurality of passage parts connecting the first surface and the second surface. The passage parts each have a first opening and a second opening formed respectively in the first surface and the second surface and are each defined by an inner surface connecting the first opening and the second opening. With the first surface disposed in proximity to the surface of the microstructure substrate, the first opening can be positioned corresponding to the position of the microstructure. The second opening can receive a sample liquid that contains a detection target object.

This flow velocity measurement method comprises: a heating step (S102) for heating a part of a medium; a first optical measurement step (S101) for acquiring a first image of observation illumination light that has passed through the medium, at a first timing; a second optical measurement step (S103) for acquiring a second image of observation illumination light that has passed through the medium, at a second timing which is after the first timing and which is during or after execution of the heating step; a first refractive index distribution change calculation step (S104) for calculating first information pertaining to a change in refractive index distribution based on the heat distribution of the medium on the basis of the first image and the second image; and a flow velocity calculation step (S105) for calculating the flow velocity of the medium on the basis of the first information pertaining to the change in the refractive index distribution.

A microfluidic valve comprising an adhesive tape, an outlet disposed at one end of a first microfluidic channel, an inlet disposed at one end of a second microfluidic channel, wherein the inlet and the outlet are disposed in a proximity to each other, wherein the adhesive tape covers both the outlet and the inlet. A method of operating the microfluidic valve is also disclosed.

The present disclosure provides a method for measuring flow velocity distribution of groundwater using distributed optical fiber with active heating, comprising: setting and optimizing field test parameters; conducting a background temperature monitoring test; performing a line-source active heating distributed temperature measurement test, including conducting multiple rounds of heating tests; denoising the obtained thermal plume attenuation signal data of the groundwater; and fitting the groundwater velocity-depth curve in the borehole by monitoring and analyzing the temperature difference signal between the internal temperature and the external temperature of the composite heating optical cable in a single depth section of the borehole, thereby obtaining a distributed groundwater velocity data set. The method of the present disclosure solves the problem that the existing groundwater flow velocity measurement technology cannot simultaneously conduct continuous and distributed measurements, improves the efficiency of groundwater velocity measurement, and it can avoid groundwater contamination during the measurement process.

The present invention discloses a microfluidic bio-interconnected neural network chip and a preparation method thereof. The chip consists of a microelectrode array, a microfluidic structure, and a cell culture ring structure. The microelectrode array can detect and stimulate the activity of neurons; the microfluidic structure limits the growth direction of axons between cell culture partitions by setting cell culture partitions, microfluidic channel dimensions, microfluidic channel shapes, and fillet distribution, thereby achieving controllable low-power transmission of neuronal electrical information; the cell culture ring structure provides nutrients for cells in the cell culture chamber. The present invention provides a method for manufacturing a microfluidic bio-interconnected neural network chip, using fully exposed positive photoresist as a sacrificial layer for microfluidic structure peeling, thereby solving the problem of difficult demolding of thin-film microfluidic structures. The chip can be used to explore the response characteristics of neuronal networks to external stimuli, study the internal information transmission mode of neuronal networks, and other fields.