12 results about "Thermal modulation" patented technology

The invention provides a mine complex environment methane monitoring instrument reliability evaluation method and system, belongs to the field of instrument detection, and solves the problems that an existing experiment mode breaks away from the complex environment of a real mine, evaluation standards are statically solidified, and the existing experiment mode is difficult to dynamically adapt to mine environment parameter space-time fluctuation characteristics. And accurate reliability evaluation cannot be provided for the mine complex environment methane monitoring instrument. The method comprises the following steps: carrying out alternating current thermal modulation on the catalytic methane sensing element, and constructing harmonic response mapping of a thermal driving signal and an output signal of the sensing element; performing phase-locked demodulation on the harmonic response under the condition of clean reference gas to obtain at least a second harmonic amplitude and a third harmonic amplitude to calculate a poisoning index; and continuously collecting a change curve of the poisoning index along with time under a set hydrogen sulfide exposure and cleaning recovery cycle working condition, and generating a poisoning index drift rate and an advance index so as to determine a gas interference item reliability evaluation conclusion of the monitoring instrument.

The utility model discloses a multi-frequency thermal modulation type thermal imaging calibration plate which comprises a thermal pattern layer which is of a replaceable structure, a thermal pattern of the thermal pattern layer is formed by laser etching of a low thermal inertia carrier, and a thermal radiation coating is coated on the thermal pattern; the thermal modulation layer is positioned below the thermal pattern layer and comprises a plurality of thermoelectric modulation units which are arranged in a matrix; the control module is connected with the thermoelectric modulation units and is used for controlling the heating frequency and power of the corresponding thermoelectric modulation units below the thermal patterns in the thermal pattern layer so as to realize multi-frequency dynamic thermal pattern output; the heat insulation layer is located below the heat modulation layer and used for preventing heat from being conducted downwards; the shell structure comprises a power interface, a heat dissipation structure and a communication interface. According to the utility model, multi-mode heat source simulation in the calibration process of the infrared camera can be realized; the dynamic thermal pattern can enhance the algorithm adaptability and improve the calibration precision; the device is adaptive to multi-band and multi-model infrared imaging equipment; the hot pattern is convenient to replace.

The utility model discloses a new energy vehicle power battery thermal runaway monitoring and identifying device which comprises an MEMS gas sensor module circuit which is composed of a plurality of MEMS gas sensors and used for detecting voltage response signals of power battery gas; the thermal modulation module circuit is connected with the MEMS gas sensor module circuit and is used for adjusting the input voltage of a heating layer in the MEMS gas sensor for thermal modulation; the WIFI main control module circuit is respectively connected with the MEMS gas sensor module circuit and the thermal modulation module circuit and is used for converting a voltage response signal detected by the MEMS gas sensor into a digital signal and controlling the thermal modulation module circuit to work; and the intelligent equipment is wirelessly connected with the WIFI main control module circuit and is used for sending an acquisition instruction to the WIFI main control module circuit, receiving voltage response digital signal data and displaying an analysis result after processing the data, so that the problems that the gas monitoring sensor is slow in response, the system is immature and the interaction is inconvenient are solved.

A biochemical activation system for converting plant jaggery sludge into a stabilized bioactive micronutrient phenol lattice complex, wherein the system comprises the following: a preconditioning unit constructed as an aeration vessel with an oxygen distribution grid in the lower interior of the vessel and configured to generate controlled micro-oxygen gradients by metered supply of oxygen-containing gas pulses to induce preliminary molecular relaxation of phenolic substrates; an enzymatic activation unit consisting of a thermally buffered, serpentine channel with successive microchannels dimensioned to maintain a laminar-oscillatory flow regime, the channel being configured to subject the herbal jaggery sludge to a transient enzymatic disturbance and a dielectrically regulated thermal shock to destabilize weakly associated phenolic aggregates; a thermal modulation unit with heat flow guide plates and a multi-zone temperature control unit controlled by an electronic processor, wherein the processor controls cyclic temperature transitions between a lower and a higher thermal state to induce reversible phenolic rearrangement and micronutrient mobility; a microbial exposure unit consisting of a radially distributed arrangement of microporous inoculation openings and an ultrafine dispersion turbine arranged to introduce nonspecific, broadband microbial populations in a uniformly suspended pattern without allowing uncontrolled fermentation; and a lattice stabilization unit consisting of an ion-selective chamber with electrocohesion plates for generating pulsed electric fields, wherein the chamber is further equipped with a controlled humidity environment maintained between thirty and fifty-five percent relative humidity to induce structural coupling between micronutrients and phenolic compounds and to form a stabilized micronutrient-phenol lattice complex that is resistant to oxidative degradation and suitable for delayed rumen release.

This disclosure provides a thermo-optical phase modulation device and an optical phase modulator. The thermo-optical phase modulation device includes: a substrate; an isolation layer disposed on the substrate; an integrated waveguide structure disposed on the side of the isolation layer away from the substrate, including a first waveguide and a second waveguide, the first waveguide being disposed on the side of the isolation layer away from the substrate, the second waveguide being disposed on the side of the first waveguide away from the substrate, and the projection of the second waveguide along a first direction Z being located above the first waveguide; and a cover layer disposed on the side of the first waveguide away from the isolation layer and covering the integrated waveguide structure. The first waveguide has a first refractive index, the second waveguide has a second refractive index, and the first refractive index is different from the second refractive index. The technical solution of the embodiments of this disclosure can achieve optimized configuration of the function of the thermo-optical phase modulation device, especially improving the thermal modulation efficiency of the thermo-optical phase modulation device.

The invention provides a tension measuring method based on double-excitation laser pulse photoacoustic imaging. The tension measuring method comprises the following steps: applying macroscopic tension with controllable magnitude to a sample to be measured; the time delay between the two laser pulses is accurately controlled; two laser pulses are emitted to a detected area of the sample, the first laser pulse is a pre-modulation pulse so as to carry out local thermal modulation on the area, the second laser pulse is a detection pulse, and the laser pulses are emitted after controlled delay so as to excite a photoacoustic signal; respectively collecting photoacoustic signals excited by the detection pulse when the pre-modulation pulse action exists and when the pre-modulation pulse action does not exist, and calculating a difference value of the two beams of photoacoustic signals to obtain a nonlinear response signal; systematically adjusting the time delay, collecting a corresponding nonlinear response signal, obtaining a dynamic curve of the nonlinear response signal along with the time delay, and fitting the dynamic curve to a relaxation dynamic model; solving a nonlinear strength coefficient from a fitting result as a characteristic parameter, wherein the characteristic parameter is linearly associated with the macroscopic pulling force; based on the linear incidence relation, quantitative characterization of the tension state of the to-be-tested sample is achieved.

This invention discloses an eddy current damping thermally modulated superelastic shape memory alloy sliding vibration isolation device and its application. The device includes a support top / bottom plate, permanent magnet assemblies, SMA cables, thermal springs, sliders, and SMA cable fixing devices. A cavity is located at the center of the bottom of the support top plate, within which a slider is hinged. Several rings of permanent magnet assemblies are arranged circumferentially around the cavity at the bottom of the top plate. SMA cable fixing devices are arranged around the perimeter of the bottom of the top plate. The support bottom plate is assembled and fixed by an upper copper plate and a lower steel plate. Grooves are symmetrically formed on the lower surface of the copper plate and the upper surface of the steel plate, and SMA cables are arranged within these grooves. The SMA cables are composed of multiple SMA wires interwoven with thermal springs. This invention achieves real-time thermal modulation of the superelastic properties of the SMA cables through eddy current damping, and simultaneously utilizes combined eddy current damping and friction damping to achieve composite damping energy dissipation, significantly improving the self-resetting capability and vibration isolation control effect of the vibration isolation device under low-temperature service conditions.

The present disclosure provides a thermo-optic phase modulation apparatus and an optical phase modulator. The thermo-optic phase modulation apparatus comprises: a substrate; an isolation layer disposed on the substrate; an integrated waveguide structure disposed on a side of the isolation layer facing away from the substrate, and comprising a first waveguide and a second waveguide, the first waveguide being disposed on the side of the isolation layer facing away from the substrate, the second waveguide being disposed on a side of the first waveguide facing away from the substrate, and a projection of the second waveguide in a first direction Z being located above the first waveguide; and a cladding layer disposed on a side of the first waveguide facing away from the isolation layer and covering the integrated waveguide structure. The first waveguide has a first refractive index, the second waveguide has a second refractive index, and the first refractive index is different from the second refractive index. The technical solution of the embodiments of the present disclosure enables an optimized configuration of thermo-optic phase modulation apparatus functions, and in particular improves thermal modulation efficiency of thermo-optic phase modulation apparatuses.

A multi-bottle thermal modulation assembly that has a housing defining a chamber and a plurality of housing channels each spanning into the chamber for receiving a bottle, a plurality of heating coils each surrounding one of the plurality of housing channels in a helical configuration and operably configured to have a warming mode configured to generate an ambient temperature in a range of 100-350° F., a mechanical refrigeration unit operably configured to have a cooling mode configured to generate a temperature within the chamber in a range of 32-40° F., and a controller communicatively coupled each of the plurality of heating coils and the mechanical refrigeration unit and operably configured to selectively cause the warming mode of one of the plurality of heating coils while the mechanical refrigeration unit is in the cooling mode.

The invention provides an intelligent monitoring and dynamic compensation method and system for a medium-voltage UPQC, and relates to the technical field of power systems and power electronics. The method comprises the following steps: establishing three-phase synchronous acquisition at an access point, and analyzing a disturbance type, severity, an event time window and a time reference to form monitoring evaluation; de-noising and state estimation are carried out under a unified time mark to form a voltage and current state quantity; short-term prediction is implemented according to the state quantity and evaluation, voltage feed-forward and current feed-forward are given, a cooperation margin is calculated in combination with direct-current link constraint, and voltage and current reference and amplitude limiting are generated; injection voltage is formed under voltage reference and amplitude limiting; the injection current is formed under current reference and amplitude limiting, and the injection current is converged into an event handling record and an operation record. A monitoring-prediction-forming link is run through under a unified time scale, direct current, electric quantity and thermal-modulation resources are uniformly constrained by a cooperative margin to realize allocation and amplitude limiting, and the traceability and quick disposal capability are maintained by assisting with feedforward and hierarchical defense.

This invention relates to the field of acoustic wave modulation, and proposes a thermoacoustic signal modulation system and method, including a thermoacoustic modulation device and a closed-loop feedback control circuit. The thermoacoustic modulation device includes a medium for propagating sound waves and a thermal modulation unit integrated on or near it. The thermal modulation unit has temperature-sensitive electrical characteristics, and its electrical parameters are functionally related to temperature. The closed-loop feedback control circuit is electrically connected to the thermal modulation unit, determines the current temperature state based on the real-time electrical parameters of the thermal modulation unit, and generates driving power applied to the thermal modulation unit when there is a deviation between the target control signal and the current temperature state. The closed-loop feedback control circuit applies transient overdrive power to the thermal modulation unit when the temperature deviates passively or actively from the target temperature, so as to quickly reach and lock the target temperature. This transforms temperature modulation from passive thermal relaxation to active control based on electrical feedback.

The invention discloses a thermal crosstalk prevention photon chip integrated with a micro-fluidic channel and a processing method of the thermal crosstalk prevention photon chip, and belongs to the technical field of integrated optoelectronic devices and optical communication. The thermal crosstalk prevention photon chip comprises a photon device, a metal electrode and the micro-fluidic channel; the photonic device comprises N optical waveguides which are subjected to thermal modulation and M optical waveguides which are not subjected to thermal modulation, the metal electrodes are arranged right above all the optical waveguides which are subjected to thermal modulation, and the metal electrodes and the corresponding optical waveguides which are subjected to thermal modulation form a group of thermal phase shifters; the micro-fluidic channel is arranged right below all the optical waveguides which are not thermally modulated; according to the method, a femtosecond laser direct writing technology and a femtosecond laser-assisted wet etching technology are combined, an optical waveguide device and a micro-fluidic cooling channel are constructed in a material with etching selectivity at the same time, and a hot electrode is deposited on the surface of a photon chip through a magnetron sputtering technology; the liquid flow in the microfluidic channel is utilized to take away redundant heat generated by the electrode, thermal crosstalk between devices in the photon chip can be remarkably reduced, the spatial selectivity and stability of the regulation and control process are improved, the integration capability and the working reliability of the photon chip are further enhanced, and the application prospect and the popularization value are good.