40results about How to "Low detection threshold" patented technology

A control system (10) for a vehicle (16) includes a sensor (35-47) that generates a sensor signal and a stability control system (26). Tire monitoring sensors (20) in each wheel generate tire signals including temperature, pressure and acceleration. The controller (26) is coupled to the sensors (20, 25-47), and generates a first roll condition signal as a function of the sensor signal, and generates a second roll condition signal as a function of the tire signals. The first or second roll condition signals control the rollover control system to mitigate a vehicle rollover event.

A control system (10) for a vehicle (16) includes a sensor (35-47) that generates a sensor signal and a stability control system (26). Tire monitoring sensors (20) in each wheel generate tire signals including temperature, pressure and acceleration. The controller (26) is coupled to the sensors (20, 25-47), and generates a first roll condition signal as a function of the sensor signal, and generates a second roll condition signal as a function of the tire signals. The first or second roll condition signals control the rollover control system to mitigate a vehicle rollover event.

The invention discloses a composite accelerometer based on a capacitance effect and a tunnel effect. The composite accelerometer comprises a bonding substrate, a cushion liner frame body, a supporting frame body, a cantilever beam and a mass block. A tunnel point is arranged at the center of the lower surface of the mass block. The composite accelerometer based on the capacitance effect and the tunnel effect has the advantages of adopting the manner of integrating capacitance detection and tunnel effect detection and detecting a capacitor and a tunnel. Detection of a low detection threshold value, a wide range and high sensitivity of an acceleration speed is achieved. Meanwhile, accurate measurement of the acceleration speed of a known acceleration speed value circumstance is carried out. The integrated design is adopted and the composite accelerometer is reasonable in structure, high in sensitivity, simple in detection circuit, convenient to use, good in reliability and suitable for microminiaturization.

Embodiments of the invention relate to the technical field of wireless communication, in particular to a mobile device and a method for adjusting a physical sign information detection threshold, and solve the problem that the situation that user safety verification cannot be passed easily occurs due to relatively numerous factors influencing verification passing in the prior art. According to the embodiments of the mobile device and the method, when a user is subjected to physical sign information verification, if a target distance between a wearable device bound with the mobile device and the mobile device is smaller than a set distance threshold, the physical sign information detection threshold corresponding to physical sign information is reduced. Whether the physical sign information detection threshold is reduced or not is judged according to the distance between the wearable device bound with the mobile device and the mobile device, so that if the physical sign information detection threshold is reduced, on the premise of not lowering the safety, the verification passing probability can be increased, and the situation that the user safety verification cannot be passed can be reduced.

A device and method for optically examining the interior of turbid media including acts of spatially separating a plurality of wavelength bands contained in a broad-band light; separately modulating the plurality of wavelength bands; recombining the plurality of modulated wavelength bands to a beam of spectrally encoded broad-band light; illuminating a turbid medium with the beam of spectrally encoded broad-band light; detecting light emanating from the turbid medium with a detector and demodulating the detected light with a demodulator to provide spectroscopic information.

The invention provides a laser radar, a laser radar system for reducing an ambient light interference and a detection method thereof. The laser radar system integrates all portions. The laser radar system for reducing the ambient light interference comprises an ambient light collection module and a management module. The ambient light collection module collects an electrical signal related to surrounding ambient light intensity of a target object. The management module comprises an analysis module and a control module. The analysis module is connected to the ambient light collection module andthe control module in a communication connection mode, wherein the analysis module of the management module analyzes the acquired electrical signal and generates a control signal which is related tothe control of the laser radar. The control module controls a laser emitting end and / or a laser receiving end of the laser radar according to the control signal.

An intrinsically safe, precise, and cost effective storage tank leak detection system. Embodiments include a highly precise quartz crystal type pressure transducer, secured in a vacuum and held at a constant temperature. Said transducer is used in combination with data correction and regression techniques to yield a storage tank leak detection system with an extremely low leak detection threshold. The storage tank leak detection system is thought to be most useful for detecting very small leaks in very large storage tanks.

A safe, precise, and cost effective storage tank leak detection system. Embodiments include two highly precise quartz crystal type pressure transducers held at a constant temperature. A bubbler to achieve access to the hydrostatic pressure at the tank bottom and just below the liquid surface. First transducer and bubbler are used to measure fluid mass while second transducer and bubbler are used to measure fluid density then used in combination with data correction and regression techniques to yield a storage tank leak detection system for use in horizontal cylindrically shaped tanks with an extremely low leak detection threshold. The storage tank leak detection system is thought to be most useful for detecting and measuring very small leaks in large horizontal cylindrical storage tanks.

A method for optically examining the interior of turbid media is provided. The method comprises the steps: providing broad-band light (2); spatially separating a plurality of wavelength bands (2a, 2b, . . . , 2n) contained in the broad-band light; separately modulating the plurality of wavelength bands (2a, 2b, . . . , 2n); recombining the plurality of modulated wavelength bands to a beam (11) of spectrally encoded broad-band light; illuminating a turbid medium (8) with the beam (11) of spectrally encoded broad-band light; detecting light emanating from the turbid medium (8) with a detector (9) and demodulating the detected light with a demodulator (10) to provide spectroscopic information.

An intrinsically safe, precise, and cost effective storage tank leak detection system. Embodiments include a highly precise quartz crystal type pressure transducer, secured in a vacuum and held at a constant temperature. Said transducer is used in combination with data correction and regression techniques to yield a storage tank leak detection system with an extremely low leak detection threshold. The storage tank leak detection system is thought to be most useful for detecting very small leaks in very large storage tanks, most likely above ground storage tanks.

Gray-tone lithography technology is used in combination with a reactive plasma etching operation in the fabrication method and system of a thick semiconductor drift detector. The thick semiconductor drift detector is based on a trench array, where the trenches in the trench array penetrate the bulk with different depths. These trenches form an electrode. By applying different electric potentials to the trenches in the trench array, the silicon between neighboring trenches fully depletes. Furthermore, the applied potentials cause a drifting field for generated charge carriers, which are directed towards a collecting electrode.

The invention provides a high-frequency radar target joint detection method using time-frequency analysis and a constant false alarm technology. Firstly, radar echo signals are preprocessed to conveniently extract a time-frequency ridge. The preprocessing process comprises the following steps: performing time-frequency representation on radar echo signals, performing binarization processing, performing vertical projection on a binary image, determining an approximate time-frequency ridge extraction area, and extracting the time-frequency ridge. After the time-frequency ridge is obtained, a CFAR detector is used for carrying out first-stage detection on time-frequency points on the time-frequency ridge, whether the time-frequency points on the time-frequency ridge are target points or not is judged, then the number of the target points is accumulated, second-stage detection is carried out, and if the accumulation number reaches a second threshold value set by a binary accumulation algorithm, it is judged that the time-frequency ridge is a ship target. Verification is carried out through actual radar data and AIS information, and under the condition of the same false alarm rate, a union set of ship targets matched by TF-CFAR and CFAR methods is taken, so that the radar target matching number can be greatly improved, and the radar target detection probability is further improved.

A storage tank leak detection system, including a quartz crystal type pressure transducer held at a constant temperature, a bubbler-based pressure sensor for reporting tank bottom pressure measurements to the transducer, a fluid surface measurement apparatus to report liquid surface pressure to the transducer, atmospheric pressure measuring apparatus, and a computing system for, based on data reported by all components, effecting data correction (corrected for atmospheric and container physical variations during data gathering) and regression techniques to yield data indicative of changes, if any, in mass content of a liquid storage container, such as a surface storage tank for petroleum and other chemicals.

An intrinsically safe, precise, and cost effective storage tank leak detection system. Embodiments include a highly precise quartz crystal type pressure transducer, secured in a vacuum and held at a constant temperature. Said transducer is used in combination with data correction and regression techniques to yield a storage tank leak detection system with an extremely low leak detection threshold. The storage tank leak detection system is thought to be most useful for detecting very small leaks in very large storage tanks.

A method of operating an electromechanical actuator (6) for an awning with arms (1), comprising a control unit (8), stop detection means (9) and means (7) for measuring a parameter (Ucapa) of the actuator, the awning being able to move over its travel in at least a first (ZP1) and a second (ZP2, ZP3) positioning zone, the method comprising the following steps:upon detecting an initiating event, automatic determination, from the measurement of the parameter of the actuator, of the positioning zone in which the current position of the awning is located; andif the current position of the awning is located in the second positioning zone, temporary deactivation of the stop detection means for detecting a stop in the course of a movement of the awning towards a stop position.

The invention discloses a preparation detection method of an adsorbent based on leaked PX in soil. The preparation detection method utilizes a thermogravimetric analysis method to analyze and comprises the following steps: (1) exchanging a potassium chloride solution with a certain concentration and a 13X molecular sieve at a suitable temperature to obtain a high-potassium KX molecular sieve sample; (2) exchanging the high-potassium KX molecular sieve sample obtained by the step (1) and a barium chloride solution at a proper temperature to obtain a barium exchanged molecular sieve; (3) digesting the soil containing the leaked PX and sieving the soil by the barium exchanged molecular sieve, and determining the leaked PX amount of the molecular sieve in the soil by using the thermogravimetric analysis method. An exchanging environment is regulated and controlled by combining a magnetic environment with weak current and the adsorbent has a better continuing performance. The preparation detection method has the advantages of good adsorption effect, simplicity in operation, low cost, environmental friendliness, energy saving and emission reduction, low detection limit, good accuracy and the like, and has very good industrial production value and popularization and application value in the field of environment purification and detection.

The invention relates to a biosensor containing an allosteric transcription factor, and a kit and application of the same to micromolecular detection.

A storage tank leak detection system for detecting and measuring very small leaks in large horizontal cylindrical storage tanks. Embodiments include two highly precise quartz crystal type pressure transducers held at a constant temperature. A bubbler to achieve access to the hydrostatic pressure at the tank bottom and just below the liquid surface. First transducer and bubbler are used to measure fluid mass while second transducer and bubbler are used to measure fluid density then used in combination with data correction and regression techniques to yield a storage tank leak detection system for use in horizontal cylindrically shaped tanks with an extremely low leak detection threshold.

A storage tank leak detection system for detecting and measuring very small leaks in large horizontal cylindrical storage tanks. Embodiments include two highly precise quartz crystal type pressure transducers held at a constant temperature. A bubbler to achieve access to the hydrostatic pressure at the tank bottom and just below the liquid surface. First transducer and bubbler are used to measure fluid mass while second transducer and bubbler are used to measure fluid density then used in combination with data correction and regression techniques to yield a storage tank leak detection system for use in horizontal cylindrically shaped tanks with an extremely low leak detection threshold.

The present invention aims to provide an odorant for fuel gases for anion membrane fuel cells, which does not generate a harmful sulfur compound after combustion and does not deteriorate the performance of a fuel cell, while enabling leakage detection at low concentrations, and which enables detection of leakage of a gas by a means other than odor, for example, by visual observation. The odorant for fuel gases for anion membrane fuel cells, imparts a fuel gas with an odor, and is characterized in that the odorant contains at least one or more substances selected from the group consisting of ammonia, trimethylamine, triethylamine, N,N-diethylmethylamine, N,N-dipropylmethylamine, N,N-dipropylethylamine, N,N-diisopropylmethylamine, N,N-diisopropylethylamine, dimethylamine, diethylamine, dipropylamine, ethylmethylamine, propylmethylamine, propylethylamine, methylamine, ethylamine and propylamine.

The present invention relates to electronic devices for the high sensitivity and selectivity detection and identification of volatile compounds in a gaseous medium, as well as of dissolved compounds in aqueous solutions. The claimed integrated circuit is intended for detecting and identifying analytes in a multicomponent medium and comprises at least one first microfluidic channel integrated in at least part of the integrated circuit surface, at least one ion-selective transistor with a sensitive surface and a circuit for processing the transistor signals. Furthermore, the first microfluidic channel has an inner surface and an outer surface. At least part of the first microfluidic channel outer surface is made in the form of a porous hydrophobic membrane. Moreover, the sensitive surface of the ion-selective transistor is located in the first microfluidic channel under the porous hydrophobic membrane, and at least one sensitive surface pad of the said transistor is functionalized with at least one type of biological receptor for binding the analyte of interest. The present invention also relates to a device for detecting and identifying analytes in a multicomponent environment, comprising a substrate, the above-described integrated circuit located on top of the said substrate and an encapsulating layer on top of the integrated circuit. That said, at least one medium supply channel and at least the second microfluidic channel are located in the encapsulating layer in such a way that the second microfluidic channel is connected to the first microfluidic channel and the medium supply channel is located in the porous hydrophobic membrane region. The technical result achieved by the proposed invention implementation is to reduce the lower detection threshold of a «bioelectronic nose» or «bioelectronic tongue» type device, to increase its selectivity in the target compounds identification, to increase the system response rate and to reduce the analysis time in general.

The invention discloses a small fault detection method of a closed-loop control system of a sampling manipulator. The method comprises the following steps: designing an adaptive neural network controller of a discrete time manipulator; constructing a dynamic estimator to approximate the unknown dynamics of the system; The system dynamic residual and the residual compensated by the controller can further obtain the enhanced total measurable fault residual; calculate the weighted and recursive absolute fault residual cumulative value; The cumulative value is compared with the self-adaptive threshold, if there is a certain moment when the cumulative value of the fault residual is greater than the self-adaptive threshold, it is determined that the manipulator breaks down at this moment; the failure detection scheme of the present invention ensures that after the manipulator system breaks down, Realize rapid detection of faults, through the weighted recursive absolute residual accumulation mechanism, solve the problems of frequent fault changes and slow fault diagnosis speed, and ensure the safety and rapidity of the fault detection system.

A method (100; 200) for digital signal processing (S(t)) of a pulse and scanning radar during an observation of a coastal zone in land / sea detection mode, the signal being sampled according to a two-dimensional temporal map, a distance dimension (d) and a recurrence dimension (rec), comprising: selecting a digital terrain model file (MNT) of the observed coastal zone; transforming (110; 210) the temporal map and / or the digital terrain model file to obtain a transformed temporal map and / or a transformed digital terrain model file the data of which are expressed in a common reference frame; constructing (120) a mask (MT; MF) from the transformed digital terrain model file; and applying (130) the mask to the samples (E(d, rec); E(d, Δf)) of the map associated with the transformed temporal map, in such a way as to obtain filtered samples (Ef(d, rec); Ef(d, Δf)).

The invention discloses a small fault detection method of a sampling mechanical arm closed-loop control system. The method comprises the following steps: designing a self-adaptive neural network controller of a discrete time mechanical arm; constructing a dynamic estimator to approach the unknown dynamic state of the system; calculating a system dynamic residual error caused by the fault and a residual error compensated by a controller, and further obtaining an enhanced total measurable fault residual error; calculating an absolute fault residual accumulated value of weighted recursion; and designing a fault detection decision scheme, comparing a fault residual accumulation value obtained through real-time calculation with a self-adaptive threshold value, and if a certain moment exists and the fault residual accumulation value is larger than the self-adaptive threshold value, judging that the mechanical arm breaks down at the moment. According to the fault detection scheme, it is guaranteed that after the mechanical arm system breaks down, rapid fault detection is achieved, the problems that the faults change frequently and the fault diagnosis speed is low are solved through an absolute residual accumulation mechanism of weighted recursion, and the safety and rapidity of the fault detection system are guaranteed.

The invention discloses a method and kit for high throughput testing of enzymatic activity in lipase in a liquid milk product. The kit for testing of the enzymatic activity in the lipase in the liquid milk product comprises a reagent 1 and a reagent 2 which are independently packaged. The reagent 1 is a glycine-sodium hydroxide buffer solution, the pH value of the reagent 1 is 8.0-10.0, and the reagent 2 is an acetonitrile solution of p-nitrophenyl ester. The method is used for testing the enzymatic activity in the lipase in the liquid milk product through the kit, theoretical basis is provided for classification of raw milk, and fresh and raw milk quality control indexes suitable for producing and processing various kinds of liquid milk can be formulated, such as predicting UHT milk shelf life, scientifically guiding UHT product partition selling, lowering product metamorphism caused by residual lipase activity and protecting enterprise benefits and consumer benefits. The testing method is high in sensitivity, and the detection threshold value of lipase is low.

The invention discloses a lever-type bidirectional surface acoustic wave acceleration sensor. The lever-type bidirectional surface acoustic wave acceleration sensor comprises a metal shell, a movablebearing, a rigid lever, an inertia mass block, two pressure transmission rods and two surface acoustic wave sensor devices; the movable bearing is fixed in the center of the top surface of the metal shell; one end of the rigid lever is fixedly connected with the movable bearing, and the other end of the rigid lever is connected with the inertia mass block; the surface acoustic wave sensor devicesare both connected with the metal shell and are symmetric relative to the rigid lever; and one end of each pressure transmitting rod is vertically and fixedly connected with the rigid lever, and the other end of each pressure transmitting rod contacts with the corresponding surface acoustic wave sensor device. With the sensor disclosed by the invention adopted, defects such as the poor structuralstability, short service life, axial deformation of a cantilever beam are avoided; a force to be tested is increased according to a lever principle, and therefore, the structure sensitivity of the sensor is high, the detection threshold value of the sensor is low; and an acceleration direction can be detected. The sensor is convenient to install, high in detection precision, and has a bright application prospect.