55results about How to "The detection signal is accurate" patented technology

A defect detection method is used to generate a disc defect signal while recording or reproducing information recorded onto an optical disc. The method compares the difference between a reflected light intensity signal (SBAD) and a low-pass filtered SBAD with a predetermined level. A defect signal is generated during a period when the difference exceeds a predetermined value. The defect signal opens a switch to hold the low-passed signal of the SBAD and disconnects the low-pass filter from the SBAD at the moment a defect signal occurs. The held value of the low-passed signal effectively replaces the low-passed signal until the difference between the SBAD and held low-passed signal returns to within the predetermined limits, which re-closes the switch re-connecting the low-pass filter to the SBAD.

The invention provides a preparation method for a sodium chloride assisted silver nano-particle self-assembled filter paper surface enhanced Raman spectrum (SERS) base, and aims to solve the problems that the sensitivity of the silver nano-particle SERS base prepared by adopting an existing method is low and the manufacturing process is complicated. The preparation method comprises the following steps: 1, dissolving silver nitrate into ultrapure water and boiling; adding a sodium citrate solution to prepare silver sol; 2, immersing a filtering paper sheet in a sodium chloride solution; and airing the taken sheet; and 3, immersing the filtering paper sheet in the silver sol; and airing the taken sheet to finish the preparation of the surface enhanced Raman spectrum base. The surface enhanced Raman spectrum base provided by the invention can be used for rapidly detecting substances with the concentration in a ppb magnitude order and is high in sensitivity; the Raman spectrum base is simple and convenient to operate and low in cost; the prepared base can be applied to the detection field of inorganic molecules and biological molecules.

A load detecting device for a roller bearing includes: a strain gauge that is provided in a roller arranged rollably between a first bearing ring and a second bearing ring and that detects a load applied to the roller; a position detecting sensor that detects a rotation position of the roller in a revolution direction of the roller; and a data logger that is provided for the roller and that records and stores a detection signal from the stain gauge.

Provided are an artificial field source frequency domain electrical prospecting method and a prospecting system. A series of waveform current signals fed into the underground serve as artificial excitation sources, the frequency of the waveform current signals changes randomly, and the randomness of the frequency change of the waveform current signals is similar to the randomness of white noise. Simultaneously, waveforms of sent signals and waveforms of received signals are recorded synchronously. According to the principle of signal correlation, interference signals with correlation of the sent signals and the received signals as zero can be removed by means of the correlation of the sent signals and the received signals, information required by geological prospecting can be obtained, and the signal-to-noise ratio of geological prospecting signals and the resolution ratio of the geological prospecting are improved. The prospecting system applying the prospecting method mainly comprises a transmitter and a receiver, wherein the transmitter is used for transmitting random square-wave or bell-wave signals within a whole preset frequency range by one time, the receiver is used for receiving the random square-wave or bell-wave signals with geoelectric information transmitted by the transmitter, and a global position system (GPS) is utilized to perform synchronous control between the transmitter and the receiver. The artificial field source frequency domain electrical prospecting method and the prospecting system are suitable for prospecting of China's multiple mountain mineral deposits.

The invention discloses a display method, device and system of target detected signals. The method includes the steps that the target detected signals on the sea are acquired and come from a radar sensor and a photoelectric sensor; different types of acquired target detected signals are converted into uniform track identification according to a preset rule; the uniform track identification is used for displaying the target detected signals on a terminal. Due to the display method, device and system of the target detected signals, the problems that in the prior art, a radar monitoring system is low in working efficiency and poor in accuracy are solved, various target information can be processed and displayed, the monitoring process is visual, and the detected signals simultaneously obtained through the radar sensor and the photoelectric sensor in a detection mode are more accurate.

Disclosed herein are a signal-multiplexing apparatus and method based on machine learning. The signal-multiplexing method based on machine learning, performed by a signal-multiplexing apparatus based on machine learning, including training a transmitted signal using a machine-learning technique, performing complex mapping to transmit the transmitted signal as multiple signals, receiving the multiple signals and regularizing the multiple signals based on a preset rule corresponding to the machine-learning technique, outputting an estimated value for the transmitted signal by training regularized multiple signals using the machine-learning technique, calculating a difference between the transmitted signal and the estimated value for the transmitted signal, and detecting the transmitted signal from an output value when the difference is less than or equal to a preset value.

A light detecting apparatus includes: a first photoelectric conversion element unit (110) and a second photoelectric conversion element unit(120) each of which converts input light to an electric current and output it; an optical current transducer unit (100) for outputting, as a detected current, a differential current between an electric current outputted by the first photoelectric conversion element unit and an electric current outputted by the second photoelectric conversion element unit; and a first current/voltage converting unit (200) for amplifying the detected current outputted from the optical current transducer unit, converting it to a voltage signal, and outputting the voltage signal.

The invention discloses a stability evaluation method of a multi-channel spectrum system and a pretreatment optimization method. The stability evaluation method is characterized in that stability evaluation indexes are obtained by calculating the dynamic absorbance matrix and the dynamic deviation spectrum of a sample. The pretreatment optimization method comprises the following steps: establishing a pretreatment method database; calculating stability evaluation indexes of original spectrums and correction spectrums corresponding to various pretreatment methods; respectively establishing PLS-based location and prediction models for the original spectrums and the correction spectrums; calculating to obtain errors and correlation between near-infrared predicted values and measured values; finally, determining an optimal pretreatment method for follow-up detection of a near-infrared spectrograph according to the stability evaluation indexes, the errors and the correlation. According to the invention, the integral stability of a system is objectively evaluated, the optimal pretreatment method is selected for follow-up detection of the near-infrared spectrograph, so that detected signals are more accurate, and the method has very important values to development of a low-cost near-infrared instrument and large-scale application of the near-infrared technique.

The invention discloses a thickness detecting probe for a wheel type pipeline detector. The thickness detecting probe is designed for precisely detecting the wall thickness of a pipeline. A thickness detecting wheel, supporting wheels, a sliding ring seat and end covers of the thickness detecting probe are connected to supporting arms connected with a detector frame through a shaft, and run together in the pipeline along with the detector. The sliding ring seat is fixed in the end covers, and rotates along with the thickness detecting wheel and the supporting wheels, and sliding rings are fixed in the sliding ring seat, and are in close contact with carbon brush devices. Ultrasonic probe bodies are arranged in the thickness detecting wheel and used for achieving sound field coupling between the ultrasonic probe bodies and the pipe wall. Metal blocks are embedded in the supporting wheels, the metal blocks and a proximity switch on the supporting arms act together, and ultrasonic signals are excited to be generated. The probe is suitable for being used for pipeline deformation, corrosion and crack detectors, the length of the supporting arms is adjustable, the supporting arms and the detector can be integrated conveniently, the probe can be suitable for requirements for detection of pipelines of different calibers, it is guaranteed that detection signals are precise, lasting and stable, supporting performance is good, adaptability, impact resistance and abrasion resistance are high, and the service life is long.

A controller for an electric motor system is provided. The electric motor system includes a DC power supply, a power converter, a smoothing capacitor, a three-phase AC motor, and a current sensor. The controller includes an electronic control unit. The electronic control unit is configured to control the power converter such that an inter-terminal voltage of the smoothing capacitor matches a first reference value. The first reference value is a value which is determined as the inter-terminal voltage of the smoothing capacitor when a phase current is equal to a second reference value. The electronic control unit is configured to correct a detection value of the current sensor so as to decrease a difference between the detection value and the second reference value when the inter-terminal voltage matches the first reference value and the detection value does not match the second reference value.

An optical disc reproducing apparatus includes an analog-to-digital (A/D) converter which converts an analog signal obtained from an optical disc to a digital signal; an asymmetry compensator which detects and corrects an offset of the digital signal; a phase locked loop (PLL) which estimates a clock of the digital signal and compensates for a frequency error; a binary module which converts the digital signal to binary data; an equalizer which equalizes a particular frequency of the digital signal; and a channel identifier which detects a reference level of the binary module, based on an input signal of the equalizer.

The invention discloses an operating room nursing venous transfusion leakproof device and a control method thereof. The operating room nursing venous transfusion leakproof device comprises a gravity sensor, an alarm unit, a sensor detecting unit, an electromagnetic valve unit and a controller. The control method of the operating room nursing venous transfusion leakproof device comprises setting a pressure and temperature critical value of the controller; according to the pressure and temperature critical value, determining a maximum processible pressure and temperature capacity; according to collecting platform power management technology, combining a plurality of first work tasks into a first continuous work task; determining whether the first pressure and temperature capacity of the first continuous work task is larger than the maximum processible pressure and temperature capacity to achieve control of the entire operating room nursing venous transfusion leakproof device. The operating room nursing venous transfusion leakproof device and the control method thereof can ensure the nursing operation quality and avoid medical negligence and are high in accuracy, simple in structure and convenient to operate.

The invention discloses a double-ratio type hemicyanine dye molecule as well as a synthesis method and application thereof. According to the double-ratio near-infrared fluorescence and photoacoustic diagnosis and treatment dye molecule provided by the invention, the nitroreductase level directly related to the tumor treatment effect is visualized, quantified and evaluated, and the tumor hypoxia level is noninvasively monitored in real time through ratio near-infrared fluorescence and photoacoustic imaging so as to carry out prognosis and treatment evaluation; and the dye molecule BS-Cy-NO2 has a good photo-thermal effect and can be used for photo-thermal therapy of tumors. The dye molecule is simple in synthesis step, convenient to purify and excellent in imaging, and has a wide application prospect as a molecular diagnosis and treatment agent for double-ratio near-infrared fluorescence and photoacoustic imaging. The molecular structural formula of the dye is shown in the specification.

The invention discloses an approach switch and a horizontal garbage compressor with the approach switch. The approach switch comprises a sensor (20), a switch base (30), and a contacting rod (10) which is used for contacting with the switch base (30), wherein the switch base (30) is provided with a contacting face (31) which is used for contacting with the contacting rod (10), a through hole (32) is formed in the contacting face (31), and the sensor (20) is installed inside the switch base (30) and is directed at the through hole (32). Besides, the contacting rod (10) comprises an installing seat (12), a contacting piece (11) which is used for contacting with the contacting face (31), a support (14) which is used for installing the contacting piece (11), and a clip (13) which is used for connecting the installing seat (12) and the support (14). The clip can enable the contacting piece to be pressed on the contacting face from beginning to end so as to ensure contact of the contacting piece and the contacting face, and therefore the distance between the contacting piece and the sensor is limited, the sensor is protected from collision, and the sensor can detect signals precisely can be guaranteed.

The invention discloses a remote temperature monitoring system based on an amplitude stabilizing circuit. The remote temperature monitoring system based on the amplitude stabilizing circuit is characterized by mainly comprising a micro-controller, a GPRS wireless transmission module, a signal transmission processing module, an analog-to-digital conversion module, an amplitude stabilizing circuit,a temperature sensor and a mobile terminal; the GPRS wireless transmission module and the signal transmission processing module are separately connected with the micro-controller; the analog-to-digital conversion module is connected with the signal transmission processing module; the amplitude stabilizing circuit is connected with the analog-to-digital conversion module; the temperature sensor isconnected with the amplitude stabilizing circuit; and the mobile terminal is connected with the GPRS wireless transmission module through a wireless network. The signal transmission processing modulecan filter low-frequency interference signals and high-frequency interference signals in detection signals; influence of the interference signals is eliminated; therefore, the detection signals transmitted to the mobile terminal through the wireless network are relatively accurate; furthermore, the detection signals are amplified; the strength of the detection signals is improved; therefore, weakening of the detection signals due to long-distance transmission is made up; and thus, the temperature monitoring precision is increased.

The invention relates to a probe circuit of a water pump controller. The circuit includes a power source, and the power source is electrically connected with a low probe, a middle probe and a high probe; pressure sensors are arranged on the low probe, the middle probe and the high probe; the low probe is electrically connected with a low water-level detection circuit for detecting the water level,the middle probe and the high probe are electrically connected with a high water level detection circuit for detecting the water level, and the probe circuit further includes an anti-interference circuit, an optical coupler insulating circuit and a half-wave rectifying circuit; the anti-interference circuit, a signal amplifying circuit, the optical coupler insulating circuit and the half-wave rectifying circuit are electrically connected with the low probe, the middle probe and the high probe respectively. The circuit is reasonable in design, relatively simple in structure, high in anti-interference capability and accurate in signal detection.

The invention discloses a pulse ignition circuit based on Buck principle and a gas wall-hanging furnace. The pulse ignition circuit comprises an ignition module, a flame detection module and a controller, wherein the flame detection module comprises a pulse and fire detection unit and a signal conversion module which are connected with the output end of the ignition module in sequence, and the signal conversion module is used for converting an analog signal output by the pulse and fire detection unit. A comparator is adopted to output a flame parameter signal, the I/U port connected with a flame detection signal is changed from an analog (AD) detection port to a normal detection port, and the detection signal is more accurate. Only high and low levels are arranged at a chip detection portreceiving the flame detection signal. As only the high and low levels are arranged at a flame detection end, the difficulty of hardware design and software programming is greatly reduced.