32results about How to "No signal distortion" patented technology

A symmetric optical modulator with low driving voltage, wherein polarization of any one of branched waveguides formed on a substrate is inverted, and the two branched waveguides are simultaneously controlled by a center electrode formed on a top portion thereof, thereby ensuring a low voltage driving and embodying a characteristic of there being no signal distortion due to chirp.

The invention relates to a radiation biological dosimeter, a preparation method and an application, and belongs to the field of biotechnology. The biological dosimeter is a SoxR radiation biological dosimeter formed by adding the EGFP gene downstream of the SoxR promoter of Escherichia coli or a Cda radiation biological dosimeter formed by adding the EGFP gene downstream of the Cda promoter of Escherichia coli. The radiation biological dosimeter can monitor the physical radiation dose in real time online, and has a wide range of detection and application; the group effect of microorganisms is used as a biological signal amplification system, and the sensitivity is greatly improved compared with the existing related detection technology; The above-mentioned radiation biological dosimeter is placed in the microfluidic chip for cultivation, which can realize online real-time monitoring, realize commercial production, is easy to carry, and can detect quickly. for reference.

The invention discloses a method for spreading spectrum, comprising the following steps: when a clock signal is detected, acquiring a modulation signal corresponding to the clock signal; and performing spectrum spreading on the clock signal according to the modulation signal, wherein adjacent The modulation signal corresponding to the clock signal is an inverted signal. The invention also discloses a chip, a display panel and a computer-readable storage medium. The present invention controls two independent voltage-controlled oscillators to reversely spread the frequency of two adjacent clock signals by using two modulation signals that are mutually inverse signals, so that the frequency-spreading interval of the clock signal increases and the signal is distorted. The degree of frequency remains unchanged, which solves the technical problem that the spread spectrum effect of the dual clock signal is poor.

The invention discloses a train on-board wireless communication device, and mainly aims to solve the problem that the network signal is poor, the communication quality is low and the Internet speed is low on trains. The train on-board wireless communication device comprises an antenna (1), a combiner module (2), a power divider module (3), an SIM card module (4), a USB module (5), an ATOMD525 core processor module (6), a SATA hard drive module (7), and a network module (8). The combiner module is connected with the antenna module and the power divider module in a two-way mode. The SIM card module is connected with the power divider module and the USB module in a two-way mode. The ATOMD525 core processor module is connected with the USB module, the SATA hard drive module and the network module in a two-way mode. The SIM card module is loaded with nine SIM cards of three major operators in order to increase the bandwidth. The speed of access to the Internet is improved, uninterrupted communication in the moving state of users is ensured, and the demand of train passengers for Internet access can be met.

The invention provides a radiation-proof inductance type rotating speed sensor and aims to provide a rotating speed sensor with convenient installation and dismounting, safe and realiable working, high conversion precision and the avoidance of ray damage. The radiation-proof inductance type rotating speed sensor is realized through the following technical scheme: one end of a cable component is axially fixed to a control box through a plug component and a socket, the other end of the cable component is connected to a rotation number measurement probe, W is the critical air gap of the rotation number measurement probe as a working air gap, output is a critical inductance value Ha of 4.85mH to 4.95mH, the measured rotation number of fixed shaft rotation is reflected, the control box obtains the inductance signal of the measured rotation number by using a radiation resistant cable, the signal is transmitted to the detection circuit through the cable component, and the detection circuit distinguishes the inductance signal according to a conversion critical point. When the inductance value H is larger than or equal to Ha, the signal is converted into a low level signal through a level conversion circuit, otherwise the signal is converted into a high level signal. A frequency measurement circuit counts electric impluses through a microprocessor, the converted frequency number is changed as a rotation speed to be outputted from an output interface.

The application discloses a photodetector and its use method, which relate to the field of optical communication integrated devices. The photodetector includes: an incident waveguide for propagating signal light; a germanium absorption region on the silicon layer, which is used for detecting signal light, and convert the signal light into an electrical signal; the focusing device is used to focus the signal light incident on the waveguide to the silicon layer directly below the germanium absorption region, and the beam converged when the signal light passes through the focusing device and reaches the incident end of the germanium absorption region The width is greater than the width of the germanium absorption region. The usage method includes: the signal light enters the focusing device from the incident waveguide; the focusing device focuses the signal light to the silicon layer directly below the germanium absorption region, and makes the width of the converged light beam when the signal light reaches the incident end of the germanium absorption region larger than that of the germanium absorption region. The width of the absorption region; the germanium absorption region converts the signal light into an electrical signal. This application can not only improve the saturated absorption power of the photodetector, so that no signal distortion occurs during photoelectric conversion, but also improve the responsivity of the device.

The invention discloses a weak reflection fiber Bragg grating for demodulation by using square wave and B-spline wavelet. It includes the following steps, step 1: generating a double-wave signal from a digital signal generator to drive the acousto-optic modulator, so that the continuous single-frequency laser is converted into a double-wave laser; step 2: weakly reflecting fiber Bragg grating reflects the double-wave laser, step 3: The photodetector receives the light intensity signal; step 4: extracting the interference eigenvalues ​​in the interference interval under the double-wave signal of multiple consecutive cycles, to form an interference intensity signal; step 5: performing B-spline wavelet noise reduction processing on the interference intensity signal; step Step 6: Perform Hilbert transform on the interference intensity signal after noise reduction; Step 7: Perform arctangent operation on the ratio of the interference intensity signal and the phase-shifted signal, and finally obtain the interference phase signal to reflect the external vibration signal. The invention has the advantages of being able to obtain stable vibration signals, simple in structure and small in calculation amount.

The invention discloses a method for detecting the thermal stability of polymer-bonded explosive. The method is characterized in that the thermal stability of micro-structures of the polymer-bonded explosive can be detected. The method includes steps of preparing platy PBX (polymer-bonded explosive) samples from the formed PBX; carrying out in-situ variable-temperature neutron or X-photon small-angle scattering experiments in appropriate q ranges to acquire temperature-dependent variation curves of scattered neutron or X-photon counting rates; analyzing temperature-dependent relative and absolute variation of the scattered neutron or X-photon counting rates to judge the thermal stability characteristics of the micro-structures of the PBX. The method has the advantages that the influence offew relative integral micro-structures in the PBX on the thermal stability can be detected by the aid of the method, and the method is an effective method for detecting the thermal stability of micro-structures of complicated multi-component PBX materials; temperature-dependent variation, which is given by the aid of the method, of the scattered neutron or X-photon counting rates is an importantfoundation for intensive research on 'structure-function' relationships between the thermal stability and different types of macroscopic performance of the microscopic structures of the PBX.