6results about How to "Inhibit temperature drift" patented technology

The invention discloses a bandage type rigid-flexible composite matrix humidity detection instrument and a monitoring method thereof, and belongs to the technical field of humidity monitoring. The flexible bandage comprises a flexible bandage body, a sensing matrix, a split type signal processing unit and a visualization unit. The flexible bandage main body is of a rigid-flexible composite structure formed by a flexible substrate and a rigid island, and a sensing unit is integrated on the rigid island; the sensing unit comprises a coplanar micro-cavity humidity sensitive capacitor and an embedded temperature sensor; the plurality of sensing units are arranged on the bandage in a matrix manner to form a sensing matrix; the split type signal processing unit is of a split type structure and is connected with the sensing matrix through a high-temperature-resistant cable. According to the invention, a rigid-flexible composite bandage structure is adopted and can be tightly attached to different curved surfaces, so that planar and multi-point humidity distribution monitoring is realized; through a matrix sensing unit and integrated temperature compensation, the measurement precision and stability in a complex temperature change environment are significantly improved, and the system has on-site and remote double visual feedback capability.

The application relates to a dual-output bandgap reference circuit suitable for a differential reference source of an analog-to-digital converter and belonging to the technical field of analog integrated circuits. The dual-output bandgap reference circuit comprises a starting circuit, a reference voltage generating circuit and a reference current generating circuit. The starting circuit adopts an inverter structure, is turned on and injects an initial starting current when a power supply is powered on, so that the core bandgap reference circuit is separated from a lockout and normally works; and the starting circuit is automatically turned off after the reference voltage is stabilized. The principle of the reference voltage generating circuit is that a positive temperature coefficient output current and a negative temperature coefficient output current are linearly superposed to generate a reference current irrelevant to temperature, and a reference voltage is generated through a resistor. The reference current generating circuit couples the reference voltage to both ends of a transistor through an operational amplifier, generates an intermediate current with the same temperature characteristic as the reference voltage, and then outputs the reference current through a current mirror in proportion, so that the reference current is obtained. The application effectively improves the output precision and stability of the reference voltage and the reference current.

The invention discloses a power distribution equipment temperature monitoring method and system based on a passive wireless temperature sensor. The method comprises the following steps: carrying out credibility cutting on a temperature frame sequence sent by the passive wireless temperature sensor according to communication quality; for the temperature data frame subjected to credibility cutting, selecting a child window with a complete key frame and a consistent frame sequence; according to the key frame of the selected sub-window, calculating the temperature co-location difference and the temperature local gradient, and correcting the temperature value of the temperature sampling point of each sub-window so as to overcome the temperature drift caused by the passive wireless temperature sensor and the environmental influence; and splicing the corrected temperature values of the temperature sampling points of the sub-windows and then outputting the spliced temperature values. The invention aims to solve the problems of channel conflict and communication link disturbance between the existing passive wireless temperature sensors and improve the accuracy of temperature detection of the power distribution equipment.

The utility model relates to a quartz resonant type micro force sensing signal processing circuit, include: input port processing circuit is used for receiving the resonant signal of micro force sensor output, frequency signal processing circuit is used for converting the resonant signal to intermediate frequency signal and carries out analog shaping, and output processing signal, frequency solution circuit is used for extracting the base frequency signal in processing signal, first memory is used for storing frequency division coefficient and frequency multiplication coefficient, reconfigurable frequency divider is used for generating the frequency division signal of base frequency signal based on frequency division coefficient, digital frequency multiplier is used for generating the frequency multiplication signal of base frequency signal according to frequency multiplication coefficient, the utility model can convert the tiny frequency offset of quartz resonator accurately into real -time digital frequency signal output, is applicable to static high accuracy or dynamic multi -parameter synchronous micro force precision measurement scene.

The invention discloses a thermal infrared imager constant-temperature purging protection system, which is characterized in that through the integrated design of a protective cover, a threading air passing pipe, a temperature sensor, a PLC (Programmable Logic Controller) and a regulating valve, the accurate constant-temperature control of a thermal imager and the efficient purging of a window are simultaneously realized by utilizing the same high-pressure air source, and a signal cable is synchronously cooled and protected. The system adopts a PID algorithm to dynamically adjust the opening degree of the valve, is combined with real-time monitoring of a human-computer interface, has the advantages of being high in integration level, low in operation and maintenance cost and high in measurement reliability, and is suitable for infrared detection application in high-temperature environments such as metallurgy and chemical engineering. High-pressure air flow is adjusted in real time through a PLC and a PID algorithm, the working environment temperature of the thermal imager is stabilized within a target range, temperature drift caused by high temperature is effectively avoided, and the temperature measurement precision and reliability are remarkably improved.

A temperature compensation method for MEMS accelerometers based on fuzzy neural networks is presented, belonging to the field of MEMS accelerometer temperature compensation technology. This method addresses the problems of existing MEMS accelerometer temperature compensation methods, such as missing optimization of algorithm antecedent parameters, insufficient compensation accuracy, and poor real-time performance. The method includes: constructing an FCM-T-S fuzzy neural network module; optimizing the network antecedent parameters using the FCM algorithm; updating the network consequent parameters using gradient descent; and then deploying the trained FCM-T-S fuzzy neural network module into the MEMS accelerometer temperature compensation system. A data acquisition module synchronously acquires the temperature output voltage and acceleration output voltage of the MEMS accelerometer. The FCM-T-S fuzzy neural network module outputs the compensated true acceleration based on the temperature and acceleration output voltages. Results: High-precision temperature compensation for MEMS accelerometers is achieved, improving their output accuracy and temperature stability.