8results about How to "Maintain measurement accuracy" patented technology

The embodiment of the invention provides a temperature sensing method, a temperature sensor, a vehicle and a computer program product. The method is applied to the temperature sensor comprising a first resistor and a second resistor. The method comprises the following steps: respectively determining a first instantaneous resistance value change rate and a second instantaneous resistance value change rate of the first resistor and the second resistor at the current sampling moment under the condition of determining that the resistance value difference of the first resistor and the second resistor at the current sampling moment exceeds a preset difference value threshold value; determining a resistor of which the instantaneous resistance value change rate meets a preset requirement from the first resistor and the second resistor as a normal resistor; a temperature is sensed using the normal resistance. By introducing the two resistors and monitoring the instantaneous resistance value change rates of the two resistors, even if one resistor breaks down or is abnormal, the system can still recognize and utilize the other resistor which works normally to measure the temperature, and the reliability and the stability of the whole system are enhanced.

The invention belongs to the field of industrial automatic detection, and particularly relates to a high-precision sensor detection mechanism which comprises a sensor protection shaft, a high-precision distance measuring sensor, a guide shaft sleeve and a transition block. The sensor protection shaft is of a hollow shaft-shaped structure; the high-precision distance measuring sensor is fixedly arranged in an inner cavity of the sensor protection shaft in the axial direction, and a measuring head of the high-precision distance measuring sensor faces the lower end of the sensor protection shaft. The guide shaft sleeve is coaxially arranged at the lower part of the inner cavity of the sensor protection shaft, and the lower end surface of the guide shaft sleeve is flush with or basically flush with the lower end surface of the sensor protection shaft; the transition block is sleeved in the guide shaft sleeve in an axial sliding manner, the lower end face of the transition block extends out of the guide shaft sleeve and the lower end face of the sensor protection shaft, and a preset gap is formed between the upper end face of the transition block and the measuring head. The slidable transition block is used for replacing a sensor measuring head to directly contact with a measured surface, so that pollutants such as oil stain and dust are effectively isolated, and the measuring head is kept clean and the measuring precision is kept.

The invention relates to the field of material mechanical property testing, and provides an in-service material property detection system based on an indentation method, comprising: an excitation module for applying a composite dynamic excitation load to a pressure head when the spherical pressure head is pressed into a to-be-detected material; the signal acquisition module is used for synchronously acquiring a dynamic load signal and a dynamic displacement signal in the pressing-in process of the pressing head; the data processing module is used for calculating an instantaneous phase difference according to the dynamic load signal and the dynamic displacement signal, constructing an evolution curve of the instantaneous phase difference along with the change of the pressure depth, and extracting a first characteristic depth, a second characteristic depth and a phase hardening index from the evolution curve; and the performance resolving module is used for calculating the elastic modulus and the yield strength of the to-be-tested material according to the first characteristic depth, the second characteristic depth, the phase hardening index and the mapping relation model. According to the method, the plastic hardening constitutive relation of the material does not need to be preset, rapid and micro-damage detection of the tensile property of the material can be achieved through single-time micron-order pressing-in, and the method is particularly suitable for field evaluation of in-service equipment.

The invention discloses a soil surface water content multi-source remote sensing data acquisition device, and relates to the technical field of soil surface water content metering. The device comprises a rack, telescopic damping rods are mounted at the bottom of the periphery of the rack, damping springs sleeve the outer surfaces of the telescopic damping rods, and a protective cover is mounted in the middle of the lower surface of the rack; the multi-source data acquisition lens is arranged in the protective cover, the multi-source data acquisition lens can be ensured to be accurately aligned with the ground under any flight attitude through the arrangement of the stabilizing mechanism, the measurement angle deviation caused by the steering or attitude change of the unmanned aerial vehicle is avoided, and compared with the prior art, through the design of the scheme, the measurement accuracy is improved. Even under complex or severe environmental conditions, such as strong wind, vibration and the like, the design enables the unmanned aerial vehicle to execute a detection task more stably. Through the damping effect of the telescopic reset plastic sleeve and the reset spring and the vertical angle between the multi-source data acquisition lens and the ground all the time, the unmanned aerial vehicle can maintain the measurement precision and stability under adverse conditions.

A high-pressure straight-through plate-type manual throttle valve adopts the overall structural design of a high-pressure stemless, rising-stem plate valve. A gate throttling component is installed within the valve cavity of the valve body. A valve cover component is fixed above the valve body using sealing gaskets and evenly distributed studs and nuts. Above the valve cover component, a support component and a handwheel drive component are fixed via threads and set screws. A valve stem indicator component passes through the center of the valve cover component, support component, and handwheel drive component, connecting with the gate throttling component within the valve cavity. The handwheel drives the valve stem indicator component and the gate, which houses the valve core, to move up and down, changing the number of throttling orifices in the valve core relative to the fixed valve seat channels on both sides, thus regulating the flow rate. Because both the valve core and valve seat are made of hard alloy material, equipped with a composite elastic sealing ring, and a hard alloy wear-resistant layer is welded onto the outlet channel wall of the valve body, this valve becomes a new type of throttle valve characterized by high pressure resistance, low resistance, low energy consumption, accurate metering, long service life, and ease of production.

The utility model relates to the technical field of measuring equipment, and discloses a high-precision distance-adjustable diameter measuring instrument. The technical problems that in the prior art, large-diameter ultrahigh-temperature high-precision measurement cannot be achieved, and the burden of field high-temperature debugging is heavy are solved. The device comprises a left box body and a right box body which are arranged on the two sides of a measured object, a water cooling assembly is sleeved outside the left box body and the right box body, a helium-neon laser transmitter and a telecentric lens are arranged in the left box body, the telecentric lens comprises a biconvex lens which gathers light rays into parallel light, the biconvex lens comprises two convex lenses which are equal in focal length and coincide in focus, and the two convex lenses are arranged in the left box body. A meniscus lens for filtering stray light is arranged between the biconvex lenses, a laser receiver is arranged in the right box body and connected with a photoelectric sensor, and the photoelectric sensor is connected with a computer processor. According to the utility model, the large-diameter ultra-high-temperature high-precision measurement is realized, the burden of on-site high-temperature debugging is reduced, and high-precision measurement can be obtained without too accurate focusing.

The utility model provides a high-temperature infrared detection window convenient to use, which belongs to the technical field of infrared detection windows and comprises a positioning ring sleeve and a fixing ring, an adjusting mechanism is arranged on one side of the back of the positioning ring sleeve, and a cleaning mechanism is arranged at one end of the adjusting mechanism. The cleaning mechanism comprises a connecting bolt, a limiting plate, a hook-and-loop fastener, cleaning cloth, a limiting clamping groove, a reset spring, a limiting clamping block and an arc-shaped sleeve. Through the design of the cleaning mechanism and the combination of a connecting bolt, a limiting plate and a limiting clamping groove, it is ensured that cleaning cloth is stably installed and convenient to replace, the fixing process of the cleaning cloth is simplified through use of a hook-and-loop fastener, and even pressure of the cleaning cloth in the cleaning process is ensured through arrangement of a reset spring; the overall stability of the cleaning mechanism is enhanced through the structure of the arc-shaped sleeve and the limiting clamping block, dirt can be effectively removed in the cleaning work of the high-temperature infrared detection window, and the cleanliness and the measurement accuracy of the window are kept.

The utility model relates to the technical field of voltage transformers, in particular to an electromagnetic voltage transformer which comprises a working table, a lifting groove is formed in the surface of the working table, an anti-vibration pad is installed at the top end of the lifting groove, heat dissipation assemblies are arranged on the two sides of a voltage transformer body, limiting blocks are fixedly installed on the periphery of the anti-vibration pad, and the limiting blocks are fixedly connected with the lifting groove. Limiting grooves are formed in the lower portions of the limiting blocks, limiting rods are fixedly installed at the bottom ends of the four limiting grooves, and a plurality of buffer springs are installed in the lifting groove at equal intervals. Micro deformation, caused by vibration or impact, of the internal structure of the mutual inductor can be remarkably reduced mainly through the buffering effect of an anti-vibration pad; when the voltage transformer body is subjected to stress or vibration in the vertical direction, the buffer springs can absorb and disperse the stress, and the direct influence of the stress on the voltage transformer body is reduced.