32results about How to "Simple and reliable measurement" patented technology

The invention relates to a method for controlling injection of a reductant into a NO_x containing exhaust gas stream from a combustion engine, where combustion of a known fuel takes place and where the HO_x is reduced by selective catalytic reduction, SCR, in the presence of a SCR catalyst, comprising establishing signals related to exhaust gas flow, HO_x concentration in the exhaust gas stream upstream of the catalyst, exhaust gas temperature upstream of the SCR catalyst, exhaust gas temperature downstream of the SCR catalyst and to input data for catalyst characteristics. From the signals an adjusted amount of the reductant is calculated by using a calculated amount of reductant and a value d(E*T)/dt, where E is the exhaust gas flow, T is the exhaust gas temperature upstream of the catalyst and t is time.

A high-precision liquid level, temperature, density multifunctional measuring system comprises a liquid level transducer, wherein the output signal of the liquid level transducer is transmitted to a signal processing and displaying circuit; a liquid level transducer shell is connected with a connection rod; the connection rod is connected with an anti-explosion junction box by an adapter; the signal processing and displaying circuit is fixed in the anti-explosion junction box; a contrast measurement sensor and a main liquid level measurement sensor, which are distributed up and down and are vertical to the liquid level, are packaged in the liquid level transducer shell; the back surface of the main liquid level measurement sensor is further provided with a temperature sensor; the signal processing and displaying circuit comprises two signal transducer units and is respectively connected with the main liquid level measurement sensor and the contrast measurement sensor; the two signal transducer units are connected with a main processor unit; the temperature sensor is connected with the main processor unit; and the main processor unit is connected with an LED (light emitting diode) display unit. The multifunctional measuring system is capable of synchronously measuring the liquid level, the density and the temperature of the liquid, and has the characteristics of high precision, high sensitivity and good linearity.

The invention relates to a superconducting level measuring apparatus for liquid hydrogen in liquid hydrogen vessels, in particular vehicular tanks, a superconductor (1) based on magnesium diboride MgB₂ being arranged vertically or inclinedly to the vertical in a liquid hydrogen vessel (5), and a controllable heat source (2) being arranged on the upper region of the superconductor (1), the superconductor (1) being electrically contacted with a controllable current source (3) as well as a voltage measuring apparatus (4) and the level being measured by measuring a voltage. The MgB₂ material is preferably employed as a filament wire. Continuous level measurements of high spatial and temporal resolution can be implemented in uncomplicated fashion. The level measuring apparatus and the method are also suitable for level measurement of liquid neon.

The invention relates to a telescopic feed beam for a rock drill and to a method of measuring a travel length. The pressure surface of a piston (11b) in a feed cylinder (11) of the feed beam is twice as large as the pressure surface of a piston (6b) in a feed extension cylinder (6). Furthermore, the feed beam comprises a flow indicator (19) for measuring the volume flow rate of hydraulic fluid fed and/or discharged, and thereby the travel length.

The invention relates to a liquid helium level gauge, comprising a holding member, a slender member and a special temperature sensing color-varying coating; the holding member is installed at the first end of the slender member; the special temperature sensing color-varying coating is coated on the side surface of the slender member along the length direction of the slender member; the color of the special temperature sensing color-varying coating when at normal temperature is different from that in liquid helium; preferably, the special temperature sensing color-varying coating is stratified silicate coating; the cross section of the slender member is arc-shaped, L-shaped, H-shaped, round, elliptic, semicircular, rectangular, and the like; the special temperature sensing color-varying coating is coated on at least one side surface of the slender member; the side surface of the slender member is provided with a scale label extended from the second end of the slender member to the first end axially. The invention further provides a method for measuring liquid helium level using the liquid helium level gauge. The liquid helium level gauge has smart design, simple structure and convenient use, and is capable of quickly and accurately measuring the liquid helium level; and the liquid helium level gauge is applied to large-scale popularization and application.

A method for estimating the insulation resistance between a terminal of a battery (Batt) and an electrical earth, comprising: -connection of a measuring circuit (CM) to one terminal of the battery (Batt), said measuring circuit comprising a resistance (R) of known value and a capacitance (CE); and -application (1) of a known input signal having an input voltage (Ue). The method further comprises: -measurement (2) of an output voltage between the earth and a point (P) located between the resistance (R) of known value and the capacitance (CE); -determination (3) of a complex impedance of a dipole consisting of the capacitance (CE) and the insulation resistance (Risol) or determination of the parameters of a differential equation; and -determination (4) of the insulation resistance (Risol) from the parameters of the differential equation or said complex impedance.

The invention relates to a method for preprocessing a biological sample by using freeze drying technique. In the invention, a freezedryer is utilized to make the biological sample into freeze-dried powder, organic solvent is utilized to extract target compounds in the sample, and the target compounds are analyzed. The method completely eliminates moisture in the sample, reduces interference of endogenous substance, changes the sample to be loose porous powder, increases the specific surface of the sample, enhances the extraction percentage of the organic solvent to the target compound and simplifies the operating procedure. Because the freezedryer can process a plurality of samples at the same time, analysis and test procedure to a plurality of biological samples is simplified, and the time for preprocessing the samples can be saved.

The invention provides a Y capacitor balance detection method, system and circuit. The method comprises the following steps of: continuously acquiring a first voltage of a first insulation detection point and a second voltage of a second insulation detection point on a voltage division circuit connected in parallel with a Y capacitor in an insulation detection circuit; respectively calculating theslope K1 of the first voltage and the slope K2 of the second voltage which are continuously acquired; calculating a slope difference K12 between the first voltage and the second voltage; and judgingwhether the charge on the Y capacitor is balanced or not according to the values of K1, K2 and K12. After the technical scheme is adopted, the detection of the charge balance on the Y capacitor is converted into the detection of the relationship between the slopes of the insulation detection points, the measurement is simple and reliable, whether the charge on the Y capacitor is balanced or not can be accurately judged when the battery voltage does not fluctuate, fluctuates upwards or fluctuates downwards, the waiting time of the insulation detection is reduced, and the accuracy of the insulation detection is ensured.

The invention discloses a device wire clip punching and positioning device, which includes a main body rod, the main body rod is cylindrical, a positioning ruler is fixed on the main body rod, and there is a gap between the main body rod and the front end of the positioning ruler is provided with a positioning hole. The lower edge of the positioning hole is at the same level as the front end of the main rod, and the front of the main rod is provided with a groove, and the positioning wheel is placed in the groove, and the rotating rod penetrates the cavity of the main rod from the rear end of the main rod and enters the positioning wheel The fixed cavity of the positioning wheel is fixed in the groove, and the positioning wheel rotates in the groove with the rotation of the rotating rod. The fixed cavity of the positioning wheel deviates from the center of the positioning wheel, and the fixed cavity is thicker on one side and thinner on the other. The invention can measure the position of the drip hole of the equipment line clamp and quickly locate and punch the hole. The position of the drip hole is accurate, which can effectively remove accumulated water and improve the reliability of the future operation of the equipment line clamp.

The invention relates to a force measuring device for clamping an elevator suspension device. The aim is to provide the force measuring device for clamping the elevator suspension device, and the force measuring device has the characteristics of high universality, simplicity in installation and reliability in measurement. According to the technical scheme, the force measuring device for clamping the elevator suspension device is characterized in that the device comprises a fixed support which is connected with a suspension device through a lifting belt and can be placed at the bottom end of ashaft opening in a blocking mode, a force measuring module installed on the upper surface of the fixed support to measure the stress condition of the suspension device and provided with a signal processing unit and an anti-falling module used for connecting the fixed support with the suspension device to prevent the fixed support and the clamping module from falling accidentally during installation.