46results about How to "Measurement will not affect" patented technology

The invention relates to an absolute train speed measuring device, which is arranged close to a track on a train and comprises a basal body, an optical lens arranged on the basal body and positioned above a track, a light source arranged outside the optical lens, a data acquisition unit capable of acquiring a track image with high frequency and small data volume and a signal processing unit for processing the image to acquire speed and direction information. The data acquisition unit is arranged in the basal body and positioned above the optical lens, and the signal processing unit is arranged in the basal body and connected with the data acquisition unit. The invention further relates to a train speed calculating method, wherein the absolute speed value of the train is calculated by adopting a spatial filtering method, and the speed direction of the train is recognized by adopting a Fourier algorithm or a recognition method of a D trigger or installing an acceleration sensor in the train. The absolute train speed measuring device and the speed calculating method can accurately measure the absolute speed of the train relative to the ground in real time, are small in measuring dead area and are not influenced by climates.

The invention discloses a real-time brain electrical impedance detection method based on high frequency excitation. The method is characterized by comprising an excitation unit, an impedance network, an analogue signal processing unit, a brain electricity amplifying unit and a digital signal processing unit. The method includes the steps that the excitation unit is a current source and generates an excitation current I which comprises sine components of high-frequency f1 and high-frequency f2; the excitation current acts on the impedance network and generates a voltage signal U which is processed by the analogue signal processing unit and the brain electricity amplifying unit respectively; the analogue signal processing unit conducts amplification, filtration and analog-digital (AD) convention on the voltage signal U at last and sends the voltage signal U to the digital signal processing unit; and the digital signal processing unit calculates electrode contact impedance of a brain electrical signal frequency range by using acquired voltage U and the known excitation current I. By means of the real-time brain electrical impedance detection method based on the high frequency excitation, the impedance in the brain electrical signal frequency range can be acquired in real time.

The invention provides a method for separating and detecting harmful phenols in main stream smoke of cigarettes to overcome the drawback of the prior art that a high efficiency liquid chromatography can only measure the mixed content of m-cresol and p-cresol when used to detect the harmful phenols in the main stream smoke of the cigarettes by adding a certain amount of beta-cyclodextrin in a flowing phase of the high efficiency liquid chromatography. Thus, while successfully separating and detecting isomers of the m-cresol and the p-cresol, the method avoids influencing the separation and measurement of the content of o-dihydroxybenzene, m-dihydroxybenzene, p-dihydroxybenzene, phenol and o-cresol. The method is expected to be applied to daily detection of harmful phenol substances of cigarette products.

The invention discloses a capacitive cement-based humidity sensitive element and a preparing method thereof. The element is composed of a cylindrical cement-based blank and ring-shaped electrodes, wherein the ring-shaped electrodes are located at the positions which are spaced from two end openings of the cylindrical cement-based blank by 10-20 cm and are inwards parallel to the two round faces, the cylindrical cement-based blank and the ring-shaped electrodes are bonded in a sealed mode through copper powder mixed with conductive adhesive, and the ring-shaped electrodes are connected with a wire. The element is good in durability, a certain quality of porous adsorbing materials are doped, the element makes close contact with a building and can synchronously detect the relative humidity in a building structure in time, and measurement results are timely and reliable. Durability of the building structure will not be affected by burying the measuring element, the humidity sensitive element is low in price, and therefore construction cost can be reduced greatly.

The invention provides a monitoring method and device on the basis of a base station network and a base station. The monitoring method includes steps that a base station to be monitored stops transmitting user data at a preset monitoring moment, reference signals are filled into frequency domain resources of the monitoring moment to generate monitoring signals and the monitoring signals are transmitted to a monitoring base station; the monitoring base station stops transmitting the user data at the monitoring moment and receives the monitoring signals. Via signal channel evaluation and signal channel quality measurement according to the monitoring signals, range of the monitoring base station is enlarged and the problem that conflict exists between base station coverage of the base station network and the monitoring function is solved on the premise of not increasing transmission power and extra cost and no affection on user business.

This invention relates to a system for monitoring the position of a measuring unit when placed on a person, especially on the chest of a person, the system comprising a drive unit generating a magnetic field oscillating at a predetermined frequency adapted to be positioned on the opposite side of the person, e.g. chest to back dimensions, and the measuring unit being adapted to measure the magnetic field strength, the system including calculating means for calculating the distance between the measuring unit and the drive unit.

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 ballscrew noise measuring method based on a microphone array, and the method comprises the steps of processing a microphone array signal by a near field wave beam formation method; setting a weighting and a time delay coefficient according to object sound source position information to make the microphone array wave beam align at a nut position of the ballscrew always. In this way, the signal to noise ratio of noise measurement is improved. The method comprises the steps of installing the ballscrew on a comprehensive properties experiment table; arranging the microphone array close to the experiment table; collecting a microphone array signal and a nut position signal at the same time; synchronizing the array signal and the position; dividing a time domain signal into n segments; conducting near field wave beam formation processing to each segment; and synthesizing array signals of all segments to obtain the noise of the ballscrew.

The invention discloses a measurement method and device of heliostat reflectivity. The measurement method comprises the steps that S1, an optical cavity is constructed by parallel placement of a firstheliostat and a second heliostat; S2, a beam is received on the first heliostat side of the optical cavity and oscillates back and forth between the first heliostat and the second heliostat through the first heliostat, and an oscillating beam is output on the second heliostat side of the optical cavity; S3, the spectrum of the oscillating beam is measured, and oscillating spectrum signals are obtained; and S4, according to intensity data of the oscillating spectrum signals, the attenuation ratio is calculated and obtained, and the reflectivity need to be measured is obtained according to theattenuation ratio. Because the method can measure the reflectivity of the heliostats by measuring the attenuation ratio of light intensity, the stability of light source is not required, additional calibration work is not needed, and the measurement method has the technical characteristics of accurate, fast, direct and light source-independent reflectivity measurement.

The invention relates to a triangular stereoscopic measuring instrument which can be used to measure the distance and the angle within a narrow range in power engineering and belongs to the technical field of measuring instruments. The triangular stereoscopic measuring instrument comprises a fixed disk and three support rods of the same height, the support rods are fixed to the bottom of the fixed disk, the top of the fixed disk is provided with a gradiometer, the bottom of the fixed disk is provide with a fixed guide rail and a movable guide rail, the bottoms of the fixed guide rail and the movable guide rail are provided with guide rail grooves respectively, one end of the movable guide rail is mounted in the fixed guide rail and can move to and fro in the groove of the fixed guide rail, the groove of the fixed guide rail is internally provided with two connecting balls, the two connecting balls are respectively placed at the two ends of the movable guide rail, the groove of the movable guide rail is provided with another connecting ball which can slide in the groove of the movable guide rail, and the three connecting balls are fixed to the support rods respectively. The triangular stereoscopic measuring instrument of the invention can be applied to power engineering, is simple in operation, high in measuring precision and capable of measure the distance and the angle.

The present invention belongs to the field of chemical analysis instrument technology, and is process of applying white light interference system in measuring variable light absorbing wavelength of spectrophotometer. When the white light Michelson interference system is used in spectrophotometer, optimal absorbance value is first set, the amount of the sample is controlled to alter the absorption wavelength of the measured liquid, and the absorption wavelength is then calculated based on the upper surface position change of the measured liquid to complete the quantitative analysis on the measured liquid. The present invention has the advantages of wide measurement range, high precision, and capacity of directly measuring the absorbance index or concentration of liquid.

The invention relates to a method for measuring displacement of a household electric window by utilizing a potentiometer, which is characterized by comprising storing a variable a for representing a value of the potentiometer when a window body of the household electric window is closed in place; storing a variable b for representing a value of the potentiometer when the window body of the household electric window is opened in place; storing a variable c for representing resistance difference between every two adjacent positions, and evenly dividing the distance from the position where the window body of the household electric window is closed in place to the position where the window body of the household electric window is opened in place into n positions, wherein the number of n selects values from natural numbers, and n is accuracy constants; dynamically updating two end resistance values a and b of the potentiometer for measuring the displacement by utilizing information about in-place closing and in-place opening of the window body, and enabling changes of the resistance values of the potentiometer to not influence the measurement of the displacement. Compared with the prior art, the method for measuring the displacement of the household electric window by utilizing the potentiometer has the advantages of effectively improving accuracy of the displacement measured by the potentiometer.

The invention relates to the field of car dumpers and discloses a materialplanner cleaning device of a car dumper, a car dumper system and an unloading method of the car dumper system. The materialplanner cleaning device comprises a cleaning module (1) for cleaning a materialplanner, a control module for controlling the cleaning module (1), and a measuring module electrically connected with the control module and used for measuring the overturning angle of a carriage dumping materials into a hopper of the car dumper. The control module is arranged to control the cleaning module (1) to clean the materialplanner after receiving the information, fed back by the measuring module, of overturning of the carriage from the horizontal position to a first preset angle, and thus the cleaning module can clean the materialplanner within the time quantum when the carriage is overturned to enable a material flow to shield a detection route of a measuring device or to enable material flying dust to affect the measuring result of the measuring device. The car dumper operates circularly, the cleaning device can conduct cleaning operation circularly correspondingly, measurement of the materialplannercannot be affected, and meanwhile the accuracy and stability of the measuring result of the materialplanner are ensured.