47results about How to "Measurement will not affect" patented technology

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.

This invention discloses an atomic force microscope measurement method based on angle measurement, which belongs to the test technique of the signals of atomic force microscope APM probe and cantilever. This method adopts angle sensor by which the rotation angle of the probe is measured and is converted into the electrical signals at a proportion with the angle change value. It gets the angle change of the cantilever caused by the measurement force through signal analysis and process and further to get the surface outline of the object pf the probe.

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 discloses a method and a device for measuring the reflectivity of a heliostat. The method includes S1: constructing an optical cavity by placing the first heliostat and the second heliostat in parallel; S2: receiving a light beam at the first heliostat side of the optical cavity, and the light beam passes through the first heliostat at the first fixed Oscillate back and forth between the heliostat and the second heliostat, and output the oscillating beam on the second heliostat side of the optical cavity; S3: Measure the spectrum of the oscillating beam to obtain the oscillating spectrum signal; S4: According to the light intensity of the oscillating spectrum signal Data, calculate and obtain the ring-down ratio, and calculate and obtain the reflectivity to be measured according to the ring-down ratio. Because the method realizes the measurement of the reflectivity of the heliostat by measuring the ring-down ratio of the intensity of light, there is no requirement for the stability of the light source, and no additional calibration work is required. The light source does not depend on the technical characteristics.

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 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 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.