54results about How to "Simple measuring device" patented technology

The invention provides a monitoring and measuring method using a displacement sensor to measure tunnel deformation. The monitoring and measuring method comprises the steps of setting a measurement point on a section of an arc tunnel, and connecting a line; arranging a connection rod at an arc measurement point; fixing a displacement transfer rod on the connection rod and fixing a first base on the connection rod; arranging a horizontal measuring rod at the position of the measuring point, and arranging a second base on the horizontal measuring rod; respectively setting the crosspoints of the displacement transfer rod and a horizontal measuring line as a first measurement point and a second measurement point; fixing a displacement sensor bracket on the first base or the second base, and arranging a horizontal direction displacement sensor and a vertical direction displacement sensor on the displacement sensor bracket; measuring horizontal clearance variation and vertical clearance variation, judging the deformation situation of the tunnel accordingly, calculating the horizontal clearance variation between a left measurement point and a right measurement point, and calculating a mean value of the vertical clearance variation between the arc measurement point and the horizontal measurement line. The monitoring and measuring method provided by the invention has the advantages of rapidness in test, high testing precision, less interference on construction and low cost, can be used for monitoring in real time, and can be used for determining whether the tunnel is biased or not according to the testing result of the clearance variation of the channel.

The invention discloses a device and method for testing air cooling heat-removal system performance. It sets specimen in flue of air cooling heat-removal. By controlling the temperature difference between specimen and external temperature to determine thermal convection resistance of the system, the performance of the system would be judged according to the thermal convection resistance. It has the advantages of simple method, high sensitivity, low cost and real time detecting heat-removal situation, and improving the maintainability of communication device.

A microwave sensor used for steam humidity detection belongs to the technical field of testing and is used to solve the problem of steam humidity detection. The technical solution is that it includes a cylindrical cavity with openings at both ends and a microwave signal transmission interface in the middle, and a ring divider is respectively arranged at both ends of the cylindrical cavity, and the ring divider is composed of It consists of 1 to 4 cylinders coaxial with the cylindrical cavity, one end of which is close to the port of the cylindrical cavity is connected with the cylindrical cavity, and the expansion coefficient of the ring separator is larger than that of the cylindrical cavity. The invention has the advantages of simple structure, convenient use and low requirements on the environment, and can realize high-precision online measurement of the humidity of flowing wet steam by cooperating with the microwave signal processing circuit.

The invention relates to a device and a method thereof for acquiring a transmission fluctuation spatial correlation spectrum. A polychromatic light source is used for irradiation, when the light source passes through a dispersor, the distances between an incident light focus and reflected light focuses with different wavelengths in a measurement region are different, and thus the corresponding spatial correlations are different. An incident light beam and a reflected light beam are dispersed and absorbed in the measurement region under the action of particles, thereby causing extinction. A split light beam passes through a half reflecting and half transparent plain glass and is focused on a light sensing element by a lens, thereby obtaining a transmission correlation spectrum. The invention effectively solves the problem that the particle measurement range is limited because of mechanical operation in the measurement process. A transmission fluctuation spatial correlation spectral method is irrelevant to the flow field of the particles, has simple structure and can be used for detecting a particle system in laminar flow and onflow states in real time and on line, thereby testing the particle size distribution and the concentration of micron-sized particles. The invention can be widely applied to various fields of scientific research, production and process control of chemical industry energy sources, environment protection, water quality detection and particle measurement.

The invention discloses a device and a method for measuring disturbance of a cross flow fan impeller of a pulsed gas laser. The device and the method are mainly used for measuring the disturbance of the fan impeller. The device comprises an exploring laser light source, a beam expanding system, two spectroscopes, two reflecting mirrors, a photoelectric detector, a data acquisition unit and a processor, wherein the two spectroscopes and the two reflecting mirrors form a Mach-Zehnder interferometric system; the two spectroscopes are respectively arranged at both ends of a flow field area to be tested; the exploring laser light source, the beam expanding system and a first spectroscope are located on the same light path in sequence; and the photoelectric detector is located on the emergent light path of a second spectroscope. The method comprises the following steps: performing filtering on a signal, and then performing fast Fourier transform (FFT) treatment on the signal through controlling the data sampling frequency and the number of samples; converting a periodic disturbance signal of a time domain into a signal of a frequency domain to obtain a signal spectrum so as to determine the disturbance of the fan impeller. According to the device and the method disclosed by the invention, the disturbance information of fan rotation is obtained through an optical measurement mode. The device and the method have the characteristics that the measuring device is simple and is high in precision and convenient in operation and the method is very high in practical applicability.

The invention relates to the technical field of measurement and provides a method for measuring and calculating the median particle diameter of particles in the exhaust gas of a compression ignition engine. A method for measuring the median particle diameter of the particles in the exhaust gas of a diesel engine mainly comprises the following steps: collecting particle samples to be measured; dispersing the particle samples to be measured; acquiring an electron microscope image of dispersed particles; judging the dispersion degree of agglomerated particles; and solving the diameter of a single particle in Mi to finally obtain the median particle diameter D50 of the particles in the exhaust gas of the diesel engine. Compared with the prior art, the method has the characteristics that the particle diameter can be obtained without conversion of the current and the particle diameter; and the particles with the particle diameter of 0.1 to 0.5 micron can be intuitively obtained. Through the particle electron microscope image processing, the single particle can be distinguished, and the particle diameter measurement accuracy of the particles is improved.

The invention discloses a damage-free quick measurement method of a high temperature contact thermal resistance. According to the medium temperature-ultrasonic propagation characters, ultrasonic propagation time under a transient heat transfer condition is acquired by means of an ultrasonic-echo method, and further the inverse problem of thermo-conduction is subjected to optimization solution, sothat the interface contact thermal resistance parameters, changing with temperature, are measured in a quick, damage-free and non-contact manner. The method only needs simple measurement devices and short measurement period, is free of contact between a sensor and a to-be-tested test piece, so that interference due to the contact between the sensor and the to-be-tested test piece and limitation onmeasurement range due to high temperature resistance of the sensor are avoided.

The invention provides an ultrasound-based non-destructive measurement method of the intensity and position of an internal heat source. The method is characterized in that the time delay characteristic and the boundary temperature variation of ultrasonic waves during the internal propagation in a structure are simultaneously considered, and the solution is performed combining with inverse heat conduction problems, so as to perform non-destructive and fast measurement on the intensity and position of the heat source, which can change along with time in the structure. In the invention, no temperature information of internal points of the structure is needed to be acquired, so that measuring devices are simplified, and the operation is easy and convenient; and compared with an infrared detection technique of the internal heat source, the method disclosed by the invention can more effectively detect the intensity and position of the internal heat source of the structure, and has the advantages of high measuring speed, large measuring range and the like.

The invention provides a system for measuring the reflectivity of a large-aperture optical element. In the system, a first light beam adjusting device converts wide-spectrum ultrafast laser into a linear light beam or a rectangular light beam; the initial optical resonant cavity does not comprise an optical element, and the linear light beam or the rectangular light beam is ring-down in the optical resonant cavity to form a first ring-down signal; the linear light beam or the rectangular light beam is ring-down in a test optical resonant cavity comprising an optical element to form a second ring-down signal; and correspondingly determining first ring-down time of an initial optical resonant cavity and second ring-down time of a test optical resonant cavity according to the collected first ring-down signal and the second ring-down signal, and obtaining the reflectivity of the optical element according to the first ring-down time, the second ring-down time, the cavity lengths of the initial optical resonant cavity and the test optical resonant cavity. According to the invention, the reflectivity measurement precision and speed of the optical element can be improved.