49results about How to "Accurate and reliable measurements" patented technology

The invention discloses a method for implementing online tests of stream flow based on video images, and belongs to the technical field of non-contact open channel flow measurement. The method relates to a water flow tracing system, a water surface illuminating system, a video flow acquisition system, a camera calibrating system, an image processing system and a flow estimating system, trace particles are thrown in a flow measuring stream segment by the water flow tracing system, a camera shoots a water surface video stream, frames are extracted at fixed intervals and are processed digitally, the image processing system processes digital images according to ground control point coordinate information provided by the camera calibrating system, and finally, the stream flow is computed by the aid of the flow estimating system according to a flow rate and area method. By the aid of the method, complicity of stream flow measurement is reduced, simultaneously, high measurement precision can be guaranteed, and the stream flow can be dynamically monitored in extreme environments.

The invention discloses a method for monitoring an acting force between a mold and a member by a fiber grating sensor. A basis is laid for quantitative research of the processes of accumulation and change of a residual stress of composite materials. When the acting force between the mold and the member in the forming process of the composite materials is monitored, the method includes following steps: firstly, an FEP thin film layer, a CFRP member pre-forming material, a mold plate, and a fiber grating sensor are laid on a support mold in sequence, and sealed via a vacuum bag; secondly, the fiber grating sensor is connected with a demodulation instrument, the forming is performed by employing the autoclave process, and the fiber grating sensor monitors the curing process strain in real time; and thirdly, acquired data is processed, and the debond stress and the sliding friction stress between the mold and the member are finally calculated. According to the method, the acting force between different molds and members in the forming process of autoclaves can be tested, the operation is simple, real-time monitoring is realized, and the accuracy is high.

Provided are a solar linear concentrating device and a control method. The solar linear concentrating device comprises a linear concentrator (101), a linear receiver (102) and a control system. The linear receiver (102) comprises at least 2 rows of optical receivers arranged in parallel. The control system judges the tracking accuracy according to the proportional relationship between the amounts of energy received by the rows of optical receivers, and thereby adjusts the linear concentrator (101) to accurately track the sun. The solar linear concentrating device has the advantages of a simple structure, a convenient operation and accurate tracking.

The invention relates to a measuring method and an instrument used for assembling and installing locomotive gear cases, which is characterized in that: the instrument comprises a reverse-U shaped bentpipe, one end of the reverse U-shaped bent pipe is connected with a magnetic stand, and the other end of the bent pipe is connected with a measuring steel loop; the bent pipe is arranged at the vertical end of one side of the measuring steel loop and also at the vertical end of one side of the magnetic stand, and the two vertical ends are on the same plane; a connector can be arranged at the joint part of the bent pipe and the magnetic stand, one end of the connector is screwed in the screw thread of the magnetic stand, the other end is welded after inserting into the bent pipe; another connector can also be arranged at the joint part of the bent pipe and the measuring steel loop; the two ends of the connector are welded after respectively inserting into the bent pipe and the measuring steel loop. The invention completely satisfies the design requirement, has easy operation, accurate and reliable measuring values, can be applied to the assembling and installation process of the DF4 locomotive gear case and can also be widely applied to the assembling and installation processes of other types of locomotive gear cases.

The invention relates to a tension roll adjusting device for a film stretching line tractor. Two ends of a universal joint are connected with one end of an output shaft of a motor and one end of a roller shaft respectively. Two ends of a roller are provided with same swing arms respectively. The roller shaft is rotatably connected with upper holes of the swing arms. The other end of a pin with the outer end fixed to a wallboard is rotatably connected with a lower hole of each swing arm. A positioning plate fixed to each wallboard is disposed below each swing arm. Two adjusting bolts upwardly penetrate screw holes of the positioning plates, the upper ends of the adjusting bolts are abutted to the bottom ends of the swing arms, the adjusting bolts move up and down to drive the swing arms to swing, a roller of a tension roll is driven to swing, and tension of a film on the roller is adjusted. An arc-top top pin is fixed to one end of each weighing sensor fixed to the corresponding wallboard. A flat-bottom bottom pin is fixed to the bottom end of a side plate extending out of the rear of each swing arm. The bottom sides of the bottom pins are tangent with the tops of the top pins. The swing arms transmit tension to the weighing sensors though the bottom pins and the top pins so that the tension is measured. The tension roll adjusting device for the film stretching line tractor has the advantages that tension of the film is easy to adjust, measured tension values are accurate and reliable, and the device is simple in structure and easy to implement.

The invention discloses a device for measuring a split-phase flow of a two-phase flow under a steady state condition. The device mainly comprises a steam-water separator, a gas flow meter, a quartz glass tube, a pressure reducing valve and a stop valve. A two-phase flow inlet and a first outlet are horizontally formed in the sidewall of the steam-water separator. A second outlet is vertically formed in the bottom wall of the steam-water separator. The vertically formed second outlet is a two-phase flow separated liquid outlet. The horizontally formed first outlet is a gas / steam outlet. The second outlet is connected with a first metal tube which is in sealed connection with the quartz glass tube with scales. The lower part of the quartz glass tube is in sealed connection with a second metal tube with the stop valve. The first outlet is in sealed connection with a metal pipeline with the gas flow meter and the pressure reducing valve through a flange. Requirements on the measurement of the split-phase flow of an air-water or steam-saturated water two-phase flow are met, and the device can work safely and reliably, and is rational in design, compact in structure, easy to operate, applicable to the measurement of the split-phase flow of the two-phase flow under a high pressure condition and particularly suitable for the measurement of a high-gas content two-phase flow.

A test element analysis system (110) for an analytical examination of a sample (118), in particular of a body fluid, is disclosed. The test element analysis system (118) comprises an evaluation device(112) with a test element holder (114) for positioning a test element (116) containing the sample (118) and a measuring device (134) for measuring a change in a measuring zone (122) of the test element (116), the change being characteristic for an analyte. The test element holder (114) contains contact elements (132) with contact surfaces (133) which allow an electrical contact between contact surfaces (117) of the test element (116) and the contact surfaces (132) of the test element holder (114). The contact surfaces (133) of the contact elements (132) of the test element holder (114) are provided with an electrically conductive surface (145) containing metallic ruthenium (146).