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173 results about "Porch" patented technology

A porch (from Old French porche, from Latin porticus "colonnade", from porta "passage") is a term used in architecture to describe a room or gallery located in front of the entrance of a building forming a low front, and placed in front of the facade of the building it commands.

Laser ranging device and laser ranging method thereof

The invention provides a laser ranging device and a laser ranging method thereof. The device includes: a photoelectric conversion circuit, used to convert the laser signal into a first electrical signal; an amplifying circuit, used to amplify the first electrical signal and output a second electrical signal; a comparison circuit, used to convert the second electrical signal The voltage value during the leading edge period and the voltage value during the trailing edge period are respectively compared with a preset threshold voltage in real time to obtain a leading edge trigger signal and a trailing edge trigger signal; the timing circuit is used to obtain the corresponding first moment and the second Two moments; and a processor with a built-in algorithm, used to obtain the pulse width value of the second electrical signal according to the time difference between the two moments. The present invention obtains the rough value of the measured distance through the frontier time identification technology, and at the same time obtains the pulse width of the echo signal, and the processor uses the relationship between the distance and the pulse width to call the algorithm to compensate, and obtain the high-precision distance measurement value at the same time The reflectivity of the target object is also obtained.
Owner:SHANGHAI SLAMTEC

Method for improving the seismic resolution

ActiveUS20050286344A1Improving seismic resolutionEnhance apparent dominant frequencySeismic data acquisitionSeismic signal processingFrequency spectrumPorch
This invention relates to a method for improving the seismic resolution in the field of petroleum exploration and development. The major problems with regard to the present low vertical seismic resolution, and the thin layer, which is recognized by the seismic data administered with difficult, may be resolved according to the present invention. This method essentially comprises the following steps of: (a) ensuring the depth and the velocity of the low-velocity layer and the high-velocity layer and the characteristic of the frequency spectrum of the seismic wave at the near-surface using the borehole-micro-logging method; (b) separating the virtual reflected wave from the seismic record in the high-velocity layer using the processing method of the vertical seismic section, and improving the SNR of the seismic record of the direct path wave at the high-velocity layer using the stack processing method of porches of the vertical seismic section; (c) evaluating the de-convolution operator of the near-surface by the convolution math-physics type equation; (d) evaluating the seismic record with high resolution by the de-convolution math-physics type equation; (e) providing the band-pass filtering and geologic interpretation to the seismic record with high resolution. Using the method of the present invention, the apparent dominant frequency may be reached to 200 Hz and higher, the vertical seismic resolution is improved, and the problem that it is difficult to recognize the thin layer by the present seismic exploration is resolved.
Owner:PETROCHINA CO LTD +1
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