56results about How to "Detection high" patented technology

The invention discloses a three-dimensional detection method for use before exploitation of a working surface coal bed. The method comprises the following specific steps of: detecting whether a buried geological structure exists at the position of the working surface coal bed by adopting a radio wave tunnel penetration technology, and determining the specific position and range of the buried geological structure; detecting whether a buried water guide structure exists in the range of a working surface bottom plate or top plate by adopting an amplitude-frequency-electricity penetration technology, and determining the specific position and range of the buried water guide structure; detecting whether a buried water guide structure exists below a tunnel bottom plate by adopting a direct-current depth measurement technology, and evaluating; and completely detecting whether buried water guide structures exist inside the working surface and on the bottom plate, the top plate and the periphery by adopting a transient electromagnetic detection technology. The three-dimensional detection method has the beneficial effects that true space detection is realized, the water inrush hidden trouble situation in the damage influence range of stoping on the working surface coal bed can be checked to the maximum extent, accidents are effectively avoided, and the life and property safety of people are ensured.

The invention provides a distributed thermal pipeline leakage monitoring system. The system includes an optical fiber temperature measurement host, an industrial computer, and a temperature measurement optical cable, wherein: the optical fiber temperature measurement host includes N temperature measurement channels, and each temperature measurement channel is connected to A temperature measurement optical cable, the temperature measurement optical cable is laid along the whole pipeline with the thermal pipeline as the carrier, the temperature measurement channel sends pulsed light signals to the temperature measurement optical cable, and the scattered light sent back from the temperature measurement optical cable is collected in real time, according to the refractive index of the temperature measurement optical cable And the scattered light intensity, get the temperature and temperature change rate numerical curve of the whole line on the thermal pipeline, and determine the average temperature and maximum temperature change rate of the required monitoring position through the length of the optical cable laid on different monitoring positions from the optical fiber temperature measurement host , and determine whether each thermal pipeline is in a leaking state according to the set temperature change rate threshold.

The invention relates to a flame recognition algorithm based on image processing technology, belonging to the technical field of fire detection systems. Combustion of common substances usually produces flames, and the flames produced by fires have obvious image features, so flame recognition is used as a specific method of fire detection. The patent of the invention mainly finds the highest point and the center of gravity of the flame through the extraction algorithm of the inner and outer flames, and records the coordinates of the two points respectively; then makes a line connecting the two points and extracts the RGB value on the line connecting the two points; The RGB value on the line is compared with the standard flame RGB feature library, and a matching value is obtained by comparison, and then whether the image is a flame image is determined by the size of the matching value.

The present invention uses the following steps to survey eyes in given image: reading in image, analysing the image to obtain candidate eye zone listing as unchecked candidate eye zone being selected, confirming an adjacent area for selected candidate eye zone and calculating adjacent area size S to obtain dark field, counting dark field and recording the counting value as N, comparing specific value N / S with preset first threshold and determining abovesaid candidate eye zone to be false eye zone to delete it out from listing if specific value N / S is less than the first threshold, otherwise candidate eye zone being true one to keep it in listing, repeating abovesteps till all candidate eye zone being checked and to output listing for post-processing.

The invention discloses a lanthanum manganate / semiconductor metal oxide composite gas-sensing material and a preparation method thereof, which is characterized in that the composite gas-sensing material is composed of semiconductor metal oxide and lanthanum manganate. Compared with pure semiconducting metal oxides, the gas sensing performance of LMO / semiconducting metal oxide composite gas sensing materials has been improved by more than 70%.