47results about How to "Meet detection needs" patented technology

The invention discloses a detection method based on a high-density electric method for the dominant channel of bedrock fissures, and relates to the technical field of bedrock fissures research. The invention utilizes the relatively high conductivity of sodium chloride solution and its tendency to edge along the bedrock inner fissures According to the natural characteristics of channel flow, the instantaneous rock mass resistivity of each point in the bedrock is monitored multiple times by high-density electrical instruments during the monitoring period, and the rock mass resistivity change rate of each point in the bedrock is calculated, and the rock mass resistivity The distance and depth information corresponding to the peak point of the change rate determines the distribution points of the dominant channel of the fracture, and finally connects the distribution points to obtain accurate shape and spatial position information of the dominant channel of the fracture. The present invention fills the technical gap in the detection of the form of the dominant channel of the crack in the field, and a distributed conductivity meter is installed in the observation well, and the spatial position information of the dominant channel of the crack is corrected through the depth corresponding to the peak point of the change rate of the fluid conductivity, ensuring that the crack Accuracy of dominant channel detection results.

The invention belongs to the technical field of space charged particles, and particularly relates to a modularized space charged particle detector. The modularized space charged particle detector comprises a light blocking piece module, a probe upper cover plate, a first sensor module, a sensor distance adjustor, an anticoincidence scintillator, more than two second sensor modules, a probe casing, a probe casing bottom plate and a photodiode, wherein the light blocking piece module and all sensors in the detector are designed into independent modules, and only by properly increasing or reducing the quantity of the sensor modules according to the energy range of charged particles to be detected, the detection requirements of the charged particles with different energy ranges can be satisfied. The detector meets the detection requirement of the space charged particles with different orbits and different energy ranges, and provides the possibility for the large-scale application of the space charged particle detectors.

The invention discloses a non-contact multi-scale crack identification method. The method comprises the following steps: (1) acquiring surface image data of a to-be-detected object; (2) converting theimage into a grayscale image; (3) performing threshold processing on the image to separate the crack from the background; (4) setting a local threshold value, processing the selected local area, andremoving stains in the background; (5) extracting independent cracks in the image; (6) performing noise point filtering on the independent cracks, and judging true cracks in the independent cracks; (7) assembling all the true cracks to obtain a final crack image; meanwhile, analyzing the geometrical characteristics of the cracks, and outputting the geometrical information of the cracks. The methodis ingenious in design and convenient to apply, non-contact real-time monitoring of cracks is achieved in mechanical research, and the crack behavior can be monitored in the loading process; meanwhile, automatic monitoring, detection and analysis of cracks in the engineering field can be achieved, and the problem that time and labor are consumed for crack monitoring in the engineering field is solved.

The invention provides a picosecond balance pulse signal generator. The picosecond balance pulse signal generator comprises a pulse signal generation circuit, a first shaping circuit and a second shaping circuit. The pulse signal generation circuit comprises an avalanche triode pulse generation circuit which is formed by two cascaded avalanche triodes and used for generating a bipolar nanosecond balance pulse signal by an inputted negative polarity trigger pulse signal via triggering. The front end of the first shaping circuit is electrically connected with the pulse signal generation circuit and used for shaping the nanosecond balance pulse signal so that a picosecond pulse signal is generated. The front end of the second shaping circuit is electrically connected with the first shaping circuit and used for shaping trailing and overshoot of the picosecond pulse signal. The high-amplitude picosecond balance pulse signal generator is simple in structure and small and exquisite in circuit structure, and the generated balance pulse waveform is great in symmetry, small in trailing and high in amplitude so that the picosecond balance pulse signal generator can be applied to a pulse type ultra wide band radar system, and detection requirements of the pulse type radar system for different depth and resolution can be met.

The invention provides an amplitude increasing and width reducing circuit unit and a pulse signal generating circuit and generator comprising the amplitude increasing and width reducing circuit unit. According to the amplitude increasing and width reducing circuit unit, two avalanche transistors which are cascaded are used as a basic unit circuit to construct the nanosecond balance pulse signal generator, and compared with a pulse generating circuit composed of a single avalanche transistor, pulse signals generated by the nanosecond balance pulse signal generator are large in amplitude, the pulse front edges are steep, and circuit reliability is high.

The invention discloses an infrared-visible dual-band photoelectric detection system and a method for measuring the deflection angle of the optical axis. The photoelectric detection system includes a reflection system, a beam splitter, a visible light imaging unit located on the reflection light path of the beam splitter, and a mid-wave infrared light imaging unit in the transmission light path unit, and the optical axis deflection angle measurement unit, the optical axis deflection angle measurement method includes: 1. Initialize the CCD sensor and obtain the background grayscale image; 2. Mid-wave infrared optical axis alignment; 3. Visible light spot imaging; 4. Visible light Acquisition of light spot images; 5. Acquisition of centroid coordinates of visible light spot images; 6. Calculation of optical axis declination. The invention combines the advantages of the visible light band optical system and the mid-wave infrared band optical system, improves the efficiency of observation and detection, realizes long-distance, high-resolution and all-weather imaging, and effectively improves the imaging quality, and the optical axis deflection angle measurement unit can measure visible light The deflection angle between the optical axis and the mid-wave infrared optical axis measures the stability of the entire photodetection system.