Help with Eddy Current Probes specifications:
NDT Probe Technology
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| NDT Probe Technology | |||
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| Eddy Current | Eddy current probes generate high frequency magnetic fields to induce detectable eddy currents in ferrous and nonferrous materials for flaw detection, weld inspection, and other nondestructive test applications. The magnitude of the eddy currents varies with the distance between the probe and sample. Two different detection formats are available: absolute and differential. Absolute detection uses a single pickup coil for flaw and crack detection and can detect both gradual and sharp changes. With differential detection, the detection of two pickup coils is compared for a greater resolution of sharp discontinuities or flaws. | ||
| Inductive | Inductive NDT sensors and probes employ two coils around a soft iron core. An energizing alternating current is applied to the inductive coil, which produces a low frequency magnetic field. The strength of the magnetic field or magnetic flux changes with the distance of between the probe and sample. The magnetic flux changes are picked up by the second sensing coil. | ||
| Magnetic / Hall Effect | Hall effect or magnetic NDT sensors and probes employ a permanent magnet. A Hall effect sensor around the permanent magnet picks up changes in the magnetic field due to the ferromagnetic sample. Thickness and coating thickness can gage using this method on ferromagnetic materials (iron, nickel, etc.). | ||
| Specialty / Other | Other unlisted nondestructive techniques or technologies. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Duplex / Multiple Technology? | Two or more technologies are utilized within the same sensor, transducer or probe. In some duplex technology probes, the sensing technology employed for the measurement will automatically change with sample conditions. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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Application
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| Application | |||
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| Coating Thickness | The sensor or transducer can be used to measure the thickness of coatings such as paint, enamel, plating, etc. | ||
| Conductivity | Conductivity probes induce eddy currents in nearby surfaces with an AC current flowing through a coil. The magnitude and phase of the induced eddy currents will affect the loading on the coil and thus its impedance. Cracks can be detected when they interrupt the eddy current flow. Cracks must be positioned such that they interrupt the eddy current path; cracks parallel to the path will have little effect on the eddy current and thus the voltage across the coil. | ||
| Flaw / Crack Detection | Instrument or systems used to detect and measure flaws or cracks in a material or component. | ||
| Wall / Material Thickness | The probe can be used to measure, without destructive sectioning, the thickness of sheet materials, section or webs of parts and walls or tubing or pipe. | ||
| Weld Inspection | Probe specifically designed for detection of flaws and cracks in welded joints. | ||
| Other | NDT sensor or probe designed for other unlisted, proprietary or patented applications. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Probe Style / Type
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| Style / Type: | |||
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| Angled / Curved Tip | Probe style or type consists of a right angle or curved tip for flexibility in positioning and accessing difficult reach areas requiring inspection. | ||
| Disc Probe | A relatively large area disc probe head, usually mounted at right angles to the probe body. | ||
| Inside Diameter (Tubing / Holes) | I.D. or hole probes are inserted into holes meant for bolts or other fasteners to detect flaws or damage on the inside diameter of the hole. Tubing probe designed to be inserted into runs of tubing for nondestructive evaluation. Typical applications include inspection of heat exchanger or condenser coils. NDT probes designed for inspecting the inner diameters of tubes, boltholes or recesses in parts typically have a round shape or small size. The probes are often rotated manually or with a motor during the evaluation process. Manual probes are positioned and rotated by hand. Rotating hole probes have some type of rotational drive functionality, which may require a separate driver mechanism. | ||
| Outside Diameter (O.D. / Encircling) | Probe specifically designed to inspect the outside diameter of a rod or tube. | ||
| Pencil Probe | Generally a long, thin probe for manual positioning for a variety of inspection applications. | ||
| Ring Probe | Ring probes are designed to fit around the heads of fasteners such as screws or rivets to detect flaws or cracks in the fastener area. | ||
| Sliding | Meant for sliding or scanning across a surface, sliding probes often have low-profile bodies and the ability to test material areas below the top surface. | ||
| Surface Probe | Spot or surface probes are generally designed for flat surfaces and the detection of flaws, conductivity, and coating thickness measurement. They often have plastic lenses or faces to prevent marring during surface inspection. | ||
| Other | Specialized or non-listed probe or transducer type. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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| Array | Set of multiple probes or probe coils for simultaneous testing of multiple points. The probe may be used to replace a rotating hole probe, as it can measure several circumferential points at one time. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Replaceable / Detachable Tip | Tips are easily interchanged; may include detachability for tips of different type or different size. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Non-contact | The probe allows non-contact measurements to be made. | ||
| Search Logic: | "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice. | ||
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| Detection Format: | |||
| Your choices are... | |||
| Absolute | A single pickup coil for flaw and crack detection. Both gradual and sharp changes are detected. | ||
| Differential | The detection of two pickup coils is compared for a greater resolution of sharp discontinuities or flaws. The differential nature makes this type of probe less suitable for detection of gradual changes in material. | ||
| Search Logic: | All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches. | ||
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Specifications
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| Measurement Range | Measurement range is the depth into the material or the part or coating thickness that can be inspected with the NDT sensor or probe. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Accuracy | Accuracy is the variation or error of the probe or instruments readings from a calibration standard with a known agreed upon value. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Precision | Precision is the standard variation of the NDT probes measurements. Precision is also known as repeatability. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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| Diameter / Width: | Cross-sectional diameter or width of the probe or probe head used against the face of the surface or part wall to be inspected. | ||
| Search Logic: | User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria. | ||
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