What is a sensor in NDT?

In the field of non-destructive testing (NDT), a sensor plays a crucial role in detecting and measuring various physical parameters associated with the material or component being inspected. A sensor, in simple terms, is a device that converts a physical quantity or property into an electrical signal that can be interpreted and analyzed.

In NDT, sensors are utilized to capture and transmit data about the material’s characteristics, such as its thickness, temperature, conductivity, or the presence of defects. These sensors come in different forms and types, depending on the specific NDT method being employed. Let’s explore some common types of sensors used in NDT.

Ultrasonic Transducers

Ultrasonic transducers are a type of sensor used in ultrasonic testing (UT) for non-destructive evaluation of materials. They play a critical role in generating and receiving ultrasonic waves, which are used to detect and characterize defects, measure thickness, and evaluate material properties.

Eddy Current Probes

Eddy current probes, also known as eddy current sensors or eddy current coils, are electromagnetic sensors used in eddy current testing (ECT). They are a type of non-destructive testing (NDT) sensor designed to detect and evaluate surface and near-surface defects in conductive materials.

Magnetic Sensors

Magnetic sensors are devices that are used to detect and measure magnetic fields. They are utilized in various applications, including navigation systems, position sensing, proximity detection, and non-destructive testing. Magnetic sensors operate based on different principles and technologies, each suited for specific applications.

Radiographic Detectors

Radiographic detectors are devices used in radiography and radiographic imaging to capture and convert radiation into visible or digital images. These detectors play a crucial role in medical imaging, industrial testing, and security screening applications

Thermographic Sensors

Thermographic sensors, also known as thermal sensors or infrared sensors, are devices used to detect and measure thermal radiation or infrared energy emitted by objects. These sensors operate in the infrared wavelength range, which is beyond the range of human vision. They are widely used in various applications, including temperature measurement, thermal imaging, and night vision.

Visual Inspection Sensors

Visual inspection sensors, also known as machine vision sensors, are devices used to capture and analyze visual information to perform automated inspection and quality control tasks. These sensors use cameras and image processing algorithms to detect and analyze objects, patterns, and features within a visual scene. Visual inspection sensors are widely used in industries such as manufacturing, robotics, and automation.