Metal detector sensitivity
Sensitivity is a measure of a metal detector’s ability to detect a specific type and size of metal contaminants. The better the sensitivity of the metal detector, the smaller the irregularly shaped pieces of metal it can detect. Performance is usually expressed in terms of the diameter of a test ball made of a specific type of metal, such as ferrous or non-ferrous metals, aluminum or stainless steel. The more sensitive a metal detector is, the smaller pieces of metal it can detect. It’s an obvious example, but one that is complicated by a number of factors.
We regularly refer to the diameter of the sphere size when discussing detection sensitivity. For example, a highly sensitive detector can detect a 0.6 mm iron ball. The effect of ball size is small but in reality, metal pollutants can be much larger. Therefore, small changes in ball size detection can produce large changes in the volume of metallic contaminants that can be found.
How is the sensitivity of a metal detector measured?
When measuring the sensitivity of a metal detector, the test piece must be reliably detectable when passed through the center of the metal detector aperture. However, there is a significant difference between the spherical sensitivity of the test piece and the actual length of the irregularly shaped or wire-type contaminants that can be detected. A number of factors can affect the sensitivity of a metal detector. There are a number of factors that affect the detection sensitivity of metal detectors and the ability to find different types of metal. It is important to understand these factors to get the most out of your metal detection software.
An HACCP audit may identify hazards of different types of metals, including iron, non-ferrous steel, and stainless steel. However, the sensitivity of a metal detector can vary depending on the type of metal contaminants present. Iron is usually the easiest to detect, and stainless steel is the hardest to detect. However, as with many “rules” there are exceptions to this.
The ability of a metal detector to identify non-spherical contaminants such as wires or trenches, is determined in part by the type of metallic contaminant (ferrous, non-ferrous, or stainless steel), as well as the orientation of the metal object. The steering effect is observed only when the cross-sectional area of the contaminant (i.e. wire diameter) is less than the spherical sensitivity of the metal detector.
Factory conditions can also affect the performance of a metal detector. It is important to use a metal detector that has a built-in noise and vibration immunity to reduce the risks of airborne electrical interference and local factory vibrations affecting the metal detector.
Some products are electrically conductive and therefore behave in the same way as metal when passing through a detector. For example, products with a high content of moisture or salt such as meat and poultry, exhibit this phenomenon, often referred to as the “product effect”. The latest innovative metal detection solution, which combines multiple simultaneous frequency and product signal suppression technology is able to overcome this problem by reducing the active product signal.
What affects the sensitivity of a metal detector?
External electromagnetic interference: When the detector has external electromagnetic interference, it will disrupt the detector circuit. The main aspects affected are discrimination and ground balance. There is electromagnetic induction and radiation emitted by things such as power lines, thermostats, radio or television stations, or electric motors. If the storm is rolling in, the natural electricity produced can interfere with the signal as well. If you experience this, you will hear scrambled sounds or many false signals. When this is the case, try lowering your frequency. It may limit the range of your detectors, but it won’t make any unwanted noise.
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