What is a discriminator on a metal detector?
Abstract—Metal discriminators are electronic devices which can detect the presence of metal and discriminate the type of metal.
How does a metal detector discriminator work?
DISC works through the same process by which normal metal detection does. The eddy currents produced within the object are first detected by a second coil. These signals are then processed and then amplified to create the sound which lets you know metal has been detected.
How do I increase the sensitivity of my metal detector?
To maximize sensitivity the smallest possible aperture size should be used. Optimum aperture size will be dependent upon the products being inspected, and in the case of conveyorized inspection, the dimensions and orientation of the product on the belt.
What is the best operating frequency for a metal detector?
The best frequency for metal detecting is somewhere in the range of 5 kHz to 15 kHz. This range is where most general-purpose metal detectors are tuned too, and also the easiest to manage for beginners. Nevertheless, you can always get more specialized detectors once you have mastered the basics.
What is a discriminator detector?
FM Demodulation Detection. FM detectors are circuits that instantaneously convert the frequency changes from the carrier signal to its output voltage counterpart. They are also known as frequency demodulators or discriminators.
What is the notch setting on metal detector?
NOTCH: Provides an adjustable rejection “window” to eliminate undesirable metals from detection. Move the rejection “window” with the DISC/NOTCH knob.
In which position the sensitivity of the metal detector is least?
centerline axis
The centerline axis is the least sensitive point and therefore this is where performance testing should take place. As metal gets closer to the sides (and coils), the signal it generates gets larger, making it easier to detect.
What does mid range mean on a metal detector?
Mid. -range objects cover a large variety of metals. Among them are: pull-tabs from beverage containers, nickels, medium-sized gold objects, some types of aluminum, and zinc.
What is the frequency discriminator?
A frequency discriminator is defined as a converter of frequency changes into amplitude changes. Discriminators are used in various applications, one of which is the direct demodulation of fre- quency modulated signals [1, 2]. Mixing a broad- band signal down to an intermediate frequency, can be a tedious job.
What does discrimination mean on a metal detector?
Discrimination is the metal detector’s ability to differentiate between types of metallic alloys, according to WhitesElectronics.com. Setting your discrimination filter appropriately will greatly increase your chances of finding that buried treasure that you’re looking for. Identify your detector’s discrimination settings.
Do you need to know the settings of a metal detector?
If you find what works for you, stick with it. If you run into different ground conditions, do different types of metal detecting or just want to get the most out of your metal detector then it pays to learn the settings, what they do and how they effect your metal detector.
What does the disc mean on a metal detector?
Metal detector discrimination or DISC is a feature, commonplace among relatively newer metal detectors, by which certain metals can be ignored as to avoid common but low value objects.
Can a metal detector filter out unwanted items?
To avoid this common occurrence, some metal detectors are equipped with discrimination settings to filter out unwanted items.