Metal detector based on the principle of an electronic frequency meter, theory. Scheme, description

Free technical library

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Metal detector based on the principle of an electronic frequency meter, theory. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / metal detectors

Comments on the article

The development of measuring electronics, and especially with built-in microprocessors, now allows you to take a different look at metal detectors, the principle of operation of which is based on measuring the frequency deviation of the measuring oscillatory circuit.

Modern technical means make it possible to implement a compact device that allows real-time estimation of small frequency deviations of the measuring generator with high accuracy. And although an electronic metal detector built according to this principle is an undoubted relative of a "beating" device, it deserves to be singled out as a separate class of devices that can be called metal detectors based on the principle of an electronic frequency meter. Devices of this class, in addition to the mass of service capabilities of microprocessor implementation, have one more fundamental difference from the simplest devices "on beats" - the possibility of estimating the sign of the frequency increment.

Considering that a ferromagnetic target usually leads to a decrease in the frequency of the "measuring oscillator, and a target made of non-ferromagnetic metal - to an increase, we get a wonderful opportunity to select targets according to the type of metal. In addition, this class of devices is practically not subject to the parasitic synchronization effect described above, since the frequency of the measuring oscillator and the frequencies of other auxiliary signals (microprocessor clock frequency) are very different, thus increasing the sensitivity.

The positive side for practice is the simplicity of the design of the sensor and the electronic part of metal detectors based on beats and on the principle of a frequency meter. Such a device can be very compact. It is convenient to use it when something has already been detected by a more sensitive device. If the discovered object is small and deep enough in the ground, then it can be "lost", move during the excavation.

In order not to "look through" the excavation site with a bulky sensitive metal detector many times, it is desirable at the final stage to control their progress with a compact short-range device, which can more accurately find out the location of the object.

Author: Shchedrin A.I.

See other articles Section metal detectors.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Pumping water into the ocean 09.11.2011

The level of the oceans in our time is rising by about three millimeters per year. This increase is mainly due to global warming, due to which the ice of the Arctic and Antarctic is melting. But a significant contribution is made by the pumping of water from underground aquifers.

This was announced at a conference held in August 2011 in Prague, American hydrologist Leonard Konikov. Since 1900, the volume of groundwater consumed has been growing, and the depth of artesian wells has been increasing. Partially replenished by seeping rainwater, but over the past 110 years, about 4500 cubic kilometers more water has been pumped out of the ground than returned there.

Ultimately, this water ends up in the seas and oceans, as a result of which their level has risen by 1900 millimeters since 12,6. In the last decade, about 145 cubic kilometers of water have been pumped out per year, causing sea levels to rise by half a millimeter per year - 13% of the total level increase.

Other interesting news:

▪ Meteorites in limestone

▪ Mystery of the Chameleon Spider

▪ Bigger brain - higher risk of mental illness

▪ SONY ELECTRONICS pays for past mistakes

▪ Advertising on the smartphone screen additionally drains the battery

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Standard instructions for labor protection (TOI). Selection of articles

▪ article Korolenko Vladimir Galaktionovich. Famous aphorisms

▪ Biology article. Big encyclopedia for children and adults

▪ Passionflower article. Legends, cultivation, methods of application

▪ article Low harmonic signal generator. Encyclopedia of radio electronics and electrical engineering

▪ article Burnt map. Focus secret

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews