The difference between high frequency and ultra-high frequency rfid /nfc technology rfid (Radio Frequency Identification) is a non-contact automatic identification technology. NFC technology integrates contactless card reader, contactless card and point-to-point function on a single chip, and relies on the card reader equipment to provide power by providing inductive RF coupling, so that the chip does not need power supply.
At present, high-frequency and induction heating technologies have the highest heating efficiency, the fastest heating speed, low consumption and environmental protection. It is widely used in hot working, heat treatment, hot assembly, welding and smelting of metal materials in all walks of life. It can not only heat the whole workpiece, but also heat the workpiece locally. It can realize deep heat penetration of the workpiece, or it can only heat the surface and surface layer centrally; Not only can metal materials be directly heated, but also nonmetal materials can be indirectly heated. Wait a minute. Therefore, induction heating technology will be widely used in all walks of life.
High frequency refers to radio waves in the frequency range of 3MHz to 30MHz. High frequency is mainly used for civil radio broadcasting and short wave broadcasting. It has weak resistance to the radio waves emitted by electronic instruments, so it is often disturbed.
Is there a difference between high frequency circuit and radio frequency circuit? The frequency of electromagnetic waves that can be effectively transmitted into space by RF transmitter through antenna is collectively called RF. If the frequency is too low, the effectiveness of transmission is very low, so the radio frequency traditionally refers to the frequency above 100 KHz.
High frequency refers to the short-wave band with a frequency of (3-30)MHz and a wavelength of (100- 10) m, which is obviously only a part of radio frequency.
What's the difference between high frequency, radio frequency and microwave? Radio frequency-the frequency at which radio waves can be emitted. Generalized high frequency-equivalent to radio frequency.
Narrow sense of high frequency-the frequency in the range of ——3 MHz to 30 MHz is a frequency band in radio frequency, belonging to short-wave frequency band, and the wavelength is between 10 m and 100 m.
Microwave-300 MHz ~ 300 GHz electromagnetic wave is a frequency band in radio frequency, and its wavelength is between1mm ~1m.
What's the difference between radio frequency electrotome and ordinary high frequency electrotome? It is mainly the difference of frequency and waveform that determines the difference of working principle and effect. The working frequency of medical RF-grade high-frequency electrotome is 1.5 MHz-6.0 MHz, and the working frequency of ordinary high-frequency electrotome is 450 kHz-650 kHz. When the common high-frequency electrotome cuts, it needs to apply a certain mechanical force, which is easy to cause large wounds; If the temperature is high, it will cause tissue carbonization or protein degeneration, and the wound will heal for a long time. Mainly used for major surgery. Radio frequency electrotome, its working principle is that the working end of the electrode outputs high-frequency electromagnetic wave (not current), which is generally higher than 1.5MHz (for example, the product frequency of Greelembo is 4MHz) and is concentrated in a small area through the electrode. Because there are a large number of water molecules in cells (water molecules are polar molecules, which are affected by electromagnetic waves), under the action of this regional high-frequency electromagnetic field, water molecules oscillate rapidly, hitting the cell wall and breaking it. Radio frequency has no current, so there is no need for a negative plate, but electromagnetic waves still need to be formed between the neutral plate and the electrode, but the electrode plate does not need to be in direct contact with the human body. It can be placed on a cloth sheet or clothes, or it can be placed far away from the operating area.
What's the difference between radio frequency electrotome and high frequency electrotome? The working frequency of common high-frequency electrotome is about 500KHz. In single-stage surgery, high-frequency current flows back to the main machine through the surgical electrode, human body and neutral plate, and conductive neutral plate is generally used. In bipolar surgery, high-frequency current flows back to the main machine through the surgical site between the two ends of bipolar electrocoagulation forceps.
The working frequency of radio frequency electrotome is 2000KHz-4500KHz, and the skin effect of current is very strong. In single-stage surgery, the insulated neutral electrode can be used to restore the current, and the human body does not need to be in close contact with the neutral electrode, which can completely avoid accidents such as electrode burn. Ultra-high frequency current is especially suitable for minimally invasive surgery in panel department, such as beauty, neurosurgery, ophthalmology, facial features, plastic surgery and so on.
What's the difference between high frequency electrotome and radio frequency electrotome? The main frequency of high-frequency electrotome is about 500KHz, such as GD350-B, B4A and B5 in Shanghai Hutong, and the power is about 350W. The main engine of RF knife works at a frequency above 4MHz, and its power is about 350W. The higher the working frequency, the better the skin effect of current. When high-frequency current acts on the surface tissue, the damage to the deep tissue of human body is less, such as GD350-E machine in Shanghai Hutong.
The specific difference between low-voltage inverter and high-voltage inverter is simply that the low voltage is 220 V-500 V
The high voltage is 500V-690V, or even higher.
What is the specific difference between receive and aept in English? What's the difference between bright bright bright? What is the specific difference between shining shine? Recive, aept and take take all mean "accept".
Accepting only means passively accepting.
Then he wrote to tell me that I would get 100 extra income every year!
Later, he smiled and told me that I charged 100 a year!
If you receive such a request, you can't disobey!
If you receive such a request, you will not disobey!
Babies can only accept sensory impressions, but they cannot understand them.
Babies can only accept sensory impressions, but can't understand them.
She received his gift, but she won't accept it.
She received his gift, but she won't accept it.
Aept always means positive and happy acceptance.
The villagers told him that even if he gave the inn to others, they would not accept it.
The villagers told him that even if he gave the pub away for nothing, no one would accept it.
There is no accepted theory to explain this phenomenon.
There is no accepted theory to explain this phenomenon.
The acceptance expressed by take contains the meaning of being given by someone.
Did you accept his suggestion?
Did you accept his suggestion?
He accepts anything given to him.
Give him what he wants.
Nobody takes my instruction?
Is it so hard that no one listens to my orders?
What's the difference between RF ic and RF? 1, RF is the abbreviation of radio frequency, which means electromagnetic frequency that can be radiated into space, and the frequency range is between 300 kHz and 30 GHz. RF RF is short for RF current, which is the abbreviation of high frequency AC electromagnetic wave. Alternating current that changes less than 1000 times per second is called low-frequency current, and that that changes more than 10000 times is called high-frequency current, and radio frequency is such high-frequency current. High frequency (greater than10k); Radio frequency (300K-300G) is the higher frequency band of high frequency; Microwave band (300M-300G) is the higher frequency band of radio frequency.
2. RF IC (integrated circuit) refers to an integrated circuit chip that works in the RF band and realizes specific RF functions.