What are the parameter values in the formula for calculating the sensitivity of Hall sensors? What a

Parameter value: Under the condition of direct voltage excitation, the output signal of the strain gauge tensile force sensor is a voltage signal in the mV range. This strain gauge.

The change in resistance is amplified by the Wheatstone full-bridge circuit of the output signal. In principle, this signal is proportional to the effective tensile force under certain conditions (fixed sensor sensitivity, fixed supply voltage).

Value: Linear Hall element.

In principle, from the perspective of principle, from VH=KHIB to VH=KHb, the unit becomes MV G, and the sensitivity is generally about 1 5mV G.

To put it simply, the original output of the sensor is an MV V signal. It is the output of the measuring resistor. For a sensor with a range of 10kg, when it is subjected to a force of 5kg, it is an output of 10mV V, and when the sensor is no-loaded, it is 0mv V, which is the output signal of the sensor and the excitation voltage of the sensor of V.

There will be a little drift of the sensor when it is unloaded. The most standard is yes, the full-scale is the most standard, and it will also drift a little.

Hall sensors are a type of magnetic sensor. It can be used to detect magnetic fields and their changes, and can be used in various magnetic field-related occasions. Hall sensors are based on the Hall effect and are integrated sensors composed of Hall elements and their ancillary circuitry.

Hall sensors are used in a wide range of applications in industrial production, transportation, and everyday life.

Hall Effect Hall Element Hall Sensor.

Hall effect. As shown in Figure 1, if the current i is controlled at both ends of the semiconductor lamellae, and a uniform magnetic field with a magnetic induction intensity b is applied in the vertical direction of the lamella, then a Hall voltage with a potential difference of UH will be generated in the direction perpendicular to the current and the magnetic field, and the relationship between them is as follows

where d is the thickness of the sheet, k is called the Hall coefficient, and its size is related to the material of the sheet.

The above effect is called the Hall effect, which was discovered by the German physicist Hall in 1879 when he studied the properties of current-carrying conductors subjected to force in a magnetic field.

Because the potential difference generated by the Hall element is very small, the Hall element is usually integrated with the amplifier circuit, temperature compensation circuit, and voltage regulated power supply circuit on a single chip, which is called a Hall sensor. Since Hall devices must use op amps, the sensitivity of Hall devices is often referred to not as the sensitivity of the device itself, but as the sensitivity including the op amp. In this way, you can only know one model by looking at the manufacturer's manual.

Switching sensitivity refers to the magnetic opening and closing window, that is, how much magnetic field is needed to make Hall on, and the smaller this value, the higher the sensitivity.

Linear sensitivity refers to the value of the output voltage change for each unit change in the magnetic field, and the higher the value, the higher the sensitivity.

When it comes to the device, it is the amplifier inside the IC that determines the sensitivity.

The formula for calculating the digital sensitivity is: ps = 10lg(kt) 10lg(bw) nf + snr.

The sensitivity is numerically equal to the slope of the output one input characteristic curve.

If there is a linear relationship between the output and input of the sensor, then the sensitivity s is a constant. Otherwise, it will vary with the amount of input.

The increased sensitivity results in high measurement accuracy. However, the higher the sensitivity, the narrower the measurement range and the less stable it tends to be.

Main features: The characteristics of the sensor include: miniaturization, digitization, intelligence, multi-functionalization, systematization, networking, it not only promotes the transformation and upgrading of traditional industries, but also may establish a new type of industry, thus becoming a new economic growth point in the 21st century.

Miniaturization is based on microelectromechanical system (MEMS) technology, which has been successfully applied to silicon devices to make silicon pressure sensors.

The sensitive element directly senses the measured and outputs a physical quantity signal that has a definite relationship with the measurement; The conversion element converts the physical quantity signal output by the sensitive element into an electrical signal; The conversion circuit is responsible for amplifying and modulating the electrical signal output by the conversion element; Conversion components and conversion circuits generally require an auxiliary power supply.

The sensitivity of a sensor can usually be calculated using the following formula:

Sensitivity = Amount of change The amount of signal output.

Among them, the change refers to the change of the physical quantity perceived by the sensor, such as the change of trapped mode, such as temperature difference, pressure change, etc.; The signal output is the electrical signal output by the sensor. For example, for a temperature sensor that perceives a change in temperature of δT and outputs an electrical signal of V, the sensitivity of the sensor can be expressed as:

Sensitivity = t v

The units of sensitivity are usually V, V kPa, etc. The higher the sensitivity, the more sensitive the sensor is to the changes in physical quantities, and the output signal changes are relatively greater.

Linearity δ=δymax yfs*100 where δymax represents the maximum amount of output value, and yfs represents full-scale output.

Calculation of sensor sensitivity smile:

1) The sensitivity is numerically equal to the slope of the output one input characteristic curve.

If there is a linear relationship between the output and input of the sensor, then the sensitivity is a constant. Otherwise, it will vary with the amount of input.

2) The dimension of sensitivity is the ratio of the dimension of output and input.

For example, if the output voltage of a displacement sensor changes by 1 mm and the output voltage changes by 200 mV, its sensitivity should be expressed as 200 mV mm. When the output and input dimensions of the sensor are the same, the sensitivity can be understood as the magnification.

The increased sensitivity results in high measurement accuracy. However, the higher the sensitivity, the narrower the measurement range, and the worse the stability.

First, the sensitivity of the Hall element KH is generally in. The sensitivity of the Hall element is directly proportional to the Hall coefficient and inversely proportional to the thickness δ of the Hall element, i.e., kh = Rh δ in mv (, which can usually characterize the Hall constant.

In addition, if it refers to the sensitivity value of the Hall experiment in university physics, it depends on the experimental equipment.

Second, Hall elements are semiconductors that apply the Hall effect. It is generally used to measure the rotor speed in the motor, such as the magnetic drum of the video recorder, the cooling fan in the computer, etc.; It is a magnetic sensor based on the Hall effect, which has developed into a variety of magnetic sensor product families and has been widely used.

The components in the sensor generally want to feedback information as quickly as possible, so the higher the sensitivity of the corresponding Hall element, the faster the information processed by the sensor!

The sensitivity of the pure sail sensor is basically fixed after it is made, and the measurement range of the sensor: the output of the linear sensor can generally be written as: y=a+bx; where y is the output of the sensor, x is the measured position, a is the zero position of the sensor, and b is the sensitivity of the sensor.

When measured as the upper limit of measurement xmax, 0 xmax is the measurement range of the sensor, in the measurement range, the above equation gives the theoretical working straight line of the sensor, but there is a slight deviation between it and the actual working curve, if its maximum deviation is δ, then the error of the sensor in the measurement range can generally be written as δ bxmax.

The sensor can be used only if the error is negligible for the user within the measurement range.

If you want to change the measurement range, that is, to change the value of xmax to a large or small value, you may still assume that the theoretical working line of the sensor is expressed in the above formula, but its actual operating curve will be changed; That is to say, if you change the measurement range, the maximum deviation δ of the liquid pants will also change, and the value of the full-scale output bxmax of the sensor will also be changed.

As a result, the measurement error of the sensor is changed; Usually this error will become larger, but if you are still acceptable, then you can adjust the range, and vice versa.

In practical application, you need to recalibrate the sensor after adjusting the range, and you can adjust the range if you can accept the error after recalibration, and not vice versa.