How to calculate the absolute phase of force sensor experiment

1.

What is the meaning of conversion coefficient K of force sensor

A: its meaning can be expressed as the average value of reading change for each additional weight

example:

the conversion coefficient of the force sensor is calculated by the successive difference method

if it is an even number, it is directly divided into two groups: suppose there are eight data, which are divided into (1,2,3,4) and (5,6,7,8), and the corresponding values of the former group are subtracted from the latter group, such as 5-1,6-2; Then add these differences, divide them by 4 (each group has 4 data), and then divide them by a 4 (= 5-1 = 6-2 = 7-3 = 8-4). You can get what you want. If you give it meaning, it can be expressed as the average value of reading change for each weight added. If the number of experiments is odd, you just need to reuse the middle number. For example, there are 7 groups of data, 1,2,3,4,5,6,7, and the components are divided into (1,2,3,4) and (4,5,6,7). Just divide by 4 (each group has 4 data), and then divide by 3 (= 4-1 = 5-2 = 6-3 = 7-4). The application condition of the successive difference method is that the independent variable changes at equal intervals (such as reading data at equal intervals on the screw rod or screw micrometer), and the function relationship is linear. When the function relation is nonlinear, it can't be dealt with by the successive difference method. In addition, it must be remembered that when using the successive difference method, the data measured at equal intervals should be divided into two groups in half, so that the calculation results are more accurate

2. You don't need Limin. What area do you use to measure this lile? As long as the surface of the sensor has a certain area, attached to the liquid surface, lift up, measure the force divided by the attached area is the tension coefficient. This is the simplest. I didn't think of a more economical way.

3. You don't need Limin. What area do you use to measure this lile? As long as the surface of the sensor has a certain area, attached to the liquid surface, lift up, measure the force divided by the attached area is the tension coefficient. This is the simplest.

4.

The basic characteristics of the sensor refer to the relationship between the output and input of the sensor, which is divided into static characteristics and dynamic characteristics

When the input of the sensor is a steady state signal or a very slow changing signal (often called static signal), static parameters can be used to describe and characterize the static characteristics of the sensor. When the input of the sensor is periodic signal, transient signal or random signal (often called dynamic signal), dynamic parameters can be used to describe and characterize the dynamic characteristics of the sensor

The ideal sensor should have a single value and definite output input relationship, and its output quantity should reflect the change of input quantity without distortion no matter in the static quantity or dynamic quantity input

3. When the static characteristic sensor is measured in a stable state, the relationship between output quantity and input quantity is called static characteristic. The basic requirement for the static characteristics of the sensor is that the output should keep a certain corresponding relationship with the input. The sensitivity of a sensitivity sensor refers to the ratio of the output variation to the input variation in a stable working state

5. The sensitivity of the sensor is a fixed value. When the zero point is calibrated, the sensor is not empty, that is to say, it is under a little force. After the calibration, the measured value is displayed with the state of zero point calibration as the reference zero point. If the ratio of this force to the rated range of the sensor is very small, it's OK. Simple example: when calibrating the electronic weighbridge, it is impossible to remove the weighbridge and then calibrate the sensor separately, that is, to get a car with known weight.

6. Generally expressed in MV / V, the higher the value is, the higher the sensitivity is.
for example, if the power supply is 10V, the general output is 20mV.
the sensitivity is 2mV / v

7. Because, when the output maximum value U1, it is not in the "temporary off state", when the liquid film is thicker, the liquid film weight is larger. The calculation method in the book requires "ignoring the weight of liquid film", so it will bring experimental error. The calculation results show that the relative error is 1% ~ 2% larger than that of the measurement in the critical off state.

8. The calibration of the force sensitive sensor before the experiment is to ensure the accuracy of the experimental data
wrong data will lead to completely opposite experimental conclusions.

9. It was unstable at first
there are many kinds of force sensors, such as piezoelectric sensors and piezoresistive sensors, which directly convert force into electricity, and those which are converted into electricity by elastic sensitive elements, such as resistive sensors, capacitive sensors and inctive sensors. It is mainly used in two aspects: force measurement and weighing
mainly divided into the following categories:
1, strain sensor
2, inctive sensor
3, capacitive sensor
4, piezoelectric sensor