What are the common problems of vibration sensors?
The component modules of the vibration sensor are encapsulated in the housing. During operation, it will be powered by a battery or a vibration generator to form a wireless vibration sensor network node. The network consists of randomly distributed micro-nodes integrating sensors, data processing units and communication modules.
vibration sensorThe network system usually includes sensor nodes, sink nodes and management nodes. In the process of vibration transmission, there may be problems such as zero output on site. According to the analysis of the vibration sensor manufacturer, the possible reasons for the error of the wireless vibration sensor are as follows:
1. When the vibration transmitter input is zero
a. Check whether the polarity of the power supply can be reversed. B. Short-circuit the test terminal and check the 2-pole tube in the shell.
2. When the vibration transmitter fails to communicate
a, Check supply voltage on transmitter B. Check load resistance C. Switch electronic circuit board
3. When the vibration transmitter reads high or low
a. Check the vibration variable reading B. Stop the 420mA input adjustment C. Replace the electronic circuit board D. Check the vibration output E. Check the inspection equipment F. Stop the sensor adjustment
4. When there is no response to the input vibration of the vibration transmitter
a. Check the power supply voltage of the transmitter B. Check the inspection equipment C. Correct the calibration set point (4 and 20mA points) d. Replace the electronic circuit board
5. When the vibration transmitter reads irregularly
a. Check whether the vibration output can be blocked. B. Check whether the electromotive force interferes with the wireless vibration sensor
6. When the vibration is output, do not increase the input of the vibration transmitter, do not change the input of the vibration transmitter, and then suddenly change the input of the vibration transmitter, so it cannot return to the zero position of the vibration transmitter.
a, If the power supply and output of the vibration sensor can be replaced, check whether the vibration sensor is normal, and then check whether the input and output of the vibration sensor are damaged. At first, I am looking at whether it is the surface damage or the result of other links in the whole system.
7. The input signal of the vibration transmitter is unstable
a. The vibration source itself is a stable and fluctuating vibration B. The anti-interference ability of the surface or vibration sensor is not strong C. The sensor wiring is not firm D. The sensor itself vibrates violently e. The shortcomings of the sensor
8. There is no input when the pressure transmitter is powered on
a. Wrong wiring (the surface and the sensor should be checked) B. The wire itself is broken or shorted C. No input or power mismatch D. The surface is damaged or the surface does not match E. The sensor is damaged
The vibration sensor node is compact in structure and small in size. It consists of a power supply module, an acquisition and processing module and a wireless transceiver module, and is packaged in a polyphenylene sulfide plastic case. Each channel of the node is equipped with an independent high-precision 120-1000Ω bridge Resistance and amplification conditioning circuit, can be easily and automatically switched by software, select the measurement mode of 1\/4 bridge, half bridge and full bridge, and compatible with various types of bridge sensors, such as strain, load, torque, displacement, acceleration, , pressure, temperature, etc. The node supports both 2-wire and 3-wire input modes. The bridge is automatically balanced and can also be stored in the node’s built-in 2m data memory. The effective outdoor communication distance can reach 300 meters, and it can continuously measure for more than 10 hours .
1. Low power consumption design
All modules are designed with ultra-low power consumption. The current consumption of the entire sensor node is very low. It can work for several years with 2 ordinary dry batteries, which greatly prolongs the maintenance cycle. Therefore, the micro-vibration generator can also use the piezoelectric principle to collect structures The weak vibration energy generated is converted into electrical energy and powers the sensor. In order to reduce power consumption, the sensor chooses ultra-low power consumption products, and the sensor turns off the power or puts it in sleep mode when it is not collecting. It is truly maintenance-free.
2. Time synchronization
The sensor is based on the TDMA transmission protocol of time synchronization and fixed routing table, which can realize "simultaneous" sleep and "simultaneous" wake-up, which is suitable for online monitoring and detection of sensor industrial automation.
1. Low power consumption design
All modules are designed with ultra-low power consumption. The current consumption of the entire sensor node is very low. It can work for several years with 2 ordinary dry batteries, which greatly prolongs the maintenance cycle. Therefore, the micro-vibration generator can also use the piezoelectric principle to collect structures The weak vibration energy generated is converted into electrical energy and powers the sensor. In order to reduce power consumption, the sensor chooses ultra-low power consumption products, and the sensor turns off the power or puts it in sleep mode when it is not collecting. It is truly maintenance-free.
2. Time synchronization
Based on the TDMA transmission protocol of time synchronization and fixed routing table, the sensor can realize "simultaneous" sleep and "simultaneous" wake-up, which is suitable for online monitoring and detection of wireless sensor industrial automation.
Wake up mode for vibration sensor
In a sensor network, nodes wake up in the following ways:
(1) Full wake-up mode: In this mode, all nodes in the sensor network wake up at the same time to detect and track targets in the network. Although high tracking accuracy can be obtained in this mode, it is at a huge cost at the expense of network energy consumption.
(2) Random wake-up mode: In this mode, the nodes in the sensor network wake up randomly with a given wake-up probability P.
(3) The wake-up mode is selected by the prediction mechanism: in this mode, the nodes in the sensor network selectively wake up those nodes that benefit greatly from the tracking accuracy according to the needs of the tracking task, and predict the next step based on the snapshot information. Time the state of the target and wake up the node.
(4) Task cycle wake-up mode: In this mode, the nodes in the sensor network are periodically in the wake-up state. Nodes in this working mode can coexist with nodes in other working modes and assist nodes in other working modes