Update: 2020-04-29 11:44 Source: LUFTMY
Smart technology is everywhere in modern life, and these smart technologies cannot be separated from sensors.For example, the current shortage of forehead heat guns during the outbreak contains thermopile sensors, and some household appliances that let people free their hands, such as vacuum cleaners, robot cleaners and dishwashers, contain many sensors.In the process of selecting the sensor, we need to know our product requirements, according to the product specifications of the sensor, performance attributes to choose, next talk about some common sensor selection errors.
The first myth: the more sensitive the sensor, the better
In our opinion, high sensitivity value usually means higher working efficiency.But is this criterion accurate?Technically, the value of the output signal corresponding to the measured change is larger only if the sensor remains highly sensitive, which may be more conducive to signal processing.Therefore, from this point of view, the higher the sensitivity of the sensor, the better.
However, we can not ignore another problem: as the sensor sensitivity improves, the conditions unrelated to the object under test will be introduced into more areas, and as the sensitivity improves, will continue to magnify.Such a result will eventually have many adverse effects on the measurement accuracy.Therefore, high sensitivity sensor is definitely an aspect that we need to pay attention to, but we can't blindly pursue high sensitivity.
Therefore, for the selection of sensor sensitivity, Luftmy gives the following Suggestions: for the sensor, its sensitivity is directional, when the measurement is a single vector, and its direction requirements are high, we do not need other sensors with lower sensitivity.When measuring multidimensional vectors, we need to choose a sensor with low cross sensitivity.It can be seen that the higher the sensitivity of the sensor, the better.
Second myth: the higher the accuracy of the sensor, the better the effect
The precision of the sensor is another important index to judge its characteristics.But does the accuracy of the sensor have to be high?For sensor technology applications, more accurate products usually mean higher prices.Only the high end price can meet our measurement needs?Or, how do we manage our needs?
In fact, if our measurement demand is relatively constant, we only need to choose relatively high precision and relatively cheap sensors, rather than the more expensive high-end products.Of course, if it is used for quantitative analysis or has higher requirements for measurement, then we must choose a more accurate sensor to satisfy our application.Therefore, clarifying our measurement requirements can make the sensor we choose more specific and save costs to a certain extent.
In a word, it is not the most expensive sensor with the best sensitivity and the highest precision that is the best sensor, and the combination of product requirements to choose the most suitable is the right choice!