1) Pay attention to the structure and data of the object to be measured, and the general laser displacement sensor needs to measure the triangular optical path with intact requirements. If the measured object has deep grooves or messy appearance, it may cause the triangular light path to be occluded, so that it cannot be measured. There are also some light-absorbing materials, such as black rubber and other materials, most of the light intensity will be absorbed, so it is necessary to reasonably adjust the exposure time to meet the measurement signal. Other strong reflections, or specular reflection of the measured object, may cause the light to return vertically without forming a diffuse reflection, and will also lead to unsafe measurement. Therefore, when using laser displacement sensors, we must first communicate with the manufacturer, and do not take it for granted that it can be measured artificially, but the results are not good. At present, international mainstream laser displacement sensor brands, such as Miiridium in Germany and Keyence in Japan, will require customers to inform the appearance structure and reflective characteristics of the object under test in advance when selecting laser displacement sensors. If it is a special test material, such as glass, rubber and dark lines on the surface, it may be necessary to provide samples for trial testing to ensure that the measurement requirements are met before ordering.
2) Parameter selection, many manufacturers provide multiple levels of laser displacement sensors for customers to choose. The target commonly used to select laser displacement sensors includes the accuracy of the sensor, which also has other designations such as linearity, absolute error, etc. It refers to the degree of deviation of the measured value of the sensor from the theoretical real value. This parameter directly resonates with the measurement of quasi-forbidden. The second is resolution, which refers to the minimum displacement change required by the sensor to change the number of displays, and the general resolution parameter value is less than the accuracy. The third is the measurement speed, taking Germany Miiridium optoNCDT as an example, its measurement speed can reach 49kHz, and the measurement speed directly determines whether the measurement can keep up with the change speed of the measured object, and whether it can well reflect the whole process of displacement change. Oscillation measurement is common in occasions with high requirements for measurement speed. Of course, there are many parameters that determine the performance of the sensor, including the ability to withstand ambient temperature targets, oscillation and shock targets, and so on. Why choose the right target? Because the higher the skill parameters, it must mean that the manufacturing process is more messy and difficult, and it is also bound to be expensive. Therefore, when you formulate measurement requirements, you must not imagine and put forward a super high measurement requirements. I have seen some sensor application units, often require a few microns, or even nanometer level measurement accuracy, the measurement speed is still super high, ask it is really necessary to put forward such a high requirements? Responses are often unnecessary and may require high margins. But everyone should remember that there is no such thing as a no-cost goal increase, and every high goal is backed by a payment of real money. When selecting other laser displacement sensors, it is important to pay attention to the fact that each manufacturer has different standards for the indication of parameters. For example, Germany brands are generally marked with real parameters, or even conservative parameters. For Japanese brands, when labeling, the uniform result will prevail. When looking at the parameter table, take a closer look at the small print below, the ultra-high parameters of Japanese brands often come from the results of repeated uniformity. Optical measurement will produce some burrs, and the measurement results can be greatly smoothed out by a uniform method.
3) The selection of brands, among the displacement sensors with many measurement principles, the laser displacement sensor market is the most chaotic, and the brand is the most uneven. Even some businesses are obviously only acting for a foreign brand, but claim that they are the original factory production, and when there is a problem in the future, because the early skill program has been finalized, it can only be adopted head-on, and this will often bring greater problems in the future. To identify whether a brand is the original product, in addition to the common original factory certificate (this can also be impersonated), the most direct is to look at its Chinese website, foreign brands will generally use their own brand title as the website, if you see a brand URL is a mixture of Chinese and English, it is unlikely to be a regular manufacturer. The Chinese website of other formal imported brands must be found on the website of their foreign parent companies, and what cannot be found must not be a subsidiary. The selection of the brand is particularly critical, because theoretically speaking, the structure of the laser displacement sensor is not messy, and small domestic factories can also make it, but the accuracy and repeatability are very different from those of big brands. In addition, the service life, temperature drift, etc., will also greatly affect the customer's application role. I have seen some use of manufacturers, for a few hundred yuan price difference, from the imported brand to the domestic brand, the results of the past 3 years will not be broken a sensor, a year broken 4 times, calculated more expensive not counted, but also greatly affected the use of links, the production line stopped once, but not hundreds of dollars of cost savings can be compensated.
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