Laser Interferometer Basics Explained
Laser InterferometerHighly precise and rapid measurement capabilities make it a universal standard equipment for calibrating the accuracy and linear indicators of various positioning devices such as CNC machine tools and coordinate measuring machines. Mastery of the laser interferometer's operation technology significantly enhances the efficiency of measurement work.
Leveraging laser interferometry technology.
Rapid Targeting Method for Z-axis Laser
Compared to alignment along the x and y axes, achieving collimation using the z-axis for laser beam paths is more challenging. Particularly when the z-axis distance is longer, it usually takes a longer time to align the laser beam path to ensure that the intensity of the laser beam returning to the initial detector after reflection from the mirror meets the measurement requirements for light intensity.
The Axis Beam Quick Aiming Method is a specialized calibration technique: Place the Z-axis at the bottom, use the aiming groove in the middle of the laser housing, position the spectrometer on the Z-axis, move the Z-axis left and right, observe the Z-axis, ensuring the laser beam is parallel to the Z-axis after redirection, and move left and right (can be placed over the Z-axis) to ensure the laser hits the mirror.
Choose辅助tools.
Although the installation components of the laser interferometer are relatively complete, some additional auxiliary tools are still needed during actual use.
Development of a low-profile tripod.
Some machine tool workbenches are parallel to the ground. When measuring the Z-axis, the original tripod and the laser ground tripod may lose the measurement range due to their own height.
② Select Magnetic Base
Magnetic interferometers are commonly used auxiliary tools for laser interferometers. When selecting one, attention must be paid to ensure that the table base working surface has screw holes to match the installation of the mirror assembly. For the main magnetic suction surface, choose two types (laboratories and factories often use the main magnetic suction surface at the bottom) - one for the bottom and another for the side. During measurement, a side-suction table base is often more advantageous for the installation of the laser interferometer.
Flexible lens assembly usage.
It includes linear measurement mirrors, angular measurement mirrors, flatness measurement instruments, straightness measurement instruments, perpendicularity measurement instruments, and laser collimators, among others. In practice, different groups of mirrors with varying functions can be combined to meet measurement requirements. For instance, the reflecting mirrors in the angular measurement mirror set can also substitute for those in the linear measurement mirror set; using a laser collimation mirror can shorten adjustment time.
Additionally, various measurement lens groups can be used along with different measurement lens groups. Generally, a spectrometer or an optical right-angle prism is employed to alter the light path, facilitating measurement. This requires understanding the equipment's performance and mastering measurement techniques, applying them creatively while ensuring precision in measurement.
Equipping with computers is necessary.
Laserscanners are commonly used with laptops; however, if special issues are not addressed, software conflicts and computer viruses can impact measurements and usage.
What factors determine the accuracy of laser interferometry?
In fact, laser interferometers must determine the true precision level achievable for each measurement application to ensure the accuracy and reliability of the measurement data. Since the final reading of the laser interferometer system is related to the laser wavelength, the accuracy and stability of its frequency are guarantees of the precision of laser interferometer measurements. Additionally, the accuracy of the environmental condition compensation system (pressure, temperature and humidity sensors) directly impacts the measurement precision of the laser interferometer's Z terminal.
In summary, factors affecting the measurement accuracy of laser interferometers include: 1. Laser frequency (wavelength) and frequency stability; 2. Errors generated by the software system; 3. Errors in the mirrors and conical prism angles; 4. Errors from temperature, humidity, and pressure sensors; Of course, in specific measurement tasks, accuracy is also influenced by factors such as the measurer and on-site environmental conditions.
For laser interferometric measurement.
Lasers干涉ometers require supervision and must be inspected by a dedicated technician to ensure accuracy; they are not to be used arbitrarily by others to prevent degradation of precision.
The laser interferometer is stored in an environment requiring dryness, ventilation, vibration resistance, fog resistance, dust resistance, and rust prevention. The instruments must be kept dry. All instruments must not be pressed, frozen, wet, or heated. The instrument box should not be placed near a furnace or heating tube.
When using the laser interferometer, handle it with care to avoid strong impact vibrations. Check the stability of the tripod before placing it. Staff must not leave the instrument during the entire operation to prevent accidents.
Avoid laser interference measurements in environments with strong winds, humidity, and significant temperature changes, as this will severely affect the test results.
