Laser measurement (Frequency Modulated Continuous Wave, or FMCW) is a laser measurement technique commonly used to measure distance and speed. The following is a detailed description of the principle, advantages, disadvantages and characteristics of FMCW laser measurement, as well as its application landscape and industry.
1. Principle of FMCW laser measurement:
FMCW laser measurement technology is based on the principle of frequency modulated continuous wave (FMCW), which applies a more linear frequency modulation signal to the laser output beam, usually a linear ramp or nonlinear swing signal. This modulating signal is sent to a ranging device (e.g., a nanoscale translator mirror or a gigahertz microwave electronics generator), and the difference in frequency between the signal returned by reflection and the transmitted signal can be used to measure the object's distance from the laser.
The procedure is as follows:
a. Emitting the laser beam: The laser emits a laser beam and applies a frequency modulation signal to the laser beam.
b. Receive the reflected signal: the laser beam shines on the target object and reflects back to form the laser signal reflected from the object. c. Mixer processing: the frequency modulation signal is transmitted from the laser beam to the target object.
c. Mixer Processing: Mix the transmitted and reflected signals to obtain the frequency difference.
d. Distance calculation: using the frequency difference and the slope or pressure swing range of the modulating signal, combined with the speed calculation, the distance from the target object to the laser measurement system can be obtained.
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2. FMCW laser measurement advantages, disadvantages and characteristics:
- Advantages:
a. High Accuracy Measurement: FMCW laser measurement technology has high measurement accuracy and is capable of achieving sub-millimeter or even sub-nanometer distance measurement accuracy.
b. High Measurement Speed FMCW laser measurement technology uses continuous wave signals, which can realize high-speed measurements, suitable for application scenarios that require rapid data acquisition Adaptability: Due to the different reflective properties of laser light from different objects, FMCW laser measurement technology can adaptively adjust the ranging range and detection sensitivity when reflecting on the surface of different objects.
c. In FMCW LIDAR, even the optical lens and scanning components can be chip-enabled in the most ideal case.
- Disadvantages:
a. Complex system: FMCW laser measurement technology requires complex hardware and signal processing algorithms, which are more costly compared to other measurements.
b. Influenced by the environment In certain environments (e.g., bright light, rain, snow, gray, etc.), the laser beam may be disturbed, affecting the accuracy of the measurement results.
FMCW Laser Distance and Vibration Sensor
Vibration Measurement Technical Parameters
Distance Measurement Technical Parameters
- Characteristics:
a. Non-contact: FMCW laser measurement technology is a non-contact measurement method, no need to contact with the object can be measured, suitable for non-destructive sample application scenarios.
b. Fully electronic: FMCW laser measurement system can realize fully electronic control and data processing, easy to integrate and automation control.
3. FMCW laser measurement application scenarios and industry:
FMCW laser measurement technology is widely used in the following fields:
a. Industrial automation: e.g. robot navigation, localization and measurement, material processing and inspection, dimensional inspection on automated production lines.
b. Remote sensing mapping: for terrain modeling 3D reconstruction, Geographic Information Systems (GIS), surveying and monitoring applications.
c. Automotive industry: e.g. vehicle seating position detection, intelligent driver assistance systems, driving safety assistance technologies, etc.
d. Energy and environment: for measuring wind speed, atmospheric pollutant measurement, etc.
e. Medical field: such as visual inspection, surgical navigation tissue and blood flow measurement.
In short, FMCW laser measurement technology has high precision and high measurement speed and adaptability, widely used in industrial automation, remote sensing measurement, automotive industry, energy and environment and medical field and other fields.
