Application example in control characteristic evaluation

The Galvanoscanner is equipped with a motor to adjust the scanning angle of the mirror that reflects the laser beam and a high-precision position sensor. It is used in a wide range of applications in combination with laser beam, such as laser markers, microscopes, and LiDAR, and is required to scan mirrors over a wide range at high speed and with high precision. When developing products, it is necessary to perform highly accurate simulations to achieve high speeds and optimize models and control parameters. In addition, in order for customers to use products with peace of mind, it is required to confirm that the product's performance is guaranteed before shipping. Therefore, it was a challenge to easily measure and understand the control characteristics of the Galvanoscanner and the mirror's resonant frequency with high precision.

By using the DS-5000 100 kHz 4ch (FFT analyzer) and the dedicated application, OS-4100 (Frequency response measurement software) to measure frequency characteristics, we were able to conduct three types of tests with one device.

1. Reducing measurement man-hours by increasing the number of channels
So far, the measurement was performed by 2ch analyzer, 4ch one has been introduced this time. When evaluating control characteristics, two types of signals (position sensor signals and motor current signals) which respond to the command signals can be measured at the same time. By understanding these characteristics, it is useful to improve simulation accuracy and optimize control.

2. Automating settings with Auto resolution control function
When determining the mirror's resonant frequency, it is necessary to increase the frequency resolution only near the resonance. By using the Auto resolution function, the frequency resolution near resonance can be automatically increased without the setting by an operator, thereby preventing human errors.

3. Measuring safely with all channels isolated hardware
It enables to measure safely even in the field or the object where is likely to have ground loop, electrical noise and potential differences and to prevent failures due to wiring errors.