Frequently Asked Questions about Speedometers

The spatial filter detector captures the "surface pattern" optically to perform speed measurements; therefore, it becomes unusable if there are puddles on the road or if the optical system is covered in muddy water. For this reason, it is generally deemed unfeasible to use it on rainy days or when there is standing water on the surface. Although basic "drip-proof measures" have been implemented, no special waterproofing measures have been taken.

In cases where it is expected that water may enter the detector through gaps, such as when water splashes onto the space filter detector or when rain flows onto the vehicle and the detector is placed in its path, please cover the detector with a waterproof sheet such as vinyl at all times during use. In this case, the cover part of the projector will generate considerable heat, so please ensure that the waterproof sheet does not come into direct contact.
Additionally, if the waterproof sheet protrudes into the light path of the receiving part, it will affect the light reception signal, which may cause measurement errors, so please be cautious.

The purpose of the floodlight is solely to illuminate the road surface and make the "surface patterns" more visible, so even if rainwater accumulates in the floodlight, it will have little effect. However, if measurements are conducted over a long period, vaporized water may reduce the light output or adversely affect the halogen lamp. Additionally, if dirty water splashes from the road enter the floodlight, the light output will decrease, which will also degrade the S/N of the detection signal. If water accumulates inside, immediately remove the floodlight hood, dispose of the water inside, and clean the protective glass.

On the other hand, if a similar phenomenon occurs in the optical system of the detection unit (inside the objective lens), it will affect the imaging relationship, significantly reducing detection capability and making measurement impossible. In this case, please dry it in a dry indoor environment over time. If the wetness is severe, it will be necessary to remove the objective lens for cleaning, and in this case, recalibration of the detector is recommended.