Test device for rain sensor and method

Abstract

The invention relates to a detection device for detecting a photoelectric sensor (5), comprising a detection disk (2) having the phototropism property, wherein, a rain sensor (5) to be detected can be arranged on the detection disk for detection; and a detection light source (3) which is used for aligning the detection light beam (P) with at least one region which is defined by the rain sensor (5) inside the sensitive surface (8) arranged on the detection disk (2), thereby changing the transmission property of the detection disk (2) in the region.

Description

technical field [0001] The invention relates to a testing device with which the function of an optoelectronic rain sensor can be checked. Furthermore, the invention relates to a method for checking the function of an optoelectronic rain sensor. Background technique [0002] The rain sensors used in automobiles today are based on the principle of optoelectronic function. Such rain sensors have light sources, such as laser diodes or infrared light-emitting diodes. It emits a light beam which, for example, strikes the windshield of a motor vehicle. There, the light beam strikes the boundary surface to the outside environment within the sensitive surface at an angle of total reflection, so that the light beam is reflected by the glass surface onto the receiver of the rain sensor. When it rains, on the sensitive surface determined by the rain sensor on the windshield, the raindrops change the total reflection angle and thus form areas on which the light beam generated by the r...

AI Technical Summary

Problems solved by technology

Such systems are implemented mechanically and are prone to failure due to this

In addition, the silicon punches that move over the sensitive surface of the test disc are prone to soiling or rest on different planes on the test disc due to fluctuations in the contact force, so that in this type of functional test, it is not possible to select from multiple Reproducible results in rain sensors

[0004] However, this mechanical method of simulating the light emission on the rain sensor has the disadvantage that the light emission parameters cannot be kept constant in a simple manner because, for example, when using silicon punches, these parameters are not related to the parameters or the compaction of the silicon punch. force, the cleanliness of the disk surface, and other mechanical influences of the device

Therefore, the repeatability of this type of mechanical method is poor, which makes it difficult to determine the degree of sensitivity of the rain sensor and the functional increase of the sensitive area with sufficient accuracy.

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