Modern detection device for vehicle lamps

The measurement deviation by the distribution photometer can be caused by the angle and the actual deviation of the angular deviation measurement for the following reasons. The determination of the distance error measurement distance is not accurate, or the change of the distance during the measurement process is not paid enough attention. The illuminance measured by the photometric measurement error does not match the actual. Deviation from the change in the ignition position caused by the operating conditions, changes in ambient temperature and electrical parameters. Errors caused by measurement conditions, shading, scattered light, stray light. From the measured light intensity distribution, the luminous flux, the total luminous flux, and the operational utilization coefficient can be calculated mathematically. The accuracy of the measurement of the light flux is additionally related to the choice of the light intensity as a basis. Measurements that deviate from incompleteness due to the following reasons do not measure light intensity over an angular range that includes effective light flux.

The selection of the emission angle is not sufficient. The selected angle of the light intensity measurement does not reflect the actual light distribution. Numerous possibilities for generating the above-mentioned errors make it impossible to accurately determine the measurement error in one measurement, but only to analyze the magnitude of each error and to limit the reasons for their generation so that this measurement method can still be implemented and applied. Distance measurements should be within the photometric distance. Photometric measurements of light intensity, illuminance or brightness should be within the limits given in the table. A distributed photometer with a light source turning device additionally requires an auxiliary receiver or other auxiliary means to compensate for the effects of lamp position changes. For luminaire measurements, the above requirements are generally sufficient, and the accuracy is no longer sufficient for a floodlight with a large variation in light intensity over a very small angle range.

Such a standard can conveniently dictate the minimum characteristics of a photometer in automotive luminaire measurements in the future. Multiple photometer devices For shaft samples and other measurements, such as production monitoring, the measurement system can be equipped with multiple photometric heads. These photometers can be installed on the test screen in the laboratory and at the corresponding test corners according to the test procedure. An electronic point selector acquires measurements of multiple photometric heads in a short period of time without having to move the measuring object of the distribution photometer. Because each optical head is equipped with its own measuring amplifier and converter, the period of a complete measurement is shorter than that. It is therefore very easy to determine at what position the nominal value of the test procedure can be best maintained when manually changing the position of the spotlight adjustment.

The measurement accuracy at each location here is not reduced because each photometric head displays the same accuracy as the central photometric head of the distribution photometer. Both instruments are equipped with projectors that adjust the light flux and allow the sample to illuminate stably at location and time. The control instrument moves the adjustment motor of the floodlight motor or the Stepper Motor at some reference position. Pressure control or other adjustment devices can be operated manually. The change in position of the light and dark limits occurring here can be ascertained by subsequent measurements with a distribution photometer. The measurement and measurement of the current and voltage of the electrical measuring lamp uses a DC voltage network instrument. The control program in the program allows the circuit to be reliably and balancedly turned on at any given magnitude.

The test program then corrects all light intensity or illuminance values ​​using a correction factor determined by the nominal luminous flux versus test light ratio. Here, the advantage is that the accuracy of the measurement is indeed improved because the lamp with a lower load is significantly more stable at the time of ignition, and its optical properties can be stabilized for a longer period of time. A program automatically applies this correction when measuring. At the same time, the voltage should not be switched on in an impact manner, causing the filament to mechanically deform due to sudden temperature rise. The program slowly and continuously adjusts the voltage or current from the nominal value to the nominal value by means of a regulated power supply.

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