GB/T 43250-2023Automotive active infrared detection system (English PDF)

3.1 Active infrared detection system

A system that senses the infrared light emitted by the active lighting unit and reflected by the object in a low-illumination environment, and converts it into a distinguishable image signal.

3.2 Active lighting units

A device for emitting infrared light.

3.3 Frame rate

The number of frames that produce a complete image per unit time. That is, the total number of scans of the video signal space lines per unit time. [Source: QC/T 1128-2019, 3.3, modified]

3.4 Pixel

A physical unit in an electronic image sensor that can independently sense light. [Source: QC/T 1128-2019, 3.4]

3.5 Effective pixel

Pixels in an electronic image sensor that can perform effective photoelectric conversion and output image signals. [Source: QC/T 1128-2019, 3.5]

5.1 System classification

Active infrared detection systems can be divided into Type I, Type II and Type III according to functional applications, which meet the following requirements. […]

5.2 Appearance and structural requirements

5.2.1 Appearance

The appearance of the system shall meet the following requirements. […]

5.2.2 Structure

The components of the system shall be firmly assembled. There is no looseness in the fastening parts. The connection is reliable. The structural dimensions shall comply with the specifications in the system manual.

5.3 Image performance

5.3.4 SNR

The SNR of the system shall not be less than 34.7 dB.

5.3.5 Optical axis center precision

The optical axis center precision of the system shall meet (0±2)°.

5.3.6 Exposure adjustment time

The exposure adjustment time of the system shall not be greater than 1 s.

5.3.7 Startup time

The system startup time shall not be greater than 1 s.

5.4 Performance requirements for active lighting units

5.4.1 Wavelength

The wavelength of the system's active lighting units shall be within the range of 780nm~1100nm.

5.5.2.2 Overvoltage

5.5.2.2.1 At (Tmax -20°C)

Test according to 6.5.1.2.1. After the test, the system functional condition shall not be lower than level B.

5.5.2.3 Superimposed AC voltage

Test according to 6.5.1.3. After the test, the system functional condition during and after the test shall reach level A.

5.5.4.7 Ice water shock

Systems installed outside the vehicle shall be tested in accordance with 6.5.3.6. The system functional condition during and after the test shall reach level A.

There are no requirements for systems installed in the passenger compartment.

5.5.4.8 Salt spray corrosion resistance

5.5.4.8.1 Corrosion

Systems installed outside the vehicle shall be tested in accordance with 6.5.3.7.1. Marks and labels shall be clearly visible after testing. The functional condition shall reach level A.

5.5.8 Durability

See Annex B for durability test requirements. The durability test calculation model is shown in Annex C.

6.1 Test conditions

6.1.1 Test environmental conditions

If there are no other provisions, the test environmental conditions shall comply with the provisions of Table 10.

6.1.2 Test voltage

If there are no other provisions, the test voltage shall comply with the requirements of Table 11.

6.1.4 Requirements for test darkrooms

The reflectivity of the walls of the test darkroom shall not be greater than 5%. Turn off all light sources in the test darkroom. The infrared illumination in the darkroom shall not be greater than 2 µW/cm2.

6.1.5 Test operating mode

6.3 Image performance test

6.3.1 Frame rate test

Set the DUT to operating mode B. Test the output video signal with video analysis equipment.

6.3.2 Effective pixel test

Set the DUT to operating mode B. Test the output video signal with video analysis equipment.

6.3.3 MTF value test

6.3.3.2 Type II and Type III systems

In the test darkroom, the DUT's own active lighting unit is used for testing. Select the hypotenuse test chart in accordance with Annex C in ISO 12233:2017.Refer to Figure 2 to lay out the test equipment. The DUT is tested in operating mode B. The test procedure is as follows. […]

6.3.4 SNR test

6.3.4.1 Type I system

In the test darkroom, select the bevel test chart in accordance with Annex C in ISO 12233:2017.Refer to Figure 3 to lay out the test equipment. The emitting wavelength of the external fill light shall be consistent with the DUT sensitive wavelength. The DUT is tested in operating mode B.

6.3.6 Exposure adjustment time test

6.3.6.1 Type I system

In the test darkroom, arrange the test equipment as shown in Figure 3. The DUT is tested in operating mode B.

6.3.9 Brightness uniformity test

6.3.9.1 Test methods for Type I system

In the test darkroom, a parallel light tube solution is used for testing. The wavelength of the built-in fill light of the collimator shall be consistent with the DUT sensitive wavelength. And the uniformity of the luminous surface at the objective lens shall not be less than 90%. Refer to Figure 8 to lay out the test equipment. The DUT is tested in operating mode B.

6.5.1.6 Transient change test of supply voltage

6.5.1.6.1 Instantaneous drop in supply voltage

Set the DUT to operating mode B. Conduct the test according to the method of 4.6.1.2 in GB/T 28046.2-2019. Functional status checks are performed during and after the test.

6.5.1.6.2 Reset characteristics

Set the DUT to operating mode B. Conduct the test according to the method of 4.6.2.2 in GB/T 28046.2-2019. Functional status checks are performed during and after the test.

6.5.1.9 Open circuit test

6.5.1.9.1 Single line open circuit

Set the DUT to operating mode B. Conduct the test according to the method of 4.9.1.2 in GB/T 28046.2-2019. After the test, perform a functional status check.

7.1 Exit-factory inspection

The exit-factory inspection items of the system shall at least include appearance, structural inspection and MTF testing.

7.2 Type inspection

7.2.1 Sampling and grouping for type inspection

Type inspection shall be carried out from systems that have passed the exit-factory inspection according to the one-time sampling plan specified in GB/T 2828.1.

7.2.2 Qualification judgment

All system type inspection items shall meet the specified requirements. If one item is unqualified, double the number of samples can be taken again for re-inspection of the unqualified item. […]