DE102019118039A1 - LIDAR testing device and method - Google Patents

Abstract

Test device (10) for testing an optical measuring device (12) which has a field of view (14) and is designed to emit optical signals (70) and to receive response signals (76), in particular a LIDAR measuring device (12) for vehicle applications, with a screen (30) which is arranged in the field of view (14) of a measuring device (12) to be tested, a matrix (40) of transceiver pairs (46) being arranged in a surface (31) of the screen (30) each having an optical receiving element (42) and an optical transmitting element (44), wherein the optical receiving elements (42) are each designed to receive an optical signal (70) at their respective matrix position, and wherein the optical transmitting elements (44 ) are each designed to emit an optical response signal from their respective matrix position, and a control device (50) that ver with the optical receiving elements (42) and the optical transmitting elements (44) is connected, the control device (50) being designed to control the associated optical transmitting element (44) when an optical signal (70) is received at at least one optical receiving element (42) in order to emit an optical response signal (76).

Description

The present invention relates to a test device for testing an optical measuring device, which has a field of view and is designed to emit optical signals and receive response signals, in particular a LIDAR measuring device for vehicle applications.

The present invention further relates to a method for testing an optical measuring device which has a field of view and is designed to emit optical signals and to receive response signals.

LIDAR measuring devices are generally known. LIDAR ("light detection and ranging") is a method for optical distance and speed measurement. Instead of radio waves as in radar, light beams, in particular laser beams, are used. While LIDAR has been used for some time to measure a variety of atmospheric parameters, such as pressure, temperature, chemical composition, etc., there has been increased interest in vehicle-related LIDAR systems for several years.

LIDAR systems are used in vehicles for adaptive cruise control and for automatic emergency braking functions (Kraftfahrtechnisches Taschenbuch, 28th edition, pages 1356-1358). Furthermore, a rapidly increasing number of LIDAR systems are used for highly automated driving functions, as they are necessary in autonomous driving.

LIDAR systems can be designed as Flash LIDAR, with a single, very strong pulse being sent on the transmission side. Other LIDAR systems use a multi-beam structure (multibeam LIDAR). Finally, there are also LIDAR systems that are mechanically scanned (scan LIDAR).

Since the LIDAR systems in vehicle applications are often safety-relevant components, it is necessary to check the LIDAR systems for their function, and in particular for their hardware function.

Since LIDAR systems are set up for ranges of frequently more than 100 m, typically 150 to 250 m, testing, especially with regard to the angular resolution, is not easy to implement, since very large test arrangements are necessary. For example, an optical pulse is emitted for this purpose and the light reflected at the corresponding distances by certain objects is received. The distance is calculated using the speed of light from the temporal position of the received pulse in relation to the transmitted pulse.

In other methods for measuring the transit time, instead of a pulse, amplitude-modulated light signals can be transmitted and, for example, correlated with reflected light in the detector (indirect transit time method).

Since LIDAR systems are to be manufactured in large numbers in the future, there is a need for cost-effective test arrangements.

This object is achieved by a test device for testing an optical measuring device which has a field of view and is designed to emit optical signals and receive response signals, in particular a LIDAR measuring device for vehicle applications, with a screen that is in the field of view of a measuring device to be tested is arranged, wherein a matrix of transceiver pairs is arranged in a surface of the screen, each having an optical receiving element and an optical transmitting element, the optical receiving elements each being designed to receive an optical signal at their respective matrix position, and wherein the optical transmission elements are each designed to emit an optical response signal from their respective matrix position, and with a control device which is connected to the optical reception elements and the optical transmission elements, the control device being designed to be i the reception of an optical signal at at least one optical receiving element to control the associated optical transmitting element in order to emit an optical response signal.

The test apparatus thus includes a screen having an array of pairs of transceivers. Consequently, optical signals emitted by the measuring device, for example a LIDAR measuring device, can be received and optical response signals dependent thereon can be emitted, which in turn are received by the optical measuring device.

So there is a closed loop. The response signals can be signals which vary in amplitude. Furthermore, an angular resolution of the measuring device can be checked via the matrix of transceiver pairs. The arrangement of transceiver pairs and their resolution on the screen (number of transceiver pairs per unit area) are usually implemented depending on the specification of the measuring device to be tested.

The matrix can be a complete matrix, but it can also be an incomplete matrix. In the latter case, for example, more transceiver pairs can be arranged in a central area and in corner areas than in areas in between. If necessary, no transceiver pairs at all can be arranged in the areas in between.

The test device is able to simulate different types of objects, for example as a function of the signal strengths. Furthermore, as mentioned, the angular resolution can be checked.

In some cases, at least a certain distance to an object can also be simulated, which depends on how long the time is between receiving the optical signal from the measuring device and sending the optical response signal.

The test device can be made compact and consequently inexpensive and is particularly suitable for use in the production of optical measuring devices, for example in the area of final inspection. The test device can be used for sequential measurements of signals and parameters with subsequent simulation.

The optical signals that are emitted by the measuring device can be of different types. The LIDAR can be a flash LIDAR, a scan LIDAR or a multibeam LIDAR. As a rule, the number and resolution of the transceiver pairs in the matrix must be adapted for this.

The test device is preferably set up as follows: The optical measuring device to be tested is arranged in front of the screen and is contacted with a control computer that is able to carry out previously stored test sequences in which the optical measuring device is controlled accordingly. Furthermore, the control computer is able to evaluate and, if necessary, store response signals as they are recorded by the optical measuring device.

The control computer is preferably connected to the control device of the test device. The control device can preferably convert and process the detected optical signals into electrical signals, specifically for forwarding to the control computer. In the control computer, the test signals that are fed into the optical measuring device can then be stored together with the received signals and, if necessary, correlated in order to check and / or log the functionality of the optical measuring device.

The protocol function, in which the control computer logs and securely stores the tests carried out, is important for safety-relevant devices such as LIDAR measuring devices when used in motor vehicles.

The task is thus completely solved.

According to a preferred embodiment, the control device has at least one adjustable delay element which is assigned to a transceiver pair and which is connected between the optical receiving element and the optical transmitting element of this transceiver pair, so that after receiving an optical signal at the optical receiving element the associated optical transmission element can be controlled with a time delay in order to simulate a distance of the screen from the measuring device which is greater than the actual distance of the measuring device from the screen.

This measure makes it possible to make the test device very compact overall.

While LIDAR systems often have to be tested for greater distances of more than 100 m, the present test device can in many cases be set up with dimensions of less than 1 m both in depth, in height and in width direction. The delay element is able, for example, to set the time delay between the reception of the optical signal and the transmission of the optical response signal in a range from picoseconds to nanoseconds. This enables pulse transit times and thus distances to be simulated in the usual areas.

In this case, it is preferably also possible to simulate a movement by storing patterns which define a time sequence for the transmission of response signals. With special functions and a synchronization in the firmware of the optical measuring device, certain parameters, such as radiated power and the emitted solid angle, can be determined more precisely as the "illumination area".

According to a further preferred embodiment, the control device is designed to detect a received signal strength of a received signal of the optical receiving element and to control the associated optical transmitting element so that it emits an optical response signal with a transmitted signal strength that is a function of the received signal strength .

In general, it is preferred to detect the received signal strength of a received signal in order to determine whether a transmission power of the optical measuring device (for example an amplitude of a LIDAR pulse) is correct. For example, different amplitudes of the optical signal of the measuring device can also be set in order to be able to check the functional spectrum with regard to the transmitted and received power.

By controlling the optical transmission element of a transceiver pair in such a way that an optical response signal has a transmission signal strength that is a function of the reception signal strength, feedback can take place in a comparatively simple manner. This is because a receiving array of the optical measuring device can then record this response signal.

According to a further preferred embodiment, the control device has a micro-controller which is designed to detect and store the received signal strength of a received signal of the optical receiving element.

The storage can also include the forwarding of the received signal to a control computer that is connected to the control device.

The control device is preferably formed on a printed circuit board which is arranged parallel to the screen.

The circuit board is preferably arranged on a side of the screen facing away from the optical measuring device to be tested. Due to the parallel alignment, delay elements, for example, which can be implemented using programmable logic (PLL), can be arranged spatially close to the respectively assigned transceiver pairs. This way, uniform transit times can be guaranteed.

In general, it is conceivable that the screen is designed as a large screen, for example the size of a cinema screen, so that a vehicle with a LIDAR measurement system already installed on it is driven in front of the screen (for example as part of a vehicle final inspection).

While the screen of the test device according to the invention can consequently be arranged outdoors, it is preferred if the screen with the matrix of transceiver pairs is fixed in an interior of a housing, with a measuring device receptacle also being formed in the interior to accommodate a to accommodate the testing measuring device in the housing and to position it in relation to the screen.

The housing can be a large space in which the screen is arranged and into which, for example, a vehicle with an already installed LIDAR system can be driven.

However, it is particularly preferred if the housing is a compact housing with dimensions of less than 1 m in all directions. In this case, the testing device is preferably designed exclusively for testing the optical measuring device after its production, that is to say before the testing device is installed in a vehicle or another application.

The housing is preferably designed so that it can be closed for testing a measuring device.

In other words, the housing is designed so that it can be opened to accommodate a measuring device and then closed again, so that the measuring device is preferably surrounded on all sides by the housing. In other words, in particular the space between the optical measuring device and the screen is sealed against the surroundings in a light-tight manner (in the infrared wavelength range of the LIDAR system).

This can prevent the test using the test device from being disturbed by ambient light.

It is also particularly preferred if an inside of the housing has a coating with a low reflection coefficient to suppress scattered radiation, at least in an area adjacent to the screen.

In this way, errors during the test due to reflected and scattered signals can be largely avoided.

Overall, it is advantageous if the surface of the screen has a coating with a low reflection coefficient.

In the present case, a low reflection coefficient is preferably understood to mean that more than 50% of the light in the wavelength range of the optical signals (e.g. infrared) is absorbed by the coating, i.e. less than 50% of the optical signals incident thereon are reflected. This factor is preferably less than 25%, in particular less than 10%.

The coating can also have a certain roughness in order to reflect diffusely.

The present invention further relates to a method for testing an optical measuring device that has a field of view and is designed to emit optical signals and receive response signals, in particular a LIDAR measuring device for vehicle applications, with the steps of arranging a measuring device to be tested in front of a screen, so that the screen is arranged in the field of view of the measuring device to be tested, a matrix of transceiver pairs being arranged in one surface of the screen, each having an optical receiving element and an optical transmitting element, the optical receiving elements each being designed to have a receiving an optical signal at their respective matrix position, and wherein the optical transmission elements are each designed to emit an optical response signal from their respective matrix position; Controlling the measuring device so that it emits an optical signal in the direction of the screen; and receiving the optical signal at at least one optical receiving element and detecting the signal strength of the optical signal.

In the event that the method according to the invention is carried out, an associated test device can be designed in such a way that it has a matrix with only optical receiving elements. However, the test device is preferably designed as a test device according to the invention with a matrix of transceiver pairs.

In the method according to the invention, it is preferred if, in response to the reception of an optical signal at the at least one optical receiving element, the associated optical transmission element is activated to emit an optical response signal, and the optical response signal emitted by the optical transmission element is received by the measuring device and is processed.

It is also preferred if the optical response signal is delayed in time with respect to the reception of the optical signal in order to simulate a distance between the screen and the measuring device which is greater than the actual distance between the measuring device and the screen.

It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the respectively specified combination, but also in other combinations or alone, without departing from the scope of the present invention.

• 1 eine schematische Darstellung einer erfindungsgemäßen Prüfvorrichtung;
• 2 eine Draufsicht auf einen Schirm der Prüfvorrichtung der 1 gemäß der Ansicht II-II von 1;
• 3 ein schematisches Blockdiagramm einer Steuereinrichtung der Prüfvorrichtung der 1; und
• 4 Zeitablaufdiagramme von optischen und elektrischen Signalen in der Steuereinrichtung der 3.

Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description. Show it:

• 1 a schematic representation of a test device according to the invention;
• 2 a plan view of a screen of the test device of 1 according to view II-II of 1 ;
• 3 a schematic block diagram of a control device of the test apparatus of FIG 1 ; and
• 4th Timing diagrams of optical and electrical signals in the control device of FIG 3 .

In 1 a test device is shown in schematic form and is generally designated by 10.

The testing device 10 is used to test an optical measuring device 12, which can be, for example, a LIDAR measuring device that has a field of view 14th and is designed to emit optical signals and to receive optical response signals.

In 1 is such an optical measuring device 12th with a vertical field of view angle 15th shown.

The optical measuring device 12th has a front on which the optical signals are emitted and received. The optical measuring device has on a rear side 12th a contact arrangement 16 on which the optical measuring device 12th can be controlled.

The testing device 10 serves to test an optical measuring device for functionality after it has been manufactured (hardware tests). The test device can carry out a function test of such optical measuring devices or optical sensors in production. The test device is used in particular 10 in addition, from the optical measuring device 12th to absorb or to receive and measure transmitted optical signals and to delay them in a targeted manner in time, with optical response signals being sent back with a time delay and possibly with varying amplitude. The test depth can be increased through special functions and synchronization in the sensor firmware.

More precisely, the test device 10 a housing 20th with a base plate 22nd on, for example, on a base 24 mounted or arranged. On the base plate 22nd is a measuring device recording 26th formed on which an optical measuring device 12th can be arranged to be examined.

The case 20th has a hood 28 on that from the base plate 22nd can be removed, a measuring device 12th in the housing 20th and which can then be closed again to create an interior 29 to close light-tight against the environment.

The testing device 10 has an umbrella 30th on that in the interior 29 is arranged. The screen 30th is on the baseplate 22nd fixedly mounted, preferably aligned vertically, such that a surface 31 the screen to the optical measuring device 12th shows. The optical measuring device 12th is in the measuring device recording 26th recorded so that between the measuring device 12th and the surface 31 of the screen 30th a distance 32 is set up. The distance 32 can for example be in a range from 5 cm to 200 cm, but is preferably in a range from 10 cm to 80 cm.

In an area between the measuring device 12th and the screen 30th is an inner wall of the housing (the hood 28 ) with a low reflection coating 34 educated. The surface too 31 of the screen 30th is preferably provided with a low-reflection coating.

Like it in 2 is shown, the screen points 30th a height 36 and a width 38 on. The height 36 of the screen is preferably smaller than 100 cm, in particular smaller than 50 cm. The width 38 is preferably smaller than 120 cm, preferably smaller than 60 cm.

In the surface 31 of the screen 30th is a matrix 40 of transceiver pairs 46 formed, each having an optical receiving element 42 and an optical transmitter element 44 include.

The matrix 40 in the present case has n rows and m columns. In the representation of the 2 where n = 11 and M = 12. However, these values are to be understood purely as examples. The number of transceiver pairs per unit area (the resolution) is variable and is usually used for a certain type of optical measuring device 12th elected. In other words, everyone is an umbrella 30th preferably to a certain type of optical measuring device 12th Voted.

The optical receiving elements 42 and optical transmission elements 44 of each transceiver pair 46 are preferably arranged in close proximity to one another, as is also the case in 2 is shown.

The matrix 40 can be a complete matrix. In many cases, however, it is sufficient to carry out a function test if the matrix is designed as an incomplete matrix, for example the transceiver pairs in corner areas 46 has, and also in edge areas and in a central area. The matrix can be in areas in between 40 even without transceiver pairs 46 be trained. This is in 2 This can be seen from the fact that the actually existing transceiver pairs are shown in bold lines, whereas the non-existent transceiver pairs 46 of the matrix are shown in thin lines.

Although the matrix has 11 x 12 = 132 matrix positions in the resolution shown, the actual number of transceiver pairs in this case is only 22, four transceiver pairs each in the areas of the corners, four transceiver pairs in the area of the middle and two transceiver pairs. Pairs in the area of vertical edges of the screen 30th . The ratio of the number of transceiver pairs to the number of matrix positions is preferably in a range from 1/20 to 1/4.

Like it in 1 is shown, the test device 10 a control device 50 on that with the transceiver pairs 46 connected is. The control device is preferably 50 on a circuit board 51 formed parallel to the screen 30th is arranged. The control device 50 is, as shown at A, with a control computer 52 connected to the outside of the housing 20th is arranged. The tax calculator 52 is with the contact arrangement 16 the optical measuring device 12th connected and can the optical measuring device 12th consequently control to emit optical signals (such as a LIDAR pulse), and to receive and process response signals.

Furthermore, the control computer 52 with the control device 50 communicate. The control device 50 can for example receive electrical signals, which the optical receiving elements generate when an optical signal is received, to the control computer 52 forward, in this way to check whether the optical measuring device 12th actually optical signals within the field of view 14th with a certain amplitude when the optical measuring device 12th this from the control computer 52 has been controlled.

The control device 50 and the tax calculator 52 together form a control arrangement 54 .

Like it in 3 is shown, the control device 50 for each receiving element 42 a signal processing device 60 on. The signal processing device 60 is with a measured value processing device 62 the control device 50 connected. The measured value processing device 62 is with a micro controller 64 the control device 50 connected.

The control device 50 also includes for each optical transmitter element 44 a Control device 68, also with the micro-controller 64 connected is.

While the signal processing device 60 an optical receiving element 42 is used for signal processing and distribution, the control device 68 has an optical transmission element 44 the purpose of controlling their light output and the optical transmission element 44 head for.

The optical receiving element 42 and the optical transmission element 44 are each preferably designed as diodes, at least the optical transmitter element 44 is preferably designed as an optical laser diode.

Between each signal processing device 60 and each control device 68 is a delay element 66 switched, which is set up, after receiving an optical signal at the optical receiving element 42 the associated optical transmission element 44 time-delayed to move to a distance of the screen 30th from the measuring device 12th to simulate that is greater than the actual distance 32 the measuring device 12th from the screen 30th .

Consequently, the delay element 66 Pulse transit times and thus distances can be simulated.

The delay element 66 can be implemented, for example, by programmable logic (PLLP) and can set up delay times in the range from picoseconds to nanoseconds. The delay element 66 is also with the micro controller 64 connected. The micro controller 64 can thereby the delay time .DELTA.T, which by the delay element 66 set up.

In 3 it is also shown that each optical receiving element 42 an optical signal 70 receives that from the optical measuring device 12th has been radiated. Any optical receiving element 42 is designed to the optical signal 70 into an electrical received signal 72 to convert that of the respective signal processing device 60 is fed.

On the other hand, each driver generates 68 an electrical transmission signal 74 , the respective optical transmission element 44 is supplied to an optical response signal 76 to radiate.

4th shows timing diagrams of the signals 70 , 72 , 74 , 76 .

The optical signal 70 from the measuring device 12th is emitted, is transmitted to an optical receiving element 42 received as a pulse with a signal strength (amplitude P ₁ ). The optical receiving element 42 generates an electrical reception signal from this 72 which in terms of shape and amplitude with the optical signal 70 correlated. An amplitude or signal strength of the received signal is an example 72 indicated by P ₂ , where P _{2 is} preferably proportional to P ₁ .

The received signal 42 is in the signal processing device 60 processed and distributed, on the one hand to the measured value processing device 62 and on the other hand to the delay element 66 . This one has one from the micro controller 64 set time delay .DELTA.T, and releases the control device 68 to an electrical transmission signal 74 to generate, which has a signal strength P ₃ , but is preferably designed in terms of shape (pulse) similar to the electrical received signal 72 .

The broadcast signal 74 is by ΔT compared to the received signal 72 delayed. The optical transmission element 44 generated from the transmitted signal 74 an optical response signal 76 pointing towards the optical measuring device 12th is emitted and a delayed response to the optical signal 70 represents a certain distance between the screen 30th and the measuring device 12th to simulate.

The response signal 76 points in 4th a signal strength P ₄ .

It goes without saying that the signal strength P _{4 is} preferably proportional to the signal strength P ₃ . The signal strength P ₃ is preferably a function of the signal strength P ₂ and can be varied to carry out different tests, preferably by means of the micro-controller.

The received signal 72 is via the signal processing device 60 also of the measured value processing device 62 fed, and from there to the micro-controller 64 . The micro controller 64 is with the tax calculator 52 connected. Consequently, via the micro controller 64 a log function of the test of the measuring device 12th will be realized.

The generation of the transmission signal 74 from the received signal 72 with the preset delay in the delay element 66 preferably takes place directly, ie without the interposition of the micro-controller 64 . As a result, very short delay times in the range of picoseconds or nanoseconds can be set.

Overall, the present invention provides a test device or a test method for the functional test of optical sensors, for example LIDAR, in production. The test device picks up the signals sent by the optical measuring device, measures them and sends them back as response signals, delayed in time and varying in amplitude. The test depth can be determined by special functions and synchronization in the firmware of the measuring device 12th increase.

Measuring devices 12th , such as LIDAR sensors, are used for optical distance and speed measurement and often work in a detection range of 100 m to approx. 200 m. With the test device according to the invention, it is possible to carry out test procedures on the measuring devices independently of reality and light signals depending on to generate transmitted pulses.

The present method is very suitable for mass production of optical measuring devices because of the compact dimensions of the test device and the rapid measurement of signals. The present method represents an inexpensive solution for use in the production of optical measuring devices, especially LIDAR sensors.

Due to the compact dimensions of the test device, which can simulate objects at a distance of up to several 100 m with a distance of only a few cm between the screen and the measuring device, it is particularly suitable for end-of-line acceptance of manufactured, but not yet in Optical measuring devices built into vehicles. A particular advantage is the simulation using the signals / pulses sent by the measuring device and the simultaneous measurement of these signals.

Through the arrangement of the transceiver pairs 46 the angular resolution of the optical measuring device can be checked. The dimension and the resolution (number of transceiver pairs) depend on the specification of the measuring device to be measured.

In the control device 50 Movement can also be simulated by storing patterns that are used in a chronological sequence. With special functions and synchronization in the firmware of the optical measuring device, certain parameters such as radiated power and emitted solid angle can be determined more precisely as the "illumination area".

List of reference symbols

10

Testing device

12

optical measuring device

14th

Field of view

15th

vertical field of view angle

16

Contact arrangement

20th

casing

22nd

Base plate

24

base

26th

Measuring device recording

28

Hood

29

inner space

30th

umbrella

31

surface

32

distance

34

low reflection coating

36

height 30th

38

width 30th

40

matrix

42

optical receiving element

44

optical transmitter element

46

Transceiver pairs

50

Control device

51

Circuit board

52

Tax calculator

54

Tax arrangement

60

Signal processing device

62

Measured value processing device

64

Micro controller

66

Delay element

70

optical signal ( 12th )

72

electrical transmission signal

76

optical response signal

m

Number of columns from 40

n

Number of lines from 40

Claims (12)

Testing device (10) for testing an optical measuring device (12) which has a field of view (14) and is designed to emit optical signals (70) and to receive response signals (76), in particular a LIDAR measuring device (12) for vehicle applications, with: - a screen (30) which is arranged in the field of view (14) of a measuring device (12) to be tested, wherein a surface (31) of the screen (30) has a Matrix (40) of transceiver pairs (46) is arranged, each having an optical receiving element (42) and an optical transmitting element (44), wherein the optical receiving elements (42) are each designed to transmit an optical signal (70) their respective matrix position, and wherein the optical transmission elements (44) are each designed to emit an optical response signal from their respective matrix position, and - a control device (50) which is connected to the optical reception elements (42) and the optical transmission elements (44 ) is connected, the control device (50) being designed to transmit the associated optical transmitting element when an optical signal (70) is received at at least one optical receiving element (42) ent (44) to emit an optical response signal (76). Test device according to Claim 1 , the control device (50) having at least one adjustable delay element (66) which is assigned to a transceiver pair (46) and which is connected between the optical receiving element (42) and the optical transmitting element (44) of this transceiver pair (46) are, so that after receiving an optical signal (70) the optical receiving element (42) the associated optical transmitting element (44) can be controlled with a time delay in order to simulate a distance of the screen (30) from the measuring device (12) which is greater is than the actual distance (32) of the measuring device (12) from the screen (30). Test device according to Claim 1 or 2 , wherein the control device (50) is designed to detect a received signal strength (P ₂ ) of a received signal (72) of the optical receiving element (42) and to control the associated optical transmitting element (44) in such a way that it emits an optical response signal (76 ) with a transmission signal strength (P ₄ ) that is a function of the reception signal strength (P ₂ ). Test device according to one of the Claims 1 to 3 , wherein the control device (50) has a micro-controller (64) which is designed to detect and store the received signal strength (P ₂ ) of a received signal (72) of the optical receiving element (42). Test device according to one of the Claims 1 to 4th wherein control device (50) is formed on a circuit board (51) which is arranged parallel to the screen (30). Test device according to one of the Claims 1 to 5 , wherein the screen (30) with the matrix of transceiver pairs (46) is fixed in an interior (29) of a housing (20), wherein in the interior (29) a measuring device receptacle (46) is also formed in order to a measuring device (12) to be tested is accommodated (20) in the housing and positioned in relation to the screen (30). Test device according to Claim 6 , wherein the housing (20) is designed so that it can be closed for testing a measuring device (12). Test device according to Claim 6 or 7th wherein an inside of the housing (20) has a coating (34) with a low reflection coefficient at least in an area adjacent to the screen (30). Test device according to one of the Claims 1 to 8th wherein the surface (31) of the screen (30) has a coating with a low reflection coefficient. Method for testing an optical measuring device (12) which has a field of view (14) and is designed to emit optical signals (70) and to receive response signals (76), in particular a LIDAR measuring device for vehicle applications, with the following steps: Arranging a measuring device (12) to be tested in front of a screen (30), so that the screen (30) is arranged in the field of view (14) of the measuring device (12) to be tested, a surface (31) of the screen (30) having a Matrix of transceiver pairs (46) is arranged, each having an optical receiving element (42) and an optical transmitting element (44), the optical receiving elements (42) each being designed to transmit an optical signal (70) at their respective matrix position to receive, and wherein the optical transmission elements (44) are each designed to emit an optical response signal (76) from their respective matrix position; - controlling the measuring device (12) so that it emits an optical signal 70) in the direction of the screen (30); and - receiving the optical signal (70) at at least one optical receiving element (42) and detecting the signal strength (P ₁ ) of the optical signal (70). Procedure according to Claim 10 , wherein in response to the receipt of an optical signal (70) at the at least one optical receiving element (42), the associated optical transmitting element (44) is activated in order to emit an optical response signal (76) received by the measuring device (12) and can be analyzed. Procedure according to Claim 11 , the emission of the optical response signal (76) being delayed compared to the time of receipt of the optical signal (70) in order to simulate a distance of the screen (30) from the measuring device (12) which is greater than the actual distance (32 ) the measuring device (12) from the screen (30).

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