Device for optical transmission measurement of a flat sample

Abstract

Device for optical transmission measurement of a flat sample (1a, 1b), with the following features: a) the device comprises a housing (10) which can be closed in a light-tight manner, with a light intensity sensor (20) in an interior of the housing (10) on a ceiling and a surface light source (30) in the interior of the housing (10) on a floor, b) for the transmission measurement of a flat sample (1a) which projects beyond a base area of ​​the housing (10), the housing (10) is divided into two parts and has a removable head part (11) and a body part (12) in order to clamp the flat sample (1a) between the head part (11) and the base part (12), c) for the alternative transmission measurement of a flat sample (1b) which is clamped in a frame (2), guide rails (15a) and (15b) are arranged on opposite abutting surfaces (11a, 12a) between the head part (11) and the body part (12) on the body part (12) in order to accommodate the frame (2) with the clamped flat sample (1b) in the housing (10) in the manner of a drawer.

Description

[0001] The invention relates to a device for measuring the optical transmission of a flat sample.

[0002] The determination of optical transmission is based on a luminous intensity measurement of the light source with and without the sample. The values ​​obtained are then used to calculate the optical transmission, expressed as a percentage.

[0003] EP 1 139 079 A2 discloses a device for measuring the optical transmission of a sample. The device comprises a housing that can be sealed light-tight, with a light intensity sensor located inside the housing on a ceiling and a surface light source located inside the housing on a floor.

[0004] The invention is based on the object of creating a device for optical transmission measurement of a flat sample that is easy to handle.

[0005] The advantages of the invention lie in the ease of use of the device for optical transmission measurement of a flat sample. The device comprises a housing that can be sealed light-tight. This allows the device to be used even in bright environments. For transmission measurement of a flat sample that extends beyond the base of the housing, the housing is divided into two parts and has a removable head section and a body section for clamping the flat sample between the head section and base section. Large-area samples, such as large-scale camouflage nets, can be tested non-destructively.

[0006] For alternative transmission measurements of a flat sample clamped in a frame, guide rails are arranged on opposite abutting surfaces between the head section and the body section of the body section. They accommodate the frame with the clamped flat sample in the housing like a drawer. The flat sample, clamped in a frame, can be used for further measurements, such as recording radar properties.

[0007] According to an advantageous embodiment of the invention, the light intensity sensor is arranged off-center inside the housing on the ceiling, allowing different measurement areas to be obtained by rotating the frame by 90°. The average value of the measurements obtained is calculated.

[0008] According to a further advantageous embodiment of the invention, the abutting surfaces between the head part and the body part have a shoulder in order to increase light tightness.

[0009] According to a further advantageous embodiment of the invention, the flat sample is a camouflage net or a camouflage tarpaulin or a section thereof.

[0010] Embodiments of the invention are explained in more detail below with reference to the drawings. Fig. 1 a device for measuring the optical transmission of a large-area sample, shown spatially and in section; Fig. 2 a device for optical transmission measurement of a flat sample in a frame, shown spatially and in section.

[0011] The Fig. 1 shows a device for measuring the optical transmission of a flat sample 1a. The device comprises a housing 10 that is sealed light-tight, with a light intensity sensor 20 located inside the housing 10 at a ceiling and a surface light source 30 located inside the housing 10 at a floor.

[0012] The flat sample 1a is a fully configured camouflage net. The camouflage net extends beyond the base of the housing 10. The housing 10 is divided into two parts, comprising a removable head section 11 and a body section 12. During the transmission measurement, the flat sample 1a is clamped between the head section 11 and the base section 12.

[0013] The Fig. Figure 2 illustrates an alternative transmission measurement of a flat sample 1b clamped in a frame 2. Guide rails 15a and 15b are arranged on opposite abutting surfaces 11a, 12a between the head part 11 and the body part 12 on the body part 12 in order to accommodate the frame 2 with the clamped flat sample 1b in the housing 10 in a drawer-like manner.

[0014] The abutting surfaces 11a, 12a between the head part 11 and the body part 12 have a shoulder 13 to increase light tightness.

[0015] The steps of optical transmission measurement of a large-area camouflage net are ( Fig. 1): - Lifting off the cover part 11 and placing the large-area sample 1a on the body part 12. - Measurement of optical transmission. - Lifting the head part 11 and moving the camouflage net to obtain a different measuring surface and measuring the optical transmission. - Further measurements. - Averaging.

[0016] The steps of the optical transmission measurement of a flat sample 1b in frame 2 are ( Fig. 2): - Drawer-like insertion of the frame 2 with the measuring sample 1b into the housing 11 using the guide rails 15a and 15b. - Measurement of optical transmission. - Drawer-shaped frame extension and rotation by 90° - The light intensity sensor 20 is mounted off-center on the ceiling inside the housing 10. Rotating the frame 2 with the clamped flat sample 1b by 90 degrees results in a different measurement surface. - After four measurements, the average is calculated.

[0017] The brightness of the homogeneous area light source is adjustable. The sample frame size is 96 cm x 96 cm. The light source measures 1 m x 1 m. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 1 139 079 A2

[0003]

Claims

[1] Device for measuring the optical transmission of a flat sample (1a, 1b), having the following features: a) the device comprises a housing (10) which can be closed in a light-tight manner, with a light intensity sensor (20) in an interior of the housing (10) on a ceiling and a surface light source (30) in the interior of the housing (10) on a floor, b) for the transmission measurement of a flat sample (1a) which projects beyond a base area of ​​the housing (10), the housing (10) is divided into two parts and has a removable head part (11) and a body part (12) in order to clamp the flat sample (1a) between the head part (11) and the base part (12), c) for the alternative transmission measurement of a flat sample (1b) which is clamped in a frame (2), guide rails (15a) and (15b) are arranged on opposite abutting surfaces (11a, 12a) between the head part (11) and the body part (12) on the body part (12) in order to accommodate the frame (2) with the clamped flat sample (1b) in the housing (10) in the manner of a drawer. [2] Device according to claim 1, wherein the light intensity sensor (20) is arranged off-center inside the housing (10) on the ceiling in order to obtain different measuring surfaces by a 90° rotation of the frame (2). [3] Device according to claim 1 or 2, wherein the abutting surfaces (11ȧ, 12a) between the head part and the body part have a shoulder (13) in order to increase light tightness. [4] Device according to one of claims 1 to 3, wherein the flat sample (1a, 1b) is a camouflage net or a camouflage tarpaulin or a section thereof.

Images