Reivindicaciones

1. CLAIMS 1. Optical system for analyzing the deterioration of fabric or upholstery (7) by loss of matter comprising a solid light guide (3) to direct and concentrate the radiation (17) from an infrared source (2) towards an array of lenses (11) that quasi-collimates the radiation (17), characterized in that the solid light guide has buttons of a diffusing material (1) on its lower part that break the condition of total internal reflection (TIR) in the focal zone of the lenses (11) to extract the radiation from the guide. 2. Optical system for analyzing the deterioration of fabric or tapestry (7) by loss of matter, according to claim 1, wherein the buttons (1) are located inside the guide by means of perforation or outside, without leaving space between the light guide (3) and the material (1). 3. Optical system for analyzing the deterioration of fabric or tapestry (7) by loss of matter, according to claims 1 and 2, wherein the buttons (1) are located exactly at the focal point of each lens of the array (11) to allow collimation of the light (17) that has not broken the TIR condition 4. Optical system for analyzing the deterioration of fabric or tapestry (7) by loss of matter according to claims 1 to 3, having a retro-reflective material (16) on one side of the guide to improve efficiency within the light guide (3). 5. Optical system for analyzing the deterioration of fabric or upholstery (7) by loss of matter according to the preceding claims in which the infrared radiation source (2) is an LED source whose emission peak is from 900 nm to 1100 nm. 6. Optical system for analyzing the deterioration of fabric or tapestry (7) by loss of matter according to the preceding claims, wherein the radiation transmitted through the fabric or tapestry (7) is detected at each point by means of an imaging system. 7. Optical system for analyzing the deterioration of fabric or tapestry (7) by loss of matter according to the preceding claims, wherein the imaging system is composed of a monochrome camera (9)(10) with a matrix detector without an infrared filter. 8. Optical system for analyzing the deterioration of fabric or tapestry (7) by loss of matter according to the preceding claims, comprising an external rigid structure equipped with extendable vertical bars (5) and horizontal bars (13) for holding the monochrome camera (9)(10), the fabric or tapestry (7) and the diffusing sheet (4). 9. Optical system for analyzing the deterioration of fabric or upholstery (7) due to material loss according to the preceding claims, wherein extension points (6) are provided to regulate the height of the system. The number of points (6) is variable and depends on the requirements. 10. Optical system for analyzing the deterioration of fabric or tapestry due to loss of matter according to the preceding claims, in which a diffusing sheet (4) is incorporated to uniformize the radiation that reaches the fabric or tapestry (7).