Device for detecting flaws on a piece

In a device for detecting flaws on a piece by the automatic reading of indications representative of the flaws to be detected which indications are given by a liquid which, under the action of a light of a first wavelength, emits a radiation of light of a second wavelength, said device being of the type having a source which emits a beam of light of the first wavelength which illuminates the piece to be studied, after said first wavelength beam is reflected by a separating mirror which separating mirror reflects said light of the first wavelength and passes said light of the second wavelength, and with a portion of the light of said second wavelength emitted by said liquid forming a beam which is parallel to and in the opposite direction from said beam of light of the first wavelength reflected by said separating mirror and with said second wavelength beam being detected by a detector, the improvement comprising:

• said source emitting a focused beam;
• and
• first and second oscillating mirrors placed between said separating mirror and said piece to simultaneously assure on the one hand the sweeping of the piece along two coordinate axes by the first wavelength beam and on the other hand the directing onto the detector of said second wavelength beam emitted by said liquid parallel to and in the opposite direction from said first wavelength beam.