Pressure-proof probe

1. A probe for monitoring a pressurised process space in which one or more hazardous substances occur, the probe comprising:

a casing enclosing a first cavity and having a first window, configured to be brought into contact with the pressurised process space, the first window having a first pressure-tight seal formed between the first cavity and the pressurised process space, and a second window having a second pressure-tight seal formed between the first cavity and a second cavity which is sealed off from the pressurized process space, preventing passage of the one or more hazardous substances to the second cavity, wherein the first pressure-tight seal and the second pressure-tight seal are positioned in the casing to form the cavity;

a first coupling line disposed within the cavity between the first and second windows and configured to guide electromagnetic radiation entering through one of the two windows to the other of the two windows;

a first lens disposed between the first coupling line and the first window;

a second lens disposed between the first coupling line and the second window;

a second coupling line positioned in the secondary cavity and disposed on an opposite side of the second window from the first coupling line, the second coupling line configured to guide electromagnetic radiation to or from the first coupling line; and

a third lens positioned in the secondary cavity and disposed between the second coupling line and the second window, wherein the second and third lenses optically couple electromagnetic radiation between the first and second coupling lines through the second window.

2. The probe according to claim 1 , wherein the first window is replaceable.

3. The probe according to claim 1 , wherein the second window is fixed and integrated pressure-tightly in the casing.

4. The probe according to claim 1 , wherein the casing includes connections for flushing the cavity.

5. The probe according to claim 1 , further comprising one of a pressure sensor for monitoring the pressure in the cavity and a flushing gas supply and a sensor for recording a substance entering the cavity.

6. The probe according to claim 1 , wherein the coupling line is configured as a waveguide.

7. The probe according to claim 1 , wherein the coupling line is configured as a light guide.

8. The probe according to claim 7 , wherein the probe is configured as a process window.

9. The probe according to claim 7 , wherein the probe is configured as an immersible probe.

10. A method for monitoring a process space in which one or more hazardous substances occur, the method comprising:

inputting electromagnetic radiation into a first cavity within a casing, the electromagnetic radiation emerging from a first coupling line outside the first cavity, the first cavity being pressure-tightly sealed-off from the process space, preventing passage of the one or more hazardous substances into the first cavity from the process space with a pressure-tight seal formed between the first cavity and the process space, passing through a first lens outside the first cavity, through a first pressure-tight window, through a second lens disposed within the first cavity, and into a second coupling line disposed within the first cavity; and

transmitting, using the second coupling line, the electromagnetic radiation through a third lens disposed within the first cavity, out of the first cavity and into the process space through a second pressure-tight window.

11. The method according to claim 10 , further comprising:

receiving the electromagnetic radiation into the first cavity from the process space through a third pressure-tight window lying opposite the second pressure-tight window, through a fourth lens, and into a third coupling line disposed within the first cavity; and

transmitting, using the third coupling line, the received electromagnetic radiation through a fifth lens and then through the first pressure-tight window and to a spectrometer.

12. The method according to claim 11 , further comprising monitoring the first cavity for indications of substances passing from the process space into the first cavity.

13. The method according to claim 10 , further comprising:

receiving the electromagnetic radiation into a second cavity from the process space through a third pressure-tight window lying opposite the second pressure-tight window, through a fourth lens, and into a third coupling line disposed within the second cavity; and

transmitting, using the second coupling line, the received electromagnetic radiation through a fifth lens and then through a third pressure-tight window and to a spectrometer.

14. The method according to claim 13 , further comprising monitoring at least one of the first cavity and the second cavity for indications of substances passing from the process space into the first cavity or the second cavity, respectively.

15. The method according to claim 10 , wherein phosgene occurs as a hazardous substance within the process space.

16. A probe for monitoring a process within a pressurised process space, the probe comprising:

a casing enclosing a cavity and having a first window that is replaceable, configured to be brought into contact with the process space, and a second window is fixed and integrated pressure-tightly in the casing, both windows having a pressure tight seal with the casing to form the cavity;

a first coupling line disposed within the cavity between the first and second windows and configured to guide electromagnetic radiation entering through one of the two windows to the other of the two windows;

a first lens disposed between the first coupling line and the first window;

a second lens disposed between the first coupling line and the second window;

a second coupling line disposed on an opposite side of the second window from the first coupling line, the second coupling line configured to guide electromagnetic radiation to or from the first coupling line; and

a third lens disposed between the second coupling line and the second window, wherein the second and third lenses optically couple electromagnetic radiation between the first and second coupling lines through the second window.