Refractometer

A refractometer comprising:

• an optical module arranged floatingly inside a housing structure, the optical module comprising
• an optical window to be positioned in a process fluid,
• beam forming and directing means for forming an illuminating beam and for directing the illuminating beam into the process fluid through the optical window and for directing a reflected part of the illuminating beam reflected from the process fluid away from the process fluid, and
• detecting means for detecting an image generated by said beam forming and directing means:
• and
• a housing structure part arranged to support the optical module inside the housing structure via sealing means for sealing the optical module against the housing structure part, the sealing means being arranged between the optical window and the housing structure part,
• wherein the housing structure part is configured to contact the process fluid and is configured to support the optical window via the sealing means, the housing structure part being formed of sapphire.

A refractometer comprising:

• an optical module arranged inside a housing structure, the optical module comprising
• an optical window to be positioned in a process fluid,
• beam forming and directing means for forming an illuminating beam and for directing the illuminating beam into the process fluid through the optical window and for directing a reflected part of the illuminating beam reflected from the process fluid away from the process fluid, and
• detecting means for detecting an image generated by said beam forming and directing means;
• a housing structure part arranged to support the optical module inside the housing structure;
• and
• sealing means for sealing the optical module against the housing structure part, the sealing means being arranged between the optical window and the housing structure part,
• wherein the optical module is compressively supported against the housing structure part in a floating manner at an interface between the optical window and the housing structure part, and
• wherein the housing structure part is configured to contact the process fluid, the housing structure part being formed of a ceramic material.

A refractometer comprising:

• an optical module arranged adjacent to a housing structure, the optical module comprising
• an optical window configured to be positioned in a process fluid,
• a light source configured to emit an illuminating beam, the illuminating beam being directed through the optical window toward an interface between the optical window and the process fluid, a reflected part of the illuminating beam being reflected from said interface and being directed through the optical window away from said interface, and
• a light detector configured to detect an image comprising light from the reflected part of the illuminating beam;
• a housing structure part arranged to support the optical module adjacent to the housing structure;
• and
• a seal disposed between the optical window and the housing structure part, wherein the optical module is compressively supported against the housing structure part in a floating manner at an interface between the optical window and the housing structure part, and
• wherein the housing structure part is configured to contact the process fluid, the housing structure part being formed of sapphire.