| 摘要 |
<p>1,266,754. Refrigerating. ROUSSEL UCLAF. 20 Nov., 1969 [2 Dec., 1968], No. 56932/69. Heading F4H. A sample-holding apparatus for carrying out low temperature optical measurements comprises an insulated enclosure formed by a box 1 carried within the measurement compartment C of a dichograph by a support 2 having a central aperture 9 closable by a plug 45 through which a sample in a container 37 of tapering cross-section is introduced. The container sits in heat transfer relationship within a cavity 14 of a metal block 12 of similar cross-section and which is heated and cooled by means controlled by a device to maintain the block at a predetermined temperature. A cooling fluid, e.g. liquid nitrogen, is passed through a space 19 formed between the walls 15, 18 of the block via pipes 10, 11 and the wall 15 has heating resistors 16 embedded therein, the action of which is limited to the central portion of the block by heat insulating material. Embedded in the walls of the box 1 are sealed portholes 5 registering both with holes 21 in plates 20 screwed to each side of the block and also with holes 41 formed in quartz discs 42 in the walls of the container 37. As a result the sample may be centred with respect to a light beam axis passing through the registering apertures from the measuring apparatus. The temperature control device comprises a probe mounted on the block and arranged to produce an output signal which is proportional to the block temperature and which is compared with a reference signal from a generator to actuate the power supply circuit to the resistors 16 or a valve 31, 33, 34 controlling flow of liquid nitrogen from a tank 26 to the space 19. An expansion chamber formed by a funnel 39 closed by a plug 40 is provided for the sample in the container 37.</p> |
| 申请人 |
ROUSSEL-UCLAF S.A., PARIS |
发明人 |
MENDEZ, MICHEL OSSONA DE, PARIS;FOUCARD, ALBERT, GAGNY;VERIN, JACQUES, MONTMORENCY |
