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US 2008/0304542 A1Published application
Infrared heated differential scanning calorimeter
AssigneeWaters Investments Limited
InventorROBERT L. DANLEY
Life of this patent
Estimating the term…
Abstract
A heat flux differential scanning calorimeter (DSC) is disclosed. The DSC can be configured with a highly conductive sample assembly enclosure. The enclosure can include a high emissivity coating. In one embodiment, the enclosure extends along a longitudinal direction that is about the same as that of an infrared lamp assembly used to heat the enclosure, thereby increasing the efficiency of heating the sample enclosure. In one embodiment, a gas-filled thermal resistor is used to couple the measurement assembly to a heat sink, such that samples can be rapidly heated and rapidly cooled.
Claims43
A differential scanning calorimeter comprising:
- a measurement assembly for receiving a sample, the measurement assembly comprising an elongated cylinder that includes a sensor assembly;
- an infrared lamp assembly disposed circumferentially around the elongated cylinder and including a cavity having a length approximately the same as that of the circular cylinder;
- a thermal resistor coupled to the measurement assembly, wherein the thermal resistor is disposed substantially outside a region defined by the cavity;
- and
- a heat sink thermally coupled to the thermal resistor and to the infrared reflector.
2 more elements
A differential scanning calorimeter comprising:
- a measurement assembly for receiving a sample, the measurement assembly comprising an elongated cylinder having a high thermal conductivity enclosure having a high emissivity outer surface;
- an infrared lamp assembly disposed circumferentially around the elongated cylinder and including a cavity having a length approximately the same as that of the circular cylinder, the infrared lamp assembly comprising a plurality of tubular lamps arranged with a longitudinal axis parallel to an axis of the elongated cylinder and an infrared reflector comprising a plurality of portions of elliptical cylindrical surfaces that each describe a cylindrical shape having a focus collinear with a position of a tubular lamp;
- and
- a thermal resistor thermally coupled to the measurement assembly.
1 more element
A differential scanning calorimeter, comprising:
- a measurement assembly for receiving a sample, the measurement assembly comprising an elongated cylinder;
- an infrared lamp assembly disposed circumferentially around the elongated cylinder and including a cavity having a length approximately the same as that of the circular cylinder, the infrared lamp assembly comprising a plurality of tubular lamps arranged with a longitudinal axis parallel to an axis of the elongated cylinder and an infrared reflector comprising a plurality of partial cylindrical surfaces that each describe a cylindrical shape having a first focus collinear with a position of a tubular lamp and a second focus collinear with an axis of the elongated cylinder;
- and
- a thermal resistor coupled to the measurement assembly, wherein the measurement assembly includes a sensor assembly having a plurality of cylindrical cavities, each cavity configured to receive and hold sample containers;
- wherein the thermal resistor is operable to vary the thermal resistance between the measurement assembly and the heat sink during sample measurement.
2 more elements
A differential scanning calorimeter for efficient heating during rapid thermal heating, comprising:
- a measurement assembly for receiving a sample, the measurement assembly comprising an elongated cylinder that includes a sensor assembly, wherein the elongated cylinder comprises a high thermal conductivity material having a high emissivity outer coating;
- and
- an infrared lamp assembly disposed circumferentially around the elongated cylinder and including a cavity having a length approximately the same as that of the elongated cylinder, wherein the infrared lamp assembly comprises a plurality of tubular lamps arranged with a longitudinal axis parallel to an axis of the elongated cylinder and wherein, each of the infrared lamps arranged within a cavity is surrounded by an infrared reflector.
A differential scanning calorimeter comprising:
- a measurement assembly for receiving a sample, the measurement assembly comprising an elongated cylinder that includes a sensor assembly;
- an infrared lamp assembly disposed circumferentially around the elongated cylinder and including a cavity having a length substantially similar to that of the circular cylinder;
- a thermal resistor coupled to the measurement assembly, wherein the thermal resistor is disposed substantially outside the cavity, and wherein the thermal resistor comprises a plurality of rods.
A method of performing differential scanning calorimetry, comprising:
- receiving a sample in a measurement assembly comprising an elongated cylinder that includes a sensor assembly;
- heating the sample using an infrared lamp assembly disposed circumferentially around the elongated cylinder and including a cavity having a length approximately the same as that of the circular cylinder;
- providing a thermal resistor coupled to the measurement assembly, wherein the thermal resistor is disposed substantially outside the cavity;
- and
- dissipating heat from the sample using a heat sink thermally coupled to the thermal resistor and to the infrared reflector.
2 more elements
Dependencies are inferred from the claim text.