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WO1999031492A1 - Procede et dispositif servant a determiner le point de congelation - Google Patents

Procede et dispositif servant a determiner le point de congelation Download PDF

Info

Publication number
WO1999031492A1
WO1999031492A1 PCT/SE1998/002144 SE9802144W WO9931492A1 WO 1999031492 A1 WO1999031492 A1 WO 1999031492A1 SE 9802144 W SE9802144 W SE 9802144W WO 9931492 A1 WO9931492 A1 WO 9931492A1
Authority
WO
WIPO (PCT)
Prior art keywords
sample
liquid
container
freezing
point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE1998/002144
Other languages
English (en)
Swedish (sv)
Inventor
Billy Backman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Enator AB
Original Assignee
Enator AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Enator AB filed Critical Enator AB
Priority to AU15151/99A priority Critical patent/AU1515199A/en
Publication of WO1999031492A1 publication Critical patent/WO1999031492A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
    • G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point

Definitions

  • the spreading of salt has disadvantages, however.
  • the environment on and around the road can be damaged by salt, at least in larger quantities.
  • Spreading salt also involves a large expense, and vehicles that travel on roads on which salt is spread are affected by rust.
  • the liquid On one side the liquid is in thermal contact with the Peltier element. By conducting current in one direction through the element the liquid is cooled, and when the direction is reversed, the liquid is heated. A number of cycles must be run in order to determine the freezing point.
  • the Peltier element is in itself a device for measurement of the temperature through the use of special characteristics of the Peltier element. The ambient temperature is also measured.
  • FIG 1 is a schematic perspective front view showing a device according to the invention before a process of measurement
  • FIG 2 is a side view partially in section of the device in FIG 1 during a process of measurement
  • FIG 3 is a diagram that schematically shows the temperature in a sample during a process of measurement.
  • Measuring assembly 18 is comprised of a cooling device 10 and a heating device 11.
  • a Peltier element 19 serves both as cooling and heating device.
  • the Peltier element is located centrally in the bottom on a container 13 formed as a recess in the cylindrical body.
  • Control plate 17 functions so that liquid, which splashes up from the road surface, is led to container 13.
  • Control plate 17 includes a membrane of flexible sheet material, for example rubber, that constitutes a barrier 20 during a measurement (see FIG 2).
  • Strut 21 connects bottom plate 16 with control plate 17.
  • the flexible sheet material is firmly braced against control plate 17 with a locking ring 22 (see FIG 2).
  • the container is cleaned between measurements with a cleaning device 15 so that a new measurement will relate to a new liquid, for example from a different part of the road.
  • Cleaning device 15 can contain a nozzle or similar for compressed air directed toward the container. The nozzle is connected with a source of compressed air on the vehicle.
  • FIG 2 shows a design of an apparatus according to the invention during an ongoing process of measurement.
  • Barrier 20 has been set against container 13, so that liquid collected therein cannot disperse. At the same time new liquid is prevented from coming into the container.
  • the barrier in the form of the flexible membrane is extended by filling the space behind the membrane with compressed air.
  • a surface on Peltier element 19 is in thermal connection with container 13, suitably by constituting part of the bottom of the container.
  • a control device 14 connected with the Peltier element is designed to provide electrical current to the Peltier-element in this position, so that its upper side is first warmed up in preparation for a measurement.
  • Control device 14 can be designed as a circuit card separated from the measurement device itself.
  • a heat absorbent body 23, for example of copper, is also in contact with the Peltier element.
  • time t is on the x-axis and temperature T on the y-axis.
  • the surrounding temperature is suitably measured with a measurement sensor separately connected with the control device.
  • the surrounding temperature is marked at T s .
  • the control device is automatically set so that a suitable level of power is supplied to the Peltier element.
  • the measurement is started with a brief heating phase, which is shown in the curve in FIG 3 as a continuously rising temperature value.

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Procédé et dispositif servant à mesurer le point de congélation et consistant en un ensemble de mesure (18) comprenant un système de refroidissement (10) et un système de réchauffement (11) afin de refroidir et de réchauffer de façon répétée un échantillon de liquide prélevé sur une surface de route, de manière à le congeler et à le réchauffer de nouveau à l'état de liquide, des moyens de mesure servant à effectuer la mesure continue de la température de l'échantillon, de façon à pouvoir déterminer le point de congélation de l'échantillon par enregistrement de la modification de température. Un réservoir (13) sur un véhicule sert à recueillir l'échantillon de liquide depuis la surface de la route. Le système de refroidissement (10) et le système de réchauffement (11) sont reliés à un système de commande (14) afin de refroidir l'échantillon de façon répétée de l'état de liquide à l'état de glace et de le réchauffer de l'état de glace à l'état de liquide, ainsi que de mesurer en continu la température de l'échantillon, le réservoir (13) comportant également des moyens de distribution (15) servant à vider automatiquement ledit réservoir (13) lorsqu'on a fini de déterminer le point de congélation de l'échantillon.
PCT/SE1998/002144 1997-11-27 1998-11-27 Procede et dispositif servant a determiner le point de congelation Ceased WO1999031492A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15151/99A AU1515199A (en) 1997-11-27 1998-11-27 Method and device for determining the freezing point

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9704373-1 1997-11-27
SE9704373A SE511075C2 (sv) 1997-11-27 1997-11-27 Sätt och anordning vid fryspunktsmätning

Publications (1)

Publication Number Publication Date
WO1999031492A1 true WO1999031492A1 (fr) 1999-06-24

Family

ID=20409152

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/002144 Ceased WO1999031492A1 (fr) 1997-11-27 1998-11-27 Procede et dispositif servant a determiner le point de congelation

Country Status (3)

Country Link
AU (1) AU1515199A (fr)
SE (1) SE511075C2 (fr)
WO (1) WO1999031492A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6695469B2 (en) 2001-11-19 2004-02-24 Energy Absorption Systems, Inc. Roadway freezing point monitoring system and method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383770A (en) * 1981-07-09 1983-05-17 Boschung Mecatronic Ag Apparatus for determining the freezing point of a liquid on or from a road surface
EP0362173A1 (fr) * 1988-09-29 1990-04-04 Telub Teknik Ab Méthode pour mesurer une température avec un élément peltier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383770A (en) * 1981-07-09 1983-05-17 Boschung Mecatronic Ag Apparatus for determining the freezing point of a liquid on or from a road surface
EP0362173A1 (fr) * 1988-09-29 1990-04-04 Telub Teknik Ab Méthode pour mesurer une température avec un élément peltier
US5143451A (en) * 1988-09-29 1992-09-01 Affarsverket Ffv Method to measure a temperature with a peltier element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6695469B2 (en) 2001-11-19 2004-02-24 Energy Absorption Systems, Inc. Roadway freezing point monitoring system and method
US7090392B2 (en) 2001-11-19 2006-08-15 Energy Absorption Systems, Inc. Roadway freezing point monitoring system and method

Also Published As

Publication number Publication date
AU1515199A (en) 1999-07-05
SE511075C2 (sv) 1999-08-02
SE9704373D0 (sv) 1997-11-27
SE9704373L (sv) 1999-05-28

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