JPS56122940A - Method and apparatus for detecting melting time point - Google Patents

Method and apparatus for detecting melting time point

Info

Publication number
JPS56122940A
JPS56122940A JP2748380A JP2748380A JPS56122940A JP S56122940 A JPS56122940 A JP S56122940A JP 2748380 A JP2748380 A JP 2748380A JP 2748380 A JP2748380 A JP 2748380A JP S56122940 A JPS56122940 A JP S56122940A
Authority
JP
Japan
Prior art keywords
detecting
point
temperature
output
detector
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.)
Pending
Application number
JP2748380A
Other languages
Japanese (ja)
Inventor
Keigo Hoshikawa
Hiroshi Hirata
Kazuo Hiura
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.)
Nippon Telegraph and Telephone Corp
Kokusai Electric Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Kokusai Electric Corp
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 Nippon Telegraph and Telephone Corp, Kokusai Electric Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP2748380A priority Critical patent/JPS56122940A/en
Publication of JPS56122940A publication Critical patent/JPS56122940A/en
Pending 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

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)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Testing Or Measuring Of Semiconductors Or The Like (AREA)

Abstract

PURPOSE:To enable to easily perform an accurate detection by moving detecting point of surface temperature detector by infrared rays on the surface of contents in the crucible and detecting a point of time when the difference of temperature of the surface due to the presence of unmolten material is eliminated. CONSTITUTION:Detecting point of the surface temperature detector 3 by infrared rays is moved on the surface of the contents 2 in the crucible 1 and perfect melting time point is determined by time having no difference in the temperature of surface due to the presence of the unmolten material 2b. For example, the crucible 1 is rotated centering around the vertical axis 1' and the temperature of surface of the contents 2 is monitored in one circumference of a circle. Then, the output of the detector 3 and that of the holding circuit 5 holding a mean output in detecting time partitioned by the timing circuit 4 of the output of the detector 3, are compared by the comparator 6 and a decision output is outputted as the perfect melting time point when there is no difference between both outputs.
JP2748380A 1980-03-04 1980-03-04 Method and apparatus for detecting melting time point Pending JPS56122940A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2748380A JPS56122940A (en) 1980-03-04 1980-03-04 Method and apparatus for detecting melting time point

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2748380A JPS56122940A (en) 1980-03-04 1980-03-04 Method and apparatus for detecting melting time point

Publications (1)

Publication Number Publication Date
JPS56122940A true JPS56122940A (en) 1981-09-26

Family

ID=12222370

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2748380A Pending JPS56122940A (en) 1980-03-04 1980-03-04 Method and apparatus for detecting melting time point

Country Status (1)

Country Link
JP (1) JPS56122940A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04325488A (en) * 1991-04-26 1992-11-13 Mitsubishi Materials Corp Method for controlling liquid surface temperature
JP2018150219A (en) * 2017-03-13 2018-09-27 Ｆｔｂ研究所株式会社 Apparatus and method for growing large diameter cz single crystal
GB2606141A (en) * 2021-04-22 2022-11-02 Stratasys Powder Production Ltd Improved method, controller and apparatus for determining the onset of melting of a material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04325488A (en) * 1991-04-26 1992-11-13 Mitsubishi Materials Corp Method for controlling liquid surface temperature
JP2018150219A (en) * 2017-03-13 2018-09-27 Ｆｔｂ研究所株式会社 Apparatus and method for growing large diameter cz single crystal
GB2606141A (en) * 2021-04-22 2022-11-02 Stratasys Powder Production Ltd Improved method, controller and apparatus for determining the onset of melting of a material
GB2606141B (en) * 2021-04-22 2023-10-25 Stratasys Powder Production Ltd Improved method, controller and apparatus for determining the onset of melting of a material

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