JPS54123073A - Sensitivity adjusting method and device for laser flow meter - Google Patents

Sensitivity adjusting method and device for laser flow meter

Info

Publication number
JPS54123073A
JPS54123073A JP2997478A JP2997478A JPS54123073A JP S54123073 A JPS54123073 A JP S54123073A JP 2997478 A JP2997478 A JP 2997478A JP 2997478 A JP2997478 A JP 2997478A JP S54123073 A JPS54123073 A JP S54123073A
Authority
JP
Japan
Prior art keywords
output
sensitivity
flow meter
power source
voltage
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
JP2997478A
Other languages
Japanese (ja)
Inventor
Koji Nakagawa
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2997478A priority Critical patent/JPS54123073A/en
Publication of JPS54123073A publication Critical patent/JPS54123073A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/50—Systems of measurement based on relative movement of target
    • G01S17/58—Velocity or trajectory determination systems; Sense-of-movement determination systems

Abstract

PURPOSE:To simplify the handling and shorten the metering time of a flow meter by automatically controlling the sensitivity of a photoelectric converter and the intensity of a laser beam while using the output signals of the element as the feedback element. CONSTITUTION:When the output voltage of a high voltage power source 14 becomes excessively low, the sensitivity of a photoelectron multiplier 12. As a result, the output pulses of discriminators 17 and 18 are reduced so that no output is generated in a pulse counting unit 19. Since a step voltage generating unit 21 receives the output of the counting unit 19 to generate positive step voltage, the power source 14 receives this to raise the output voltage. A series of these operations are repeated at the preset period of the pulse counting unit the sensitivity of the mutiplier 12 is increased to make the output level and frequency sufficient. If the output voltage of the power source 14 is excessive, the opposite operations to the above are so accomplished that the sensitivity of the multiplier 12 can be always held at a desired level. Thus, it is possible to simplify the handling of a flow meter and to shorten the measuring time.
JP2997478A 1978-03-17 1978-03-17 Sensitivity adjusting method and device for laser flow meter Pending JPS54123073A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2997478A JPS54123073A (en) 1978-03-17 1978-03-17 Sensitivity adjusting method and device for laser flow meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2997478A JPS54123073A (en) 1978-03-17 1978-03-17 Sensitivity adjusting method and device for laser flow meter

Publications (1)

Publication Number Publication Date
JPS54123073A true JPS54123073A (en) 1979-09-25

Family

ID=12290921

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2997478A Pending JPS54123073A (en) 1978-03-17 1978-03-17 Sensitivity adjusting method and device for laser flow meter

Country Status (1)

Country Link
JP (1) JPS54123073A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63149567A (en) * 1986-12-12 1988-06-22 Intaadetsuku:Kk Optical measuring method in physical property change
JP2014079259A (en) * 2000-05-09 2014-05-08 Xy Llc High purity x-chromosome bearing populations of spermatozoa and y-chromosome bearing populations of spermatozoa

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63149567A (en) * 1986-12-12 1988-06-22 Intaadetsuku:Kk Optical measuring method in physical property change
JP2014079259A (en) * 2000-05-09 2014-05-08 Xy Llc High purity x-chromosome bearing populations of spermatozoa and y-chromosome bearing populations of spermatozoa
US10208345B2 (en) 2000-05-09 2019-02-19 Xy, Llc Method for producing high purity X-chromosome bearing and Y-chromosome bearing populations of spermatozoa

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