JPS568530A - Turbidity measuring circuit - Google Patents
Turbidity measuring circuitInfo
- Publication number
- JPS568530A JPS568530A JP8432579A JP8432579A JPS568530A JP S568530 A JPS568530 A JP S568530A JP 8432579 A JP8432579 A JP 8432579A JP 8432579 A JP8432579 A JP 8432579A JP S568530 A JPS568530 A JP S568530A
- Authority
- JP
- Japan
- Prior art keywords
- output
- comparator
- voltage
- level
- turbidity
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity
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 Analysing Materials By Optical Means (AREA)
Abstract
PURPOSE:To realize the application of the photodetector in the optimum range and also ensure the working over a wide range of measurement without giving the range switching, by securing the continuous variation for the luminous intensity of the light source in accordance with the output of the photodetector. CONSTITUTION:With increase of the turbidity of sample 1, the illumination, i.e., the optical current of phototransistor Q2 decreases along with increase of voltage U4. As voltage U4 is applied to the inverse input of comparator 4, the output level of comparator 4 lowers down. Accordingly, the current which is supplied to LEDQ1 through Q3 increases, and thus the luminous intensity increases. When the output of comparator 4 lowers less than the set value, Zener diode D2 conducts with the base bias of Q3 held at the level of the output of comparator 4. And the current supplied to Q1 becomes constant regardless of the level of voltage U4. Comparator 5 generates the output corresponding to the difference of voltage U1 and U2 generated at resistance R4 and R6 each. And this output turns to the output signal OUT showing the turbidity of sample 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8432579A JPS568530A (en) | 1979-07-02 | 1979-07-02 | Turbidity measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8432579A JPS568530A (en) | 1979-07-02 | 1979-07-02 | Turbidity measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS568530A true JPS568530A (en) | 1981-01-28 |
Family
ID=13827354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8432579A Pending JPS568530A (en) | 1979-07-02 | 1979-07-02 | Turbidity measuring circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS568530A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62254090A (en) * | 1986-04-26 | 1987-11-05 | Toyo Commun Equip Co Ltd | Level matching for sensor |
-
1979
- 1979-07-02 JP JP8432579A patent/JPS568530A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62254090A (en) * | 1986-04-26 | 1987-11-05 | Toyo Commun Equip Co Ltd | Level matching for sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FR2571148B1 (en) | PHOTODIODE LIGHT BEAM DETECTOR WITH OPERATING POINT ADJUSTMENT CIRCUIT | |
| CA1123064A (en) | Optically coupled field effect transistor switch | |
| JPS568530A (en) | Turbidity measuring circuit | |
| GB1535824A (en) | Avalanche photodetector biassing system | |
| JPS55124003A (en) | Reflection type photoelectric switch | |
| RU2000023C1 (en) | Optical contactless level gauge | |
| JPS56157872A (en) | Light-applying voltage and electric field sensor | |
| ATE61501T1 (en) | DEVICE FOR PULSE CONTROL OF OPTOCOUPLERS. | |
| JPS5565110A (en) | Distance meter | |
| SU715944A1 (en) | Photoelectronic device | |
| JPS57119311A (en) | Compensating circuit for signal detector | |
| SU941439A1 (en) | Sensor for measuring linear density of fibrous material | |
| RU1780183C (en) | Optoelectronic switch | |
| JPS5799035A (en) | Two-wire type electronic switch | |
| SU655908A1 (en) | Temperature and illumination measuring device | |
| JPS5660357A (en) | Voltage detecting circuit | |
| JPS6484122A (en) | Photometric device | |
| JPS56154632A (en) | Photoelectric conversion circuit | |
| JPS55128161A (en) | Photoelectric voltage measuring apparatus | |
| JPS5676666A (en) | Detection circuit for call-out signal | |
| JPS5714862A (en) | Light beam scanning type electrophotographic device | |
| RU2007695C1 (en) | Method of measuring light intensity | |
| SU1108412A1 (en) | D.c. voltage stabilizer | |
| JPS6425010A (en) | Encoder | |
| JPS5762659A (en) | Detecting device for degradation of light source of facsimile |