| 摘要 |
An improved nephelometer is disclosed comprising a cruciform housing having therein helical flow diverters for providing a helical water flow pattern so as to cleanse the inside of a sample tube. A regulated light beam is incident on the sample tube and sample. The transmitted portion of the light is measured and used in a feedback loop to control the incident bulb intensity and the scattered portion of the light is measured to provide a measure of the turbidity of the fluid under test. The housing of the nephelometer is a hermaphroditic molding of plastic so as to simplify construction and assembly. All parts mounted within the nephelometer are located by recesses molded into the two halves of the housing. Amplifier circuitry for the output of the scattered light detecting photosensor is disclosed, as is lamp regulator circuitry for feeding back the value of the transmitted light, so as to adjust the incident light, for ramping the bulb on and off and for keeping it in a low current condition.
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