Turbidimeter employing a semiconductor laser diode and a photodi

Details Turbidimeter employing a semiconductor laser diode and a photodi Turbidimeter employing a semiconductor laser diode and a photodi

1985-05-30

1988-02-16

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250205, 250573, 435291, G01N 2159, G01N 2184

Patent

active

047251484

ABSTRACT:
In a turbidimeter for measuring a turbidity of a test solution to be measured i.e. culture solution in a fermentation apparatus, a semiconductor laser diode and a semiconductor photodiode are integrally arranged in a detection portion of the turbidimeter in such a manner that a laser beam emitted from the semiconductor laser diode is made incident upon the semiconductor photodiode through the test solution. Moreover, a protection circuit for the semiconductor laser diode and the semiconductor photodiode is also arranged in the turbidimeter to cut off a current flowed therethrough when an environmental temperature becomes above a predetermined temperature. Therefore, the turbidimeter can be made small in size and light in weight, and the turbidity can be measured accurately over wide range.

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Marchand et al, "A High-Precision & Large-Capacity Laser Biophotometer", Applied Microbiology, May 1974, pp. 874-877.
Mackintosh et al, "Development and Further Applications of a Simple Turbidity Cell for Continuously Monitoring Bacterial Growth", Phys. Med. Biol., vol. 18, No. 2, pp. 265-271, Mar. 1973.

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