Prespot detection method and apparatus in an analyzer

Details Prespot detection method and apparatus in an analyzer Prespot detection method and apparatus in an analyzer

1990-01-24

1991-11-19

Lall, Parshotam S.

Boots, shoes, and leggings

364497, 436 46, G01N 3500, G01N 3318

Patent

active

050670921

ABSTRACT:
A method and apparatus for detecting an erroneous pre-spotting of liquid onto a test element in an analyzer. The invention utilizes a wetness detector and calculates the estimated second derivative of the R-C time decay curve produced by such a detector, to determine if a sudden increase in a slope exceeds more than a threshold value for two consecutive points. The threshold value is picked so as to exceed sudden increases that can be created by noise in the system.

REFERENCES:
patent: 4513438 (1985-04-01), Graham et al.
patent: 4523278 (1985-06-01), Reinhardt et al.
patent: 4702595 (1987-10-01), Mutschler et al.
patent: 4852025 (1989-07-01), Herpichbohm
patent: 4959796 (1990-09-01), Hidaka et al.

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