Portable photometer

US4003662A · kind A · utility

Assignee

• Compur-Electronic GmbH · DE

Inventors

• Erich Retzer · Maisach, DE
• Otto Holzinger · Eschenbach, DE
• Wilhelm Pross

Key dates

• Filing date: May 21, 1975
• Grant date: Jan 18, 1977
• Expiry date: May 21, 1995

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/251
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A photometer for measuring the light permeability of a material for testing is made portable for hand-held operation outside a laboratory for measurements such as determining the proportion of hemoglobin in human blood. It includes a battery power supply that energizes a lamp, an opening for receiving a cuvet for a measurement, and a measuring circuit having a light-sensitive element. An indicator instrument in the measuring circuit indicates zero compensation, and a manually movable wedge filter is in the path of the light beam for adjusting the light passing through the cuvet. A manually operable element effects a zero compensation of the measuring circuit before a test is made, and a viewable scale on a setting member carrying the wedge filter directly displays a test result value from adjustment of the wedge filter during measurement of the material.