Abstract:
PROBLEM TO BE SOLVED: To continuously measure the quantity of light having an intensity from a high intensity to a low intensity, at a high speed. SOLUTION: This photo detector is provided with an operational amplifier 1, a photodiode 2 which is connected to the inverting input terminal of the operational amplifier 1, and outputs a signal corresponding to the quantity of light to be detected, two or more feedback resistors whose resistance values are different from one another, and an analog switch 3 which connects each input terminal to which each one terminal of feedback resistors RS1-RSn-1 other than a feedback resistor RSn having the maximum resistance value, among these feedback resistors RS1-RSn, is connected respectively or an input terminal which is made into a non-connected state, in place of one terminal of the feedback resistor RSn, having the maximum resistance value to the output terminal of the operational amplifier 1 selectively. One terminal of the feedback resistor RSn, having the maximum resistance value, is connected to the output terminal of the operational amplifier 1, and in addition, the other ends of the other feedback resistors RS1-RSn-1 are connected to the inverting input terminal of the operational amplifier 1. COPYRIGHT: (C)2004,JPO
Abstract:
An aquarium photometer system includes a housing unit, an arm, and a mirror. The housing unit includes a light sensor configured to sense light incident on the light sensor and to convert the incident light to a signal. The housing unit also includes an operational amplifier including a first input node, a second input node, and an output node. The operational amplifier is configured to: receive the signal at the first input node, amplify a difference between the signal at the first input node and a signal at the second input node by a gain factor, and output the amplified signal on the output node. The housing unit also includes a potentiometer connected to the operational amplifier and configured to regulate the amplified signal; and a display connected to the potentiometer and configured to show an intensity of light detected by the light sensor based on the regulated amplified signal. The arm at a first end is connected to the housing unit and configured to move the housing unit around an aquarium case. The mirror is located on a bar and positioned within the aquarium in front of the light sensor and at a focal distance from the light sensor and configured to increase an amount of light incident on the light sensor.
Abstract:
Die Erfindung betrifft ein Verfahren zur Verbesserung des Dynamikbereichs einer Vorrichtung zum Detektieren von Licht, vorzugsweise zur Anwendung in einem Mikroskop, mitmindestens zwei Detektionsbereichen (8, 9), wobei die Detektionsbereiche (8, 9) jeweils aus einer Anordnung (Array) (8, 9) aus mehreren Single-Photon-Avalanche-Dioden (SPAD) gebildet werden und wobei die Detektionsbereiche (8, 9) jeweils zumindest einen Signal- Ausgang (10, 11) aufweisen, wobei für jeden der Detektionsbereiche (8, 9) eine Kennkurve (12, 13) ermittelt wird und wobei die Kennkurven (12, 13) zum Erhalt einer Korrekturkurve (15) und/oder eines Korrekturfaktors (17) miteinander kombiniert und/oder verrechnet werden. Des Weiteren betrifft die Erfindung eine Vorrichtung zum Detektieren von Licht, insbesondere zur Anwendung in einem Mikroskop. Ferner betrifft die Erfindung ein entsprechendes Mikroskop.
Abstract:
L'invention concerne un récepteur d'un signal lumineux impulsionnel qui comprend : - une photodiode (1) apte à générer un courant électrique (I D ) en réponse à ce signal lumineux, ayant comme caractéristique une capacité C d , - une masse électrique, - un amplificateur transimpédance (2) relié en entrée de la photodiode par une capacité de liaison C liaison . Il comporte un plot d'atténuation (30) situé entre la photodiode et l'amplificateur transimpédance, constitué d'une capacité C p avec C p =C d /(α-1 ), a étant une atténuation prédéterminée avec a >1.