FR2454612A1 - Indicateur de luminosite d'ambiance nocturne - Google Patents
Indicateur de luminosite d'ambiance nocturneInfo
- Publication number
- FR2454612A1 FR2454612A1 FR7910569A FR7910569A FR2454612A1 FR 2454612 A1 FR2454612 A1 FR 2454612A1 FR 7910569 A FR7910569 A FR 7910569A FR 7910569 A FR7910569 A FR 7910569A FR 2454612 A1 FR2454612 A1 FR 2454612A1
- Authority
- FR
- France
- Prior art keywords
- light
- logic circuit
- controlling operation
- meter
- measuring ambient
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
INDICATEUR DE LUMINOSITE D'AMBIANCE NOCTURNE PORTATIF PERMETTANT DE DEFINIR PAR SIMPLE LECTURE LE DEGRE D'ECLAIREMENT D'UN LIEU OU D'UN ESPACE PLONGE DANS L'OBSCURITE. DE CONCEPTION SIMPLE, IL COMPREND: UN ENSEMBLE DETECTEUR 4 A PHOTODIODE, OU A PHOTOTRANSISTOR OU A PHOTORESISTANCE SUIVANT LA SENSIBILITE DESIREE; UN ENSEMBLE AMPLIFICATEUR 5 A GAIN REGLABLE; UN ENSEMBLE DE COMPARATEURS 6 A SEUIL REGLABLE; UN AFFICHEUR DE NIVEAU 8 COMMANDE PAR UNE LOGIQUE DE COMMANDE A CIRCUITS INTEGRES7; UNE ALIMENTATION 2 PAR PILE OU BATTERIE D'ACCUMULATEUR; UN POUSSOIR 3; UN BOITIER 1 RENFERMANT L'ENSEMBLE CI-DESSUS. L'INVENTION PEUT ETRE UTILISEE EN PHOTOMETRIE (LABORATOIRES SCIENTIFIQUES, PHOTOGRAPHIES NOCTURNES), COMME DISPOSITIF DE DETECTION POUVANT ALIMENTER PAR EXEMPLE UNE ALARME DE DETECTION D'INCENDIE, UN DISPOSITIF ANTIVOL, EN AGRICULTURE COMME DISPOSITIF COMPLEMENTAIRE DE DETECTION DES GELEES RADIANTES.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7910569A FR2454612A1 (fr) | 1979-04-18 | 1979-04-18 | Indicateur de luminosite d'ambiance nocturne |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7910569A FR2454612A1 (fr) | 1979-04-18 | 1979-04-18 | Indicateur de luminosite d'ambiance nocturne |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2454612A1 true FR2454612A1 (fr) | 1980-11-14 |
FR2454612B1 FR2454612B1 (fr) | 1982-10-29 |
Family
ID=9224755
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7910569A Granted FR2454612A1 (fr) | 1979-04-18 | 1979-04-18 | Indicateur de luminosite d'ambiance nocturne |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2454612A1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3737240A (en) * | 1970-12-24 | 1973-06-05 | Agfa Gevaert Ag | Exposure indicator in a photographic camera |
US3845360A (en) * | 1972-03-30 | 1974-10-29 | Asahi Optical Co Ltd | Light-measuring circuits |
US3895876A (en) * | 1972-09-07 | 1975-07-22 | Asahi Optical Co Ltd | Quantized indication apparatus |
FR2333227A1 (fr) * | 1975-11-25 | 1977-06-24 | Asahi Optical Co Ltd | Convertisseur analogique-numerique pour l'affichage numerique d'exposition photographique |
-
1979
- 1979-04-18 FR FR7910569A patent/FR2454612A1/fr active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3737240A (en) * | 1970-12-24 | 1973-06-05 | Agfa Gevaert Ag | Exposure indicator in a photographic camera |
US3845360A (en) * | 1972-03-30 | 1974-10-29 | Asahi Optical Co Ltd | Light-measuring circuits |
US3895876A (en) * | 1972-09-07 | 1975-07-22 | Asahi Optical Co Ltd | Quantized indication apparatus |
FR2333227A1 (fr) * | 1975-11-25 | 1977-06-24 | Asahi Optical Co Ltd | Convertisseur analogique-numerique pour l'affichage numerique d'exposition photographique |
Also Published As
Publication number | Publication date |
---|---|
FR2454612B1 (fr) | 1982-10-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |