FR2611933A1 - Device for measuring eyepiece misting time - Google Patents

Device for measuring eyepiece misting time Download PDF

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Publication number
FR2611933A1
FR2611933A1 FR8702526A FR8702526A FR2611933A1 FR 2611933 A1 FR2611933 A1 FR 2611933A1 FR 8702526 A FR8702526 A FR 8702526A FR 8702526 A FR8702526 A FR 8702526A FR 2611933 A1 FR2611933 A1 FR 2611933A1
Authority
FR
France
Prior art keywords
time
misting
fogging
eyepiece
measuring
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.)
Withdrawn
Application number
FR8702526A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MOREZ LYCEE ENSEIGNEMENT TECHN
Original Assignee
MOREZ LYCEE ENSEIGNEMENT TECHN
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MOREZ LYCEE ENSEIGNEMENT TECHN filed Critical MOREZ LYCEE ENSEIGNEMENT TECHN
Priority to FR8702526A priority Critical patent/FR2611933A1/en
Publication of FR2611933A1 publication Critical patent/FR2611933A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties

Abstract

Device for measuring the 20 % misting time of any type of eyepiece, which supplements a previously constructed opto-mechanical apparatus. It comprises: - a hatch allowing synchronisation of time measurement and misting, - an electronic measuring device giving the 20 % misting time, either through a digital display, or through curves received on a plotter.

Description

La présente invention concerne un dispositif pour mesurer les temps d'embuage d'oculaires. The present invention relates to a device for measuring the fogging times of eyepieces.

Un appareillage optomécanique (schéma 1) ayant été réalisé pour vérifier la spécificité antibuée de tous types d'oculaires selon une norme préalablement définie, il s'est avéré utile de le compléter par un dispositif d'enregistrement automatique des mesures. An optomechanical device (diagram 1) having been produced to check the anti-fog specificity of all types of eyepieces according to a previously defined standard, it has proved useful to supplement it with an automatic measurement recording device.

Ce dispositif (A), situé à la sortie du récepteur photo-électrique est défini par le schéma 2 ; il mesure le temps à 20 % d'embuage d'un oculaire donné, soumis à un bain de vapeur d'eau saturée chauffée à 50 C. This device (A), located at the output of the photoelectric receiver is defined by diagram 2; it measures the time at 20% fogging of a given eyepiece, subjected to a bath of saturated steam heated to 50 C.

Une amélioration mécanique (B) du projet initial consiste en une trappe qui permet lors de son ouverture deux opérations simultanées et immédiates. A mechanical improvement (B) of the initial project consists of a hatch which allows two simultaneous and immediate operations when it is opened.

- La réception par le capteur d'un flux lumineux qui déclenche le système électronique de mesure du temps à 20 % d'embuage de l'échantillon. - The reception by the sensor of a luminous flux which triggers the electronic time measurement system at 20% fogging of the sample.

- L'échappement des vapeurs d'eau saturée qui déclenche le phénomène de buée. - The exhaust of saturated water vapors which triggers the fogging phenomenon.

Le capteur reçoit le flux lumineux ( ~ 16 % du flux laser initial) à l'instant oùla trappe s'ouvre. The sensor receives the light flux (~ 16% of the initial laser flux) the instant the hatch opens.

L'amplificateur de base transforme l'unité de mesure (lumen en volts) et amplifie le signal. The basic amplifier transforms the unit of measurement (lumen into volts) and amplifies the signal.

L'amplificateur avec entrée trigger décèle la présence de u dès que celui-ci atteint la tension de seuil u", il permet à l'amplificateur de changer d'état à sa sortie, ce qui entraine par l'intermédiaire
. de la bascule Rs qui attaque la logique, le déclenchement du
cycle de comptage, du monostable 1 le début d'ouverture d'échantillonage ; dès
la disparition de u il change d'état et permet par l'intermé
diaire du transistor la remise à zéro des capteurs afficheurs.The amplifier with trigger input detects the presence of u as soon as it reaches the threshold voltage u ", it allows the amplifier to change state at its output, which leads via
. of the Rs rocker which attacks the logic, the triggering of the
counting cycle, from monostable 1 to the start of sampling opening; from
the disappearance of u it changes state and allows through
diary of the transistor resetting the display sensors.

Le potentiomètre permet le réglage de u' (u'80 Z de u). The potentiometer allows the adjustment of u '(u'80 Z of u).

L'échantillonneur bloqueur laisse passer u' : u' entrée = u' sortie de t = 0 à t = 500 ms. A t = 500 ms, le monostable 2 coupe l'information, l'échantillonneur bloqueur mémorise u' : u' sortie = u' à t = 500 ms. The blocking sampler lets u 'pass: u' input = u 'output from t = 0 to t = 500 ms. At t = 500 ms, the monostable 2 cuts the information, the blocking sampler stores u ': u' output = u 'at t = 500 ms.

Le comparateur analyse les deux tensions qui lui sont fournies, lorsque u = u' il envoie l'information au monostable 1. The comparator analyzes the two voltages supplied to it, when u = u 'it sends the information to the monostable 1.

Le monostable 1 indique par une griffe le moment ou les deux courbes se coupent, il envoie instantannément une information sur la bascule Rs qui arrête le comptage.  The monostable 1 indicates by a claw the moment when the two curves intersect, it instantly sends information on the Rs flip-flop which stops the counting.

Le schéma 3 montre les courbes reçues sur table traçante - sans échantillon : les deux courbes sont rigoureusement para
llèles après t = 100 ms. A t = 500 ms U'max = 80 % u max,
l'écart entre les deux tensions est de 20 % qui correspond
aux 20 % d'embuage prévue par la norme.Diagram 3 shows the curves received on a plotter - without sample: the two curves are strictly para
These after t = 100 ms. At t = 500 ms U'max = 80% u max,
the difference between the two voltages is 20% which corresponds
to the 20% fogging provided for by the standard.

u = u' = u" déclenche le chronomètre. u = u '= u "starts the stopwatch.

- avec échantillon - t : arrêt du chronomètre : temps à 20 %
d'embuage de l'échantillon.- with sample - t: stopwatch: time at 20%
fogging of the sample.

A t = 500 ms, U1' = 80 % u1: mémorisation de la valeur de
u1, t #]500 ms ; t1[# f(u') = U1' At t = 500 ms, U1 '= 80% u1: storage of the value of
u1, t #] 500 ms; t1 [# f (u ') = U1'

Claims (1)

REVENDICATIONS Dispositif pour mesurer le temps d'embuage à 20 % de tous types d'oculaires, Device to measure the fogging time at 20% of all types of eyepieces, qui complète un appareillage opto-mécanique préalablement réali sé, which completes opto-mechanical equipment previously produced, qui comprend including - une trappe permettant de synchroniser mesure du temps et - a hatch to synchronize time measurement and embuage, fogging, - un dispositif électronique de mesure donnant le temps d'em - an electronic measuring device giving the em time buage à 20 , soit par un affichage numérique, soit par des jam at 20, either by a digital display or by courbes reçues sur table traçante.  curves received on plotter.
FR8702526A 1987-02-23 1987-02-23 Device for measuring eyepiece misting time Withdrawn FR2611933A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8702526A FR2611933A1 (en) 1987-02-23 1987-02-23 Device for measuring eyepiece misting time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8702526A FR2611933A1 (en) 1987-02-23 1987-02-23 Device for measuring eyepiece misting time

Publications (1)

Publication Number Publication Date
FR2611933A1 true FR2611933A1 (en) 1988-09-09

Family

ID=9348322

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8702526A Withdrawn FR2611933A1 (en) 1987-02-23 1987-02-23 Device for measuring eyepiece misting time

Country Status (1)

Country Link
FR (1) FR2611933A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2974904A1 (en) * 2011-05-04 2012-11-09 Essilor Int Method for determining anti-fog performance of transparent optical article i.e. ophthalmic lens, involves extracting data indicative of transition of light intensity as representative measure of sharpness of image of test pattern

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119630A2 (en) * 1983-03-21 1984-09-26 Donald W. Byers Method and apparatus for coating detection and surface evaluation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119630A2 (en) * 1983-03-21 1984-09-26 Donald W. Byers Method and apparatus for coating detection and surface evaluation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2974904A1 (en) * 2011-05-04 2012-11-09 Essilor Int Method for determining anti-fog performance of transparent optical article i.e. ophthalmic lens, involves extracting data indicative of transition of light intensity as representative measure of sharpness of image of test pattern

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