SYSTEME D'ALARME POUR LES RAYONS SOLAIRES ULTRAVIOLETS CAUSANT DES MALADIES DE LA PEAU

ALARM SYSTEM FOR SOLAR ULTRAVIOLET CAUSING SKIN DISEASES (ASSUV)

Abrégé anglais

Alarm System for Solar UltraViolet
Causing Skin Diseases(ASSUV)
Abstract
Because of the holes in the Ozonosphere near polars of
the earth, skin diseases caused by solar ultraviolet, such
as cancer, are becoming big threats to sun-bathers. This
invention is made to let sun-bathers enjoy sun shine without
worry. It is a device which calculates how much solar
ultraviolet one has already received, and gives alarm when
too much solar ultraviolet in a certain period has been
received.

Revendications

The embodiments of the invention in which an exclusive
property or privilege is claimed are defined as follows:
1 An alarm system which gives solar ultraviolet
accumulation alarm, and is used for prevention of skin
diseases, such as skin cancer, caused by receiving too much
solar ultraviolet.
2 A system configuration shown in Figure 1.
3 A short band solar-UV receiving circuit consists of
R1 , R2, R3, Phototransistor, Zener Diode, Filter and OP1, as
shown in Figure 2, which is specifically designed for the
solar UV spectrum ranging from 300 nm to 400 nm.
4 A configuration of solar-UV accumulation circuit
consists of the following parts: (1) a stable voltage supply
and a power indication for the accurate sensing and
triggering, consist of R1, Zener Diode, R7, R8, LED, ST3 and
ST4; (2) a low output impedance solar-UV sensing, consists of
R2, R8, Phototransistor and OP1; (3) an integrator circuit
consists of a phase invertor, an inverse phase integrator and
a discharge switch. In Figure 2, this circuit consists of R4,
R5, OP1, R6, C, OP2 and Switch; (4) a Triggering circuit
consists of R9, ST and ST2; (5) a power amplifier consists of
OP1, R10 and R11; (6) an alarm and memory.
5 The alarm system in claim 1, claim 2 accumulates solar
UV for 20 minitutes to 5 hours in day sun light.

Description

Specification
This invention relates to the alarm system for detecting
the Solar UltraViolet ~referred to as Solar-UV hereafter)
and its accumulation which are harmful to human skin and may
cause skin diseases such as skin cancer.
It has been proved medically that the solar-UV light can
lead to various skin diseases, especially skin cancer. The
induction of these skin diseases (including skin cancer) is
caused by the accumulation of the solar-UV light everyday.
When the accumulation of solar-UV increases up to a certain
value, the skin diseases may take place. This invention is
intended to warn the accumulation of the solar-UV light on
the userY' skins. When the users are working in the sun
or/and taking the sun bath, or/and enjoying the sunshine
lying on beaches, users' yards, gardens, they take this
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1nvented device (ASSUV) to -test the accumulation of -the
solar-UV light, ASSUV will alarm the users not -to be in the
sun con-tinuously any more to avoid causing skln diseases.
This invention is a creative and intensive idea which
combines the receiving of -the solar-UV light, solar-UV
calculating, memorizing, accumula-ting and alarming and
indicating toge-ther. Although there are ultraviolet
detectors used in the condition of high tempera-ture ovens to
detec-t the ul-traviolet light and pro-tect the health of
workers who are working in -this surroundings, there is no
commercial alarm system for protecting the human skins and
health in -the solar-UV light.
This ASSUV iS very easy to use. When the users are in
the sun light, switch on the ASSUV, the skins of users and
the ASSUV simultaneously feel the solar-UV light. When the
accumula-tion of the solar-UV 1ight increases to a value
harmful to human skins and may cause skin diseases
(including skin cancer), The ASSUV alarms the users to stop
taking the sun bath today, and the ASSUV can record the
total accumulation of the solar-UV light and tell the users
not to be in the strong solar light -too long.
This invention is to detect and accumulate the strength
of the solar-UV light, rather -than other lights. Fig.1 shows
the block diagram of working process of the ASSUV. Fig.2
gives the ~hematic circuit of the A~SUV.
Figure 1 shows the six stages of the ASSUV. In the first
stage, the solar-UV is being detected by a narrow band
solar-UV sensor circuit with a spectral range of 300 to 400
nm. This stage transforms the solar-UV strength into a
voltage signal. The second stage uses a high input impedance
circuit to isolate -the first stage from the other circuit,

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and gives a low output impedance to provide enough power to
drive the following circuit. The third stage of -the ASSUV is
an integration circuit which accumulates the solar-UV
strength along -the time. This accumulation is used as the
input signal to Schmitt trig~ers which is the four~h stage
of the ASSUV. The output slgnal of the trigger is amplified
and used to drive an alarm and a memory which is the final
stage of the ASSUV.
In Figure 2, Rl and the Zener Diode provide a stable
voltage source for the solar-UV sensing and the Schmitt
triggers, which is critical for the accurate sensing and
triggering. The phototransistor and R2 transform -the solar-
UV strength into a voltage signal. A high input impedance
isolator consisting of Pl and R~, isolates the solar-UV
sensing ircuit from the other circuit and passes on the
solar-UV strength signal to a phase inver-tor which consists
of OP2, ~ and Rs~ An inverse phase integrator consisting of
OP3, ~ and C accumulates the solar-UV strength signal. Rg
passes on this integral signal to two Schmitt triggers STI
and ST2 cascaded together. When the solar-UV strength is
accumulated to a pre-set level (adjustable by adjusting Rs)~
the first trigger STI gives a low voltage signal to the
second trigger ST 2 and S~ outputs a high voltage signal.
This high voltage signal is power amplified by OP4, ~0 and
~1~ and is used to drive an alarm and a memory. A power
indicator consists of R7, ~, LED, ST3 and ST4. When a user
turns on the ASSUV, the LED lights up indicating the
beginning of the solar-UV accumulation, if the LED does not
light up, it means that the batteries have no enough power
to let the whole circuit work accurately, and should be
replaced. The power switch is configured such that when the
ASSUV is turned off, the capacitor C is discharged
immediately.

Dessin représentatif